Built-in detection rules

Sekoia.io provides built-in detection rules to illuminate intrusions, adversarial behaviours and suspicious activity escalation chains so you can immediately take steps to remediate. Built-in rules can be customized to your context and according to your security posture.

Please check the dedicated FAQ page related to detection rule strategy.

For Windows-related rules, Sekoia.io automatically produces this regularly updated list of the needed EventIDs by rule but also globally as some statistics are provided.

Rules catalog includes 986 built-in detection rules (last update on 2024-12-17).

Reconnaissance

Gather Victim Identity Information

Anomaly Possible Sysvol Dump

The rule detects abnormally high access to sysvol files.

• Effort: master

• Changelog:

  • 08/04/2024 - minor - change field name on query
  • 13/06/2024 - minor - Adding fields to be displayed in alerts.

Gather Victim Network Information

ACLight Discovering Privileged Accounts

Detects use of ACLight tool. This tool aims to discover privileged accounts by scanning the network.

• Effort: advanced

Adidnsdump Enumeration

Detects use of the tool adidnsdump for enumeration and discovering DNS records.

• Effort: advanced

Gatewatcher AionIQ V103 Network Behavior Analytics

Detects when network behavior analytics were requested.

• Effort: master

Internet Scanner

Detects known scanner IP addresses. Alert is only raised when the scan hits an opened port, on TCP or UDP. This could be a very noisy rule, so be careful to check your detection perimeter before activation.

• Effort: master

• Changelog:

  • 28/04/2023 - minor - Support for standard ECS FW fields

Internet Scanner Target

Detects known scanner IP addresses. Alert is only raised when the scan hits an opened port, on TCP or UDP and group by target address. This could be a very noisy rule, so be careful to check your detection perimeter before activation.

• Effort: master

• Changelog:

  • 28/04/2023 - minor - Support for standard ECS FW fields

Microsoft Windows Active Directory Module Commandlets

Detects use of commandlets linked to the AD Module.

• Effort: advanced

Remote System Discovery Via Telnet

Detects use of the protocol telnet to access information.

• Effort: advanced

System Network Connections Discovery

Detects system network connections discovery via powershell and cmd.

• Effort: advanced

Gather Victim Host Information

DNS Query For Iplookup

Detects dns query of observables tagged as iplookup.

• Effort: master

Wmic Suspicious Commands

Detects suspicious commands used by the process wmic to get informations on the system.

• Effort: advanced

Active Scanning

Anomaly Fortigate IPS Alert Peak

The rule detects abnormally high number of Fortigate IPS alert

• Effort: master

Bitsight SPM Material Vulnerability

Bitsight SPM has raised a material vulnerability finding

• Effort: master

Bitsight SPM Minor Vulnerability

Bitsight SPM has raised a minor vulnerability finding

• Effort: master

Bitsight SPM Moderate Vulnerability

Bitsight SPM has raised a moderate vulnerability finding

• Effort: master

Bitsight SPM Severe Vulnerability

Bitsight SPM has raised a severe vulnerability finding

• Effort: master

Burp Suite Tool Detected

Burp Suite is a cybersecurity tool. When used as a proxy service, its purpose is to intercept packets and modify them to send them to the server. Burp Collaborator is a network service that Burp Suite uses to help discover many kinds of vulnerabilities (vulnerabilities scanner).

• Effort: intermediate

Cloudflare HTTP Requests Rule Block Or Drop

Detects when one of Cloudflare Web Application Firewall (WAF) Managed rule blocked or dropped an HTTP request. It requires only Cloudflare HTTP requests logs.

• Effort: master

Cloudflare WAF Correlation Alerts

Detection of multiple alerts (more than 5) triggered by the same source by Cloudflare detection rules

• Effort: master

• Changelog:

  • 28/03/2024 - minor - Rule effort was updated to master

Correlation Fortigate Multi Alert From One Internal Ip

This rule detect an internal asset that targets a destination IP address with several threat

• Effort: master

Correlation Fortigate Multi Dest From One Internal Ip

This rule detect an internal asset that targets several destination IP address with the same threat

• Effort: master

ExtraHop Reveal(x) 360 Intrusion Detection Critical Severity

ExtraHop Reveal(x) 360 raised an intrusion detection alert with critical severity.

• Effort: master

ExtraHop Reveal(x) 360 Intrusion Detection High Severity

ExtraHop Reveal(x) 360 raised an intrusion detection alert with high severity.

• Effort: master

Fastly Next-Gen WAF Audit Threat Alert

Forward a threat detection made by Fastly Next-Gen WAF Audit Logs

• Effort: master

Fortigate IPS Critical Alert

Fortigate intrusion detection alert with critical severity.

• Effort: master

Fortigate IPS High Severity Alert

Fortigate intrusion detection alert with high severity.

• Effort: master

Internet Scanner

Detects known scanner IP addresses. Alert is only raised when the scan hits an opened port, on TCP or UDP. This could be a very noisy rule, so be careful to check your detection perimeter before activation.

• Effort: master

• Changelog:

  • 28/04/2023 - minor - Support for standard ECS FW fields

Internet Scanner Target

Detects known scanner IP addresses. Alert is only raised when the scan hits an opened port, on TCP or UDP and group by target address. This could be a very noisy rule, so be careful to check your detection perimeter before activation.

• Effort: master

• Changelog:

  • 28/04/2023 - minor - Support for standard ECS FW fields

Veeam Backup & Replication Malware Detection

Veeam Backup & Replication has detected some malware related activity

• Effort: master

• Changelog:

  • 13/08/2024 - major - Restrict to only one type of event following customer feedback

WAF Block Rule

Detects when one of WAF rule blocked an HTTP request

• Effort: master

• Changelog:

  • 15/11/2023 - minor - Adding support for Ubika

WAF Correlation Block Multiple Destinations

Detection of multiple block actions (more than 10) by the Web Application Firewall (WAF) triggered by the same source to mutliple destinations

• Effort: master

• Changelog:

  • 28/03/2024 - minor - Rule effort was updated to master

WAF Correlation Block actions

Detection of multiple block actions (more than 30) triggered by the same source by WAF detection rules

• Effort: master

• Changelog:

  • 28/03/2024 - minor - Rule effort was updated to master

Phishing for Information

Gatewatcher AionIQ V103 Active CTI

Detects whan an event related to CTI is raised by Gatewatcher V103. An attacker may be gathering information with this event.

• Effort: master

Gatewatcher AionIQ V103 Retrohunt

Detects when a retrohunt event is raised by GatewatcherV103.

• Effort: master

Resource Development

Acquire Infrastructure

Login Brute-Force Successful On ArubaOS Switch

A user has attempted to login several times (brute-force) on ArubaOS switch and succeeded to login.

• Effort: advanced

Login Brute-Force Successful On AzureAD From Single IP Address

A user has attempted to login several times (brute-force) on AzureAD and succeeded to login, all from the same source IP address and in a timerange of 5 minutes.

• Effort: advanced

• Changelog:

  • 23/03/2023 - minor - The error code 50076 has been excluded as it is not a specific error code related to a login failure that we want to detect and caused several false positives.
  • 16/08/2024 - minor - The error code 50078 has been excluded as it is not a specific error code related to a login failure that we want to detect and caused several false positives.
  • 14/10/2024 - minor - The error codes 70043, 50173, 70008, 700082, 9002341 have been excluded as they are not related to login failures that we want to detect and caused several false positives.
  • 28/11/2024 - minor - Adding error codes as filters to reduce false positives.

Login Brute-Force Successful On Jumpcloud Portal

A user has attempted to login several times (brute-force) on Jumpcloud Portal and succeeded to login.

• Effort: advanced

Login Brute-Force Successful On Jumpcloud Workstation

A user has attempted to login several times (brute-force) on Jumpcloud monitored workstations (windows, linux, mac) and succeeded to login.

• Effort: advanced

Login Brute-Force Successful On Okta

A user has attempted to login several times (brute-force) on Okta and succeeded to login.

• Effort: advanced

Login Brute-Force Successful On Rubycat PROVE IT

A user has attempted to login several times (brute-force) through Rubycat PROVE IT protected devices and succeeded to login.

• Effort: advanced

Login Brute-Force Successful On WatchGuard Firebox

A user has attempted to login several times (brute-force) on WatchGuard Firebox and succeeded to login.

• Effort: advanced

Microsoft Entra ID (Azure AD) Abnormal Token

Detects when Microsoft Entra ID (Azure AD) indicates that there are abnormal characteristics in the token such as an unusual token lifetime or a token that is played from an unfamiliar location. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: intermediate

Microsoft Entra ID (Azure AD) Anonymous IP

Detects when Microsoft Entra ID (Azure AD) identifies sign-ins from a risky IP address, for example, using an anonymous browser or VPN. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: advanced

Microsoft Entra ID (Azure AD) Impossible Travel

Detects when Microsoft Entra ID (Azure AD) identifies two user activities (a single or multiple sessions) originating from geographically distant locations within a time period shorter than the time it would have taken the user to travel from the first location to the second. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: master

Microsoft Entra ID (Azure AD) Leaked Credentials

Detects when Microsoft Entra ID (Azure AD) identifies that the user's valid credentials have been leaked. This sharing is typically done by posting publicly on the dark web, paste sites, or by trading and selling the credentials on the black market. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: master

Microsoft Entra ID (Azure AD) Login Failed Brute-Force From Single IP Address

A user has attempted to login several times (brute-force) on AzureAD and failed every time, all from the same source IP address and in a timerange of 5 minutes.

• Effort: advanced

• Changelog:

  • 22/03/2024 - major - More precise list of error codes to reduce false positives.

Microsoft Entra ID (Azure AD) Malicious IP

Detects when Microsoft Entra ID (Azure AD) identifies a malicious IP address. An IP address is considered malicious based on high failure rates because of invalid credentials received from the IP address or other IP reputation sources. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: intermediate

• Changelog:

  • 16/07/2024 - minor - Change similarity strategy.

Microsoft Entra ID (Azure AD) Password Spray

Detects when Microsoft Entra ID (Azure AD) indicates that multiple usernames are attacked using common passwords in a unified brute force manner to gain unauthorized access. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: intermediate

Microsoft Entra ID (Azure AD) Sign-in From Unlikely Country

Detects when Microsoft Entra ID (Azure AD) identifies sign-ins originating from geographically distant locations, where at least one of the locations may also be atypical for the user, given past behavior. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: master

Microsoft Entra ID (Azure AD) Successful Password Spraying From Single IP Address

An IP address performed several failed logins on multiple users to then have a successful login on one of them. Note that even if the sign-in was blocked by MFA (error 50074/50076/50158) or conditional access (error 50097/53003), these verifications only occur after the correct password was submitted. The account's password must still be considered compromised, and be changed.

• Effort: advanced

• Changelog:

  • 22/03/2024 - major - More precise list of error codes for success and failure to reduce false positives.

Microsoft Entra ID (Azure AD) Suspicious Browser

Detects when Microsoft Entra ID (Azure AD) identifies suspicious sign-in activity across multiple tenants from different countries in the same browser. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: master

Microsoft Entra ID (Azure AD) Suspicious IP

Detects when Microsoft Entra ID (Azure AD) identifies a suspicious IP address. An IP address is considered suspicious based on high failure rates because of invalid credentials received from the IP address or other IP reputation sources. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: intermediate

Microsoft Entra ID (Azure AD) Suspicious Inbox Forwarding

Detects when Microsoft Entra ID (Azure AD) identifies suspicious email forwarding rules, for example, if a user created an inbox rule that forwards a copy of all emails to an external address. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: master

Microsoft Entra ID (Azure AD) Threat Intelligence

Detects when Microsoft Entra ID (Azure AD) identifies a sign-in activity that is unusual for the given user or is consistent with known attack patterns based on Microsoft's internal and external threat intelligence sources. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: intermediate

Microsoft Entra ID (Azure AD) Token Issuer Anomaly

Detects when Microsoft Entra ID (Azure AD) indicates that The SAML token issuer for the associated SAML token is potentially compromised. The claims included in the token are unusual or match known attacker patterns. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: advanced

Microsoft Entra ID (Azure AD) Unfamiliar Features

Detects when Microsoft Entra ID (Azure AD) identifies sign-ins with characteristics that deviate from past sign-in properties. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: intermediate

Okta MFA Brute-Force Successful

A user has attempted to login several times (brute-force) on Okta and succeeded to login by spamming MFA.

• Effort: advanced

Compromise Infrastructure

Login Brute-Force Successful On ArubaOS Switch

A user has attempted to login several times (brute-force) on ArubaOS switch and succeeded to login.

• Effort: advanced

Login Brute-Force Successful On AzureAD From Single IP Address

A user has attempted to login several times (brute-force) on AzureAD and succeeded to login, all from the same source IP address and in a timerange of 5 minutes.

• Effort: advanced

• Changelog:

  • 23/03/2023 - minor - The error code 50076 has been excluded as it is not a specific error code related to a login failure that we want to detect and caused several false positives.
  • 16/08/2024 - minor - The error code 50078 has been excluded as it is not a specific error code related to a login failure that we want to detect and caused several false positives.
  • 14/10/2024 - minor - The error codes 70043, 50173, 70008, 700082, 9002341 have been excluded as they are not related to login failures that we want to detect and caused several false positives.
  • 28/11/2024 - minor - Adding error codes as filters to reduce false positives.

Login Brute-Force Successful On Jumpcloud Portal

A user has attempted to login several times (brute-force) on Jumpcloud Portal and succeeded to login.

• Effort: advanced

Login Brute-Force Successful On Jumpcloud Workstation

A user has attempted to login several times (brute-force) on Jumpcloud monitored workstations (windows, linux, mac) and succeeded to login.

• Effort: advanced

Login Brute-Force Successful On Okta

A user has attempted to login several times (brute-force) on Okta and succeeded to login.

• Effort: advanced

Login Brute-Force Successful On Rubycat PROVE IT

A user has attempted to login several times (brute-force) through Rubycat PROVE IT protected devices and succeeded to login.

• Effort: advanced

Login Brute-Force Successful On WatchGuard Firebox

A user has attempted to login several times (brute-force) on WatchGuard Firebox and succeeded to login.

• Effort: advanced

Microsoft Entra ID (Azure AD) Abnormal Token

Detects when Microsoft Entra ID (Azure AD) indicates that there are abnormal characteristics in the token such as an unusual token lifetime or a token that is played from an unfamiliar location. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: intermediate

Microsoft Entra ID (Azure AD) Anonymous IP

Detects when Microsoft Entra ID (Azure AD) identifies sign-ins from a risky IP address, for example, using an anonymous browser or VPN. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: advanced

Microsoft Entra ID (Azure AD) Impossible Travel

Detects when Microsoft Entra ID (Azure AD) identifies two user activities (a single or multiple sessions) originating from geographically distant locations within a time period shorter than the time it would have taken the user to travel from the first location to the second. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: master

Microsoft Entra ID (Azure AD) Leaked Credentials

Detects when Microsoft Entra ID (Azure AD) identifies that the user's valid credentials have been leaked. This sharing is typically done by posting publicly on the dark web, paste sites, or by trading and selling the credentials on the black market. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: master

Microsoft Entra ID (Azure AD) Login Failed Brute-Force From Single IP Address

A user has attempted to login several times (brute-force) on AzureAD and failed every time, all from the same source IP address and in a timerange of 5 minutes.

• Effort: advanced

• Changelog:

  • 22/03/2024 - major - More precise list of error codes to reduce false positives.

Microsoft Entra ID (Azure AD) Malicious IP

Detects when Microsoft Entra ID (Azure AD) identifies a malicious IP address. An IP address is considered malicious based on high failure rates because of invalid credentials received from the IP address or other IP reputation sources. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: intermediate

• Changelog:

  • 16/07/2024 - minor - Change similarity strategy.

Microsoft Entra ID (Azure AD) Password Spray

Detects when Microsoft Entra ID (Azure AD) indicates that multiple usernames are attacked using common passwords in a unified brute force manner to gain unauthorized access. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: intermediate

Microsoft Entra ID (Azure AD) Sign-in From Unlikely Country

Detects when Microsoft Entra ID (Azure AD) identifies sign-ins originating from geographically distant locations, where at least one of the locations may also be atypical for the user, given past behavior. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: master

Microsoft Entra ID (Azure AD) Successful Password Spraying From Single IP Address

An IP address performed several failed logins on multiple users to then have a successful login on one of them. Note that even if the sign-in was blocked by MFA (error 50074/50076/50158) or conditional access (error 50097/53003), these verifications only occur after the correct password was submitted. The account's password must still be considered compromised, and be changed.

• Effort: advanced

• Changelog:

  • 22/03/2024 - major - More precise list of error codes for success and failure to reduce false positives.

Microsoft Entra ID (Azure AD) Suspicious Browser

Detects when Microsoft Entra ID (Azure AD) identifies suspicious sign-in activity across multiple tenants from different countries in the same browser. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: master

Microsoft Entra ID (Azure AD) Suspicious IP

Detects when Microsoft Entra ID (Azure AD) identifies a suspicious IP address. An IP address is considered suspicious based on high failure rates because of invalid credentials received from the IP address or other IP reputation sources. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: intermediate

Microsoft Entra ID (Azure AD) Suspicious Inbox Forwarding

Detects when Microsoft Entra ID (Azure AD) identifies suspicious email forwarding rules, for example, if a user created an inbox rule that forwards a copy of all emails to an external address. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: master

Microsoft Entra ID (Azure AD) Threat Intelligence

Detects when Microsoft Entra ID (Azure AD) identifies a sign-in activity that is unusual for the given user or is consistent with known attack patterns based on Microsoft's internal and external threat intelligence sources. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: intermediate

Microsoft Entra ID (Azure AD) Token Issuer Anomaly

Detects when Microsoft Entra ID (Azure AD) indicates that The SAML token issuer for the associated SAML token is potentially compromised. The claims included in the token are unusual or match known attacker patterns. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: advanced

Microsoft Entra ID (Azure AD) Unfamiliar Features

Detects when Microsoft Entra ID (Azure AD) identifies sign-ins with characteristics that deviate from past sign-in properties. To use this feature, you must have an Microsoft Entra ID (Azure AD) Premium P2 license (https://docs.microsoft.com/en-us/azure/active-directory/identity-protection/overview-identity-protection).

• Effort: intermediate

Okta MFA Brute-Force Successful

A user has attempted to login several times (brute-force) on Okta and succeeded to login by spamming MFA.

• Effort: advanced

Compromise Accounts

Cisco Identity Services Engine Configuration Changed

Cisco Identity Services Engine (ISE) has detected a device configuration changed (Added, Changed or Deleted). This should be reviewed in order to check if this an expected admin action.

• Effort: master

Correlation Jumpcloud User Logged In From Multiple Countries

Detection of login events from multiple countries on Jumpcloud portal.

• Effort: intermediate

Microsoft Defender for Office 365 High Severity AIR Alert

Microsoft Defender for Office 365 includes the capability to run Automated investigation and response (AIR) actions. This rule detects when a High severity alert triggers an automated investigation, such as when a potentially malicious URL click was detected, or when a user is restricted from sending email.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Microsoft Defender for Office 365 Medium Severity AIR Alert

Microsoft Defender for Office 365 includes the capability to run Automated investigation and response (AIR) actions. This rule detects when a Medium severity alert triggers an automated investigation, such as when suspicious email sending patterns are detected from an account.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Okta Reuse Device Token

Detection of the reusing of Device Token.

• Effort: intermediate

Okta User Logged In From Multiple Countries

Detection of login events from multiple countries.

• Effort: intermediate

Okta User Logged In Multiple Applications

Detection of login events on multiple application.

• Effort: intermediate

• Changelog:

  • 07/08/2023 - major - Switching type from event_count to value_count | Adding Target in order to match only on different Apps

Varonis Data Security Email Alert

Varonis Data Security has raised an alert related to a supervised email account.

• Effort: master

Varonis Data Security Network Alert

Varonis Data Security has raised an alert related to a network rule

• Effort: master

Obtain Capabilities

Cyberwatch Detection Critical Vulnerability

Cyberwatch Detection has detected an asset with a critical vulnerability

• Effort: master

ESET Protect Vulnerability Exploitation Attempt

Detects when an attempt is made to exploit a vulnerability.

• Effort: master

Elevated Shell Launched By Browser

Detects when openwith.exe is launched with privileges followed by a browser launching an elevated shell. Related to the CVE-2024-38014.

• Effort: master

Privilege Escalation Awesome Scripts (PEAS)

Detect PEAS privileges escalation scripts and binaries

• Effort: elementary

Initial Access

Valid Accounts

Account Added To A Security Enabled Group

Detection in order to investigate who has added a specific Domain User in Domain Admins or Group Policy Creator Owners (Security event 4728)

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed
  • 12/07/2024 - minor - add similarity strategy

Account Removed From A Security Enabled Group

Detection in order to investigate who has removed a specific Domain User in Domain Admins or Group Policy Creator Owners (Security event 4729)

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed
  • 12/07/2024 - minor - Add similarity strategy

Account Tampering - Suspicious Failed Logon Reasons

This method uses uncommon error codes on failed logons to determine suspicious activity and tampering with accounts that have been disabled or somehow restricted. Depending on the network environment some failed logons Status can be added to the list.

• Effort: advanced

• Changelog:

  • 01/08/2023 - minor - Similarity strategy for the rule has changed and is now based on the user.target.name field.
  • 04/04/2024 - major - Rule's pattern field changed

Admin User RDP Remote Logon

Detects remote login through Remote Desktop Protocol (RDP) by Administrator user depending on internal pattern. Check before activation the identifiable administrators usernames (pattern or special unique character ("Admin*") to adapt and add some filtering.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Authentication Impossible Travel

Detects impossible travel when performing authentication from a source IP address, grouped by username.

• Effort: advanced

• Changelog:

  • 27/07/2024 - major - review filter to avoid false positive

Broadcom Edge Secure Web Gateway High Threat

Detects when a high threat is detected by Broadcom Edge Secure Web Gateway.

• Effort: master

Brute-Force On Fortinet Firewall Login

Spots many failed attempts to log on an administration interface.

• Effort: master

Denied Access To Remote Desktop

Detects when an authenticated user who is not allowed to log on remotely attempts to connect to this computer through Remote Desktop. This event can be generated by attackers when searching for available windows servers in the network. This rule detects only users from external network.

• Effort: intermediate

• Changelog:

  • 19/10/2023 - minor - Minor change in selection to reduce false positives.
  • 26/03/2024 - major - Rule's pattern field changed

Failed Logon Followed By A Success From Public IP Addresses

A login from a public IP can indicate a misconfigured firewall or network boundary. The detection look for 5 or more failed attemps followed by a successfull one. The sekoia.tags are used to filter internal Ipv4 addresses.

• Effort: master

• Changelog:

  • 29/05/2024 - major - Adding new field and switching to correlation rule.
  • 04/04/2024 - major - Rule's pattern field changed

Fortigate Firewall Successful External Login

Detects succesfull access to administration console of firewall from another IP address than 127.0.0.1. Prerequisites, check that the firewall logs format corresponds to the rule

• Effort: master

Google Cloud Audit Logs Account Suspended

Detects when Google Cloud Audit Logs notify a user account suspended for a suspicious activity

• Effort: intermediate

Google Cloud Audit Logs Application Added

Detects when an application is added to Google Workspace Domain. This should be an expected change made by an administrator and need to be checked.

• Effort: intermediate

Google Cloud Audit Logs Application Authorized

Detects when an application is authorized to access a Google user account. An exception is currently made for GMAIL because of the large number of hits.

• Effort: master

Google Cloud Audit Logs Attack Warning

Detects when Google Cloud Audit Logs notify an attack warning such as the famous "Government-backed attack".

• Effort: intermediate

Google Workspace Account Warning

Detects a suspicious login, leaked password, or account disabled following suspicious activity.

• Effort: elementary

Google Workspace Admin Creation

Detects when an admin is created or when his role is changed.

• Effort: master

• Changelog:

  • 22/05/2024 - minor - Adding new element to increase detection.

Google Workspace Suspicious Login

Detects a suspicious login reported by google.

• Effort: master

Login Brute-Force On Firewall

Detects successful access to administration console of a firewall after several failure.

• Effort: advanced

Login Brute-Force On FreeRadius

A user has attempted to login several times (brute-force) with error then one success.

• Effort: intermediate

Login Brute-Force On Sekoia.io

Detects successful access to Sekoia.io after several failure.

• Effort: intermediate

• Changelog:

  • 22/05/2024 - minor - Switch the group-by clause to a sekoiaio uuid field.

Microsoft 365 Device Code Authentication

Authentication via a device code is designed for use with input constrained devices. This method can however be abused, particularly in social engineering attacks. Whitelisting based on the organisation's practices is likely required to make this rule useful (e.g. excluding the public IP ranges of the organisation, excluding authentications attempt from managed devices, etc.). Note: if you collect Entra ID SignInLogs, the rule "Microsoft Entra ID (Azure AD) Device Code Authentication" is a better equivalent to this rule.

• Effort: master

Microsoft Entra ID (Azure AD) Device Code Authentication

Authentication via a device code is designed for use with input constrained devices. This method can however be abused, particularly in social engineering attacks. Whitelisting based on the organisation's practices is likely required to make this rule useful (e.g. excluding the public IP ranges of the organisation, excluding authentications attempt from managed devices, etc.)

• Effort: master

Netskope Admin Audit

Audit events for admin activites, from Logins to policies' changes.

• Effort: master

• Changelog:

  • 28/03/2024 - minor - Rule effort was updated to master

Okta Many Passwords Reset Attempt

This rule identifies a high number of Okta user password reset or account unlock attempts. An adversary may attempt to obtain unauthorized access to Okta user accounts using these methods and attempt to blend in with normal activity in their target's environment and evade detection.

• Effort: advanced

Okta Suspicious Activity Reported

Detects when a user reports suspicious activity for their Okta account. These events should be investigated, as they can help security teams identify when an adversary is attempting to gain access to their network.

• Effort: advanced

Okta Unauthorized Access to App

An user tries to access an unauthorized application.

• Effort: master

User Added to Local Administrators

Detects when user accounts are added which could be legitimate activity or a sign of privilege escalation activity, Potential False-Positives Legitimate administrative activity WinRM clients

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.
  • 04/04/2024 - major - Rule's pattern field changed

Replication Through Removable Media

External Disk Drive Or USB Storage Device

Detects external diskdrives or plugged in USB device.

• Effort: advanced

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

External Remote Services

Anomaly New PowerShell Remote Session

Detects when PowerShell remote sessions are created in a short amount of time.

• Effort: master

• Changelog:

  • 11/06/2024 - minor - Adding fields to be displayed in the alert.

Datadome Protection Intrusion Detection

Detects when Datadome protection raises an alert linked to intrusion. Datadome is used against fraud and bots.

• Effort: master

Failed Logon Followed By A Success From Public IP Addresses

A login from a public IP can indicate a misconfigured firewall or network boundary. The detection look for 5 or more failed attemps followed by a successfull one. The sekoia.tags are used to filter internal Ipv4 addresses.

• Effort: master

• Changelog:

  • 29/05/2024 - major - Adding new field and switching to correlation rule.
  • 04/04/2024 - major - Rule's pattern field changed

SecurityScorecard Vulnerability Assessment Scanner New Issues

Raises an alert when SecurityScorecard Vulnerability Assessment Scanner find new issues.

• Effort: master

Trend Micro Apex One Intrusion Detection Alert

Trend Micro Apex One has raised an alert for an intrusion detection.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Trend Micro Cloud One High Intrusion

Detects when Trend Micro EDR raised an alert for an intrusion with a high severity level.

• Effort: master

Trend Micro Cloud One Low Intrusion

Detects when Trend Micro EDR raised an alert for an intrusion with a low severity level.

• Effort: master

Trend Micro Cloud One Medium Intrusion

Detects when Trend Micro EDR raised an alert for an intrusion with a medium severity level.

• Effort: master

Exploit Public-Facing Application

CVE-2018-11776 Apache Struts2

Apache Struts versions 2.3 to 2.3.34 and 2.5 to 2.5.16 suffer from possible Remote Code Execution when alwaysSelectFullNamespace is true (either by user or a plugin like Convention Plugin) and then: results are used with no namespace and in same time, its upper package have no or wildcard namespace and similar to results, same possibility when using url tag which doesn't have value and action set and in same time, its upper package have no or wildcard namespace.

• Effort: intermediate

CVE-2018-13379 Fortinet Exploit

Detects the successful exploitation of the Fortinet FortiOS CVE-2018-13379. This CVE is one of the most exploited CVEs since 2018. It is exploited by APT threat actors as well as cybercriminals. The exploitation of this CVE lead an unauthenticated user to get full access to FortiOS system file through SSL VPN via specially crafted HTTP resource requests. The exploit read /dev/cmdb/sslvpn_websession file, that contains login and passwords in (clear/text). An HTTP response status code = 200, means the file was successfully accessed. This vulnerability affects FortiOS 5.6.3 to 5.6.7 and FortiOS 6.0.0 to 6.0.4.

• Effort: advanced

CVE-2019-0604 SharePoint

Detects the exploitation of the SharePoint vulnerability (CVE-2019-0604).

• Effort: advanced

• Changelog:

  • 04/11/2024 - minor - Added filter to reduce false positives

CVE-2019-11510 Pulse Secure Exploit

Detects the successful exploitation of the Pulse Secure vulnerability CVE-2019-11510. This CVE is one of the most exploited CVEs since 2019. It is exploited by diverse threat actors, leading sometimes in ransomware deployement among these groups: Maze, Conti, Egregor, DoppelPaymer, NetWalker and REvil. But also APT actors such as APT29. The exploitation of this CVE allows a remote, unauthenticated attacker to compromise a vulnerable VPN server. The attacker may be able to gain access to all active users and their plain-text credentials. It may also be possible for the attacker to execute arbitrary commands on each VPN client as it successfully connects to the VPN server. The exploit reads /etc/passwd file to get access to login and passwords in (clear/text). An HTTP response status code = 200, means the file was successfully accessed. This vulnerability affects 8.1R15.1, 8.2 before 8.2R12.1, 8.3 before 8.3R7.1, and 9.0 before 9.0R3.4 products.

• Effort: elementary

CVE-2019-19781 Citrix NetScaler (ADC)

Detects CVE-2019-19781 exploitation attempt against Citrix NetScaler (ADC), Application Delivery Controller and Citrix Gateway Attack.

• Effort: elementary

CVE-2019-2725 Oracle Weblogic Exploit

Detects the successful exploitation of a deserialization vulnerability in Oracle Weblogic Server, CVE-2019-2725. This vulnerability affects versions 10.X and 12.1.3 of WebLogic that have the components wls9_async_response.war and wls-wsat.war enabled. It is a remote code execution which can be exploited without authentication via HTTP. An HTTP response status code = 202, means the target is vulnerable, the analyst then has to look in depth to check if a webshell has been uploaded or something else has been done.

• Effort: elementary

CVE-2020-0688 Microsoft Exchange Server Exploit

Detects the exploitation of CVE-2020-0688. The POC exploit a .NET serialization vulnerability in the Exchange Control Panel (ECP) web page. The vulnerability is due to Microsoft Exchange Server not randomizing the keys on a per-installation basis resulting in them using the same validationKey and decryptionKey values. With knowledge of these, values an attacker can craft a special viewstate to use an OS command to be executed by NT_AUTHORITY\SYSTEM using .NET deserialization. To exploit this vulnerability, an attacker needs to leverage the credentials of an account it had already compromised to authenticate to OWA.

• Effort: elementary

CVE-2020-1147 SharePoint

Detection of SharePoint vulnerability CVE-2020-1147.

• Effort: advanced

CVE-2020-14882 Oracle WebLogic Server

Detects the exploitation of the Oracle WebLogic Server vulnerability (CVE-2020-16952).

• Effort: advanced

CVE-2020-17530 Apache Struts RCE

Detects the exploitation of the Apache Struts RCE vulnerability (CVE-2020-17530).

• Effort: intermediate

CVE-2020-5902 F5 BIG-IP Exploitation Attempts

Detects the exploitation attempt of the vulnerability found in F5 BIG-IP and described in CVE-2020-5902.

• Effort: elementary

CVE-2021-20021 SonicWall Unauthenticated Administrator Access

Detects the exploitation of SonicWall Unauthenticated Admin Access.

• Effort: advanced

CVE-2021-21972 VMware vCenter

The vSphere Client (HTML5) contains a remote code execution vulnerability in a vCenter Server plugin. A malicious actor with network access to port 443 may exploit this issue to execute commands with unrestricted privileges on the underlying operating system that hosts vCenter Server. This affects VMware vCenter Server (7.x before 7.0 U1c, 6.7 before 6.7 U3l and 6.5 before 6.5 U3n) and VMware Cloud Foundation (4.x before 4.2 and 3.x before 3.10.1.2). POST request on the following PATH "/ui/vropspluginui/rest/services/uploadova". If in response body (500) the words it has "uploadFile", that means the vCenter is available to accept files via POST without any restrictions.

• Effort: intermediate

CVE-2021-21985 VMware vCenter

The VMware vSphere Client (HTML5) contains a remote code execution vulnerability due to lack of input validation in the Virtual SAN Health Check plug-in which is enabled by default in vCenter Server. A malicious actor with network access to port 443 may exploit this issue to execute commands with unrestricted privileges on the underlying operating system that hosts vCenter Server. This affects VMware vCenter Server (7.0 before 7.0 U2b, 6.7 before 6.7 U3n and 6.5 before 6.5 U3p) and VMware Cloud Foundation (4.x before 4.2.1 and 3.x before 3.10.2.1).

• Effort: advanced

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CVE-2021-22123 Fortinet FortiWeb OS Command Injection

Detects Fortinet FortiWeb OS Command Injection (August 2021) vulnerability exploitation attempt. A remote, authenticated attacker can execute arbitrary commands on the system hosting a vulnerable FortiWeb WAF by sending a POST request with the command in the name field. At the time of writing this rule, it would appear that the request would respond in code 500 for a successful exploitation attempt.

• Effort: advanced

CVE-2021-22893 Pulse Connect Secure RCE Vulnerability

Detects potential exploitation of the authentication by-pass vulnerability that can allow an unauthenticated user to perform remote arbitrary file execution on the Pulse Connect Secure gateway. It is highly recommended to apply the Pulse Secure mitigations and seach for indicators of compromise on affected servers if you are in doubt over the integrity of your Pulse Connect Secure product.

• Effort: intermediate

CVE-2021-22986 F5 BIG-IP iControl REST Unauthenticated RCE

Detects successful exploitation of the F5 BIG-IP vulnerability CVE-2021-22986.

• Effort: elementary

CVE-2021-26855 Exchange SSRF

Detects the exploitation of ProyxLogon vulerability on Exchange servers.

• Effort: advanced

CVE-2021-34527 PrintNightmare Suspicious Actions From Spoolsv

Detects suspicious image loads and file creations from the spoolsv process which could be a sign of an attacker trying to exploit the PrintNightmare vulnerability, CVE-2021-34527. A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged file operations. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. This works as well as a Local Privilege escalation vulnerability. To fully work the rule requires to log for Loaded DLLs and File Creations, which can be done respectively using the Sysmon's event IDs 7 and 11.

• Effort: master

CVE-2021-41773 Apache 2.4.49 Path Traversal

Detects successful exploitation of the Apache Path Traversal CVE-2021-41773.

• Effort: advanced

CVE-2021-43798 Grafana Directory Traversal

Grafana version 8.x has a 0day arbitrary file read (with no fix yet) based on a directory traversal vulnerability

• Effort: intermediate

Exploited CVE-2020-10189 Zoho ManageEngine

Detects the exploitation of Zoho ManageEngine Desktop Central Java Deserialization vulnerability reported as CVE-2020-10189.

• Effort: elementary

Failed Logon Followed By A Success From Public IP Addresses

A login from a public IP can indicate a misconfigured firewall or network boundary. The detection look for 5 or more failed attemps followed by a successfull one. The sekoia.tags are used to filter internal Ipv4 addresses.

• Effort: master

• Changelog:

  • 29/05/2024 - major - Adding new field and switching to correlation rule.
  • 04/04/2024 - major - Rule's pattern field changed

GitLab CVE-2021-22205

Detects GitLab vulnerability CVE-2021-22205 exploitation success. It allows an attacker to do some remote code execution with user git. The HTTP return code 422 indicates a successfull exploitation.

• Effort: intermediate

Suspicious DNS Child Process

Detects suspicious processes spawned by the dns.exe process. It could be a great indication of the exploitation of the DNS RCE bug reported in CVE-2020-1350 (SIGRED).

• Effort: intermediate

Hardware Additions

External Disk Drive Or USB Storage Device

Detects external diskdrives or plugged in USB device.

• Effort: advanced

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Phishing

Cisco ESA Suspicious Email With Attachment

Detects an email with an attachment, from a sender tagged as suspect, detected by either the Antivirus or the Advanced Malware Protection (AMP) engine and delivered to the recipient

• Effort: advanced

Cisco Umbrella Threat Detected

Cisco Umbrella has detected a malicious traffic categorized as malware, phishing or adware.

• Effort: intermediate

Download Files From Non-Legitimate TLDs

Detects file downloads from non-legitimate TLDs. Additional legitimates TLDs should be filtered according to the business habits.

• Effort: master

Download Files From Suspicious TLDs

Detects download of certain file types from hosts in suspicious TLDs

• Effort: master

ESET Protect Malware

Detects when Eset Protect tagged an event as linked to a malware with infected files.

• Effort: master

Google Workspace Blocked Sender

Detects when a user is blocked by google workspace.

• Effort: advanced

Malware Detected By Vade For M365

Vade Secure product Vade for M365 has detected a malware contained in the message.

• Effort: master

Malware Detected By Vade For M365 And Not Blocked

Vade Secure product Vade for M365 has detected a malware contained in the message and didn't delete it.

• Effort: advanced

Microsoft 365 (Office 365) Anti-Phishing Policy Deletion

Detects when the anti-phishing policy is removed from Microsoft 365 (Office 365). By default, Microsoft 365 (Office 365) includes built-in features that help protect users from phishing attacks. This policy specifies the phishing protections to enable or disable, and the actions to apply options.

• Effort: master

Microsoft 365 (Office 365) Anti-Phishing Rule Deletion

Detects the deactivation of the anti-phishing rule from Microsoft 365 (Office 365). The anti-phishing rule specifies the priority and recipient filters (who the policy applies to) for an anti-phish policy.

• Effort: master

Microsoft 365 (Office 365) AtpDetection

Detects when an AtpDetection (Advanced Threat Protection) event from the Office365 ThreatIntelligence service is raised. AtpDetection is a service which secures emails, attachments, and files by scanning them for threats.

• Effort: intermediate

Microsoft 365 (Office 365) DLP Policy Removed

Detects when a DLP (Data Loss Prevention) policy is removed in Microsoft 365 (Office 365). DLP policies defines which resources can be shared and with whom, preventing sensitive information from being leaked.

• Effort: master

Microsoft 365 (Office 365) MCAS Detection Velocity

Detects when Microsoft Cloud App Security identifies two user activities (a single or multiple sessions) originating from geographically distant locations within a time period shorter than the time it would have taken the user to travel from the first location to the second. To use this feature, you must have an Microsoft 365 (Office 365) E5 license (https://docs.microsoft.com/en-us/defender-cloud-apps/get-started?culture=fr-fr&country=FR).

• Effort: master

Microsoft 365 (Office 365) MCAS Inbox Hiding

Detects when Microsoft Cloud App Security identifies that a suspicious inbox rule was set on a user’s inbox. This may indicate that the user account is compromised, and that the mailbox is being used to distribute spam and malware in your organization. To use this feature, you must have an Microsoft 365 (Office 365) E5 license (https://docs.microsoft.com/en-us/defender-cloud-apps/get-started?culture=fr-fr&country=FR).

• Effort: master

Microsoft 365 (Office 365) MCAS New Country

Detects when Microsoft Cloud App Security identifies a sign-in from a country where it has never connected. To use this feature, you must have an Microsoft 365 (Office 365) E5 license (https://docs.microsoft.com/en-us/defender-cloud-apps/get-started?culture=fr-fr&country=FR).

• Effort: master

Microsoft 365 (Office 365) MCAS Repeated Delete

Detects when Microsoft Cloud App Security identifies that a user has deleted an unusually large volume of files. To use this feature, you must have an Microsoft 365 (Office 365) E5 license (https://docs.microsoft.com/en-us/defender-cloud-apps/get-started?culture=fr-fr&country=FR).

• Effort: master

Microsoft 365 (Office 365) MCAS Repeated Failed Login

Detects when Microsoft Cloud App Security identifies a large number of failed login attempts which may indicate a brute-force attempt. To use this feature, you must have an Microsoft 365 (Office 365) E5 license (https://docs.microsoft.com/en-us/defender-cloud-apps/get-started?culture=fr-fr&country=FR).

• Effort: master

Microsoft 365 (Office 365) MCAS Risky IP

Detects when Microsoft Cloud App Security identifies sign-ins from a risky IP address, for example, using an anonymous browser or VPN. To use this feature, you must have an Microsoft 365 (Office 365) E5 license (https://docs.microsoft.com/en-us/defender-cloud-apps/get-started?culture=fr-fr&country=FR).

• Effort: master

Microsoft 365 (Office 365) MailBoxAuditBypassAssociation Option Implementation

Detects the implementation of a MailBoxAuditBypassAssociation option in Microsoft 365 (Office 365). This option is used when you configure a user or computer account to bypass mailbox audit logging, access or actions taken by the user or computer account to any mailbox isn't logged.

• Effort: master

Microsoft 365 (Office 365) Malware Filter Policy Removed

Detects when a malware policy has been deleted in Microsoft 365 (Office 365). A malware filter policy is used to alert administrators that an internal user sent a message that contained malware.

• Effort: master

Microsoft 365 (Office 365) Malware Filter Rule Deletion

Detects when a malware filter rule has been deleted in Microsoft 365 (Office 365). The malware filter rule specifies the priority and recipient filters (who the policy applies to) for a malware filter policy.

• Effort: master

Microsoft 365 (Office 365) Malware Uploaded On OneDrive

Detects when Microsoft 365 (Office 365) identifies a malicious file uploaded to OneDrive. Attackers can use this method to propagate through the network.

• Effort: intermediate

Microsoft 365 (Office 365) Malware Uploaded On SharePoint

Detects when Microsoft 365 (Office 365) identifies a malicious file uploaded to SharePoint. Attackers can use this method to propagate through the network.

• Effort: intermediate

Microsoft 365 (Office 365) Mass Download By A Single User

Identifies when Microsoft Cloud App Security reports that a single user performs more than 50 downloads within 1 minute.

• Effort: master

• Changelog:

  • 09/10/2023 - major - Fix field names to match the current parser.

Microsoft 365 (Office 365) Potential Ransomware Activity Detected

Detects when Microsoft Cloud App Security reports that a user has uploaded files to the cloud that might be infected with ransomware.

• Effort: master

• Changelog:

  • 09/10/2023 - major - Fix field names to match the current parser.

Microsoft 365 (Office 365) Safe Attachment Rule Disabled

Detects when the safe attachment rule has been deleted in Microsoft 365 (Office 365). Safe Attachments is a feature in Microsoft Defender for Microsoft 365 (Office 365) that opens email attachments in a special hypervisor environment to detect malicious activity.

• Effort: master

Microsoft 365 (Office 365) Safelinks Disabled

Detects when a safelink rule has been deleted in Microsoft 365 (Office 365). Safe Links is a feature in Defender for Microsoft 365 (Office 365) that provides URL scanning and rewriting of inbound email messages in mail flow, and time-of-click verification of URLs and links in email messages and other locations.

• Effort: master

Microsoft 365 (Office 365) Unusual Volume Of File Deletion

Detects when Microsoft Cloud App Security identifies that a user has deleted an unusually large volume of files.

• Effort: master

• Changelog:

  • 09/10/2023 - major - Fix field names to match the current parser.

Microsoft 365 Security and Compliance Center High Severity Alert

A security or compliance-related alert of high severity was raised, based on the policies of the tenant. This rule can be very noisy depending on the configuration of the tenant. Alert filters are likely required. In addition, most alerts don't include any context, and are only useful if the analysts have access to the Microsoft portals to investigate.

• Effort: master

Microsoft 365 Security and Compliance Center Medium Severity Alert

A security or compliance-related alert of medium severity was raised, based on the policies of the tenant. This rule can be very noisy depending on the configuration of the tenant. Alert filters are likely required. In addition, most alerts don't include any context, and are only useful if the analysts have access to the Microsoft portals to investigate.

• Effort: master

Microsoft Defender for Office 365 High Severity AIR Alert

Microsoft Defender for Office 365 includes the capability to run Automated investigation and response (AIR) actions. This rule detects when a High severity alert triggers an automated investigation, such as when a potentially malicious URL click was detected, or when a user is restricted from sending email.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Microsoft Defender for Office 365 Low Severity AIR Alert Handled Automatically

Microsoft Defender for Office 365 includes the capability to run Automated investigation and response (AIR) actions. This rule detects when a Low or Informational severity alert triggered an automated investigation, and remediation was conducted automatically. Low and Informational alerts include when an email is reported by a user, or when a malicious email is removed after delivery.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Microsoft Defender for Office 365 Low Severity AIR Alert Requires Action

Microsoft Defender for Office 365 includes the capability to run Automated investigation and response (AIR) actions. This rule detects when a Low or Informational severity alert triggered an automated investigation, and remediation actions need to be approved or conducted. Low and Informational alerts include when an email is reported by a user, or when a malicious email is removed after delivery.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Microsoft Defender for Office 365 Medium Severity AIR Alert

Microsoft Defender for Office 365 includes the capability to run Automated investigation and response (AIR) actions. This rule detects when a Medium severity alert triggers an automated investigation, such as when suspicious email sending patterns are detected from an account.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Multiple Authentication On Microsoft 365 (Office 365) Portal From Two IP Addresses

Detection of login events from two IP addresses within 3mn, as it could happen if someone got phished with a tool like Evilginx2.

• Effort: intermediate

Okta Phishing Detection with FastPass Origin Check

Okta's FastPass prevents known phishing sites.

• Effort: intermediate

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Phishing Detected By Vade For M365

Vade Secure product Vade for M365 has detected a phishing attempt.

• Effort: master

Phishing Detected By Vade For M365 And Not Blocked

Vade Secure product Vade for M365 has detected a phishing attempt and didn't move it to junk folder.

• Effort: advanced

Possible Malicious File Double Extension

Detects request to potential malicious file with double extension

• Effort: elementary

Proofpoint TAP Email Classified As Malware But Allowed

An email was classified as malware with a threat score greater than 0 by Proofpoint TAP but was not blocked. The threshold on the Threat Score has been defined to avoid a high amount of false positives.

• Effort: advanced

Proofpoint TAP Email Classified As Phishing But Allowed

An email was classified as phishing with a threat score greater than 50 by Proofpoint TAP but was not blocked. The threshold on the Threat Score has been defined to avoid a high amount of false positives.

• Effort: advanced

Proofpoint TAP Email Classified As Spam But Allowed

An email was classified as spam with a threat score greater than 50 by Proofpoint TAP but was not blocked. The threshold on the Threat Score has been defined to avoid a high amount of false positives.

• Effort: advanced

RDP Configuration File From Mail Process

Detects RDP configuration file being created or executed by a Mail-related process like Outlook. RDP configuration file will allow, when opened, an user to connect to the configured server easily. Attackers use this to trick victims in order to get a shared drive and potentially retrieve the data from that drive, but also drop a malicious file on the drive to establish persistence. Using RDP can also expose the victim's credential and clipboard data on some cases.

• Effort: advanced

Retarus Email Security Threat Detected (CxO Or Patient Zero Detection)

Cx0 fraud and Patient Zero Detection alerts detected by Retarus Email Security. CxO Fraud Detection uses algorithms that identify from-spoofing and domain-spoofing, to detect falsified sender addresses (e.g. from high level executives - CEO, CFO...). Patient Zero Detection® uses a digital fingerprint to identify emails containing malware that have already been delivered.

• Effort: advanced

Retarus Email Security Threat Detected (MultiScan)

Antivirus MultiScan alerts detected by Retarus Email Security. AntiVirus MultiScan automatically scans incoming and outgoing emails and file attachments for viruses with up to four virus scanners and uses heuristic analysis to protect from unknown malware.

• Effort: intermediate

Retarus Email Security Threat Detected (Sandboxing)

Sandboxing alerts detected by Retarus Email Security. Sandboxing subjects specific file attachments to an in-depth analysis. Retarus uses a sandboxing solution from the specialized and highly respected third-party provider Palo Alto Networks for this advanced threat assessment. Emails identified as infected are either deleted or quarantined, and the intended recipient is notified.

• Effort: elementary

SEKOIA.IO Intelligence Feed

Detect threats based on indicators of compromise (IOCs) collected by SEKOIA's Threat and Detection Research team.

• Effort: elementary

Scam Detected By Vade For M365

Vade Secure product Vade for M365, has detected a scam e-mail.

• Effort: master

Scam Detected By Vade For M365 And Not Blocked

Vade Secure product Vade for M365, has detected a scam e-mail and didn't block it.

• Effort: advanced

• Changelog:

  • 18/06/2024 - minor - Adding filter when whitelisted.

Spam Detected By Vade For M365

Vade Secure product Vade for M365, has detected a spam e-mail.

• Effort: master

Spam Detected By Vade For M365 And Not Blocked

Vade Secure product Vade for M365, has detected a spam e-mail and didn't block it.

• Effort: advanced

Spearphishing (CEO Fraud) Detected By Vade For M365

Vade Secure product Vade for M365 has detected a spearphishing attempt with CEO fraud thematic. Impersonation of CEO or senior management members requesting urgent money transfer, usually on an unknown RIB.

• Effort: master

Spearphishing (Gift Cards Fraud) Detected By Vade For M365

Vade Secure product Vade for M365 has detected a spear-phishing attempt with gift-cards fraud thematic. Executive impersonation requesting a money transfer to set up gift-cards for employees. Confidentiality and discretion are usually implied.

• Effort: master

Spearphishing (Initial Contact Fraud) Detected By Vade For M365

Vade Secure product Vade for M365 has detected a spearphishing attempt with initial contact fraud thematic. Do not contains any malicious content or specific actions other than a request to reply to the email. “Are you available?”. The main goal is to incite a reply that could register the sending address as a known and legitimate address.

• Effort: master

Spearphishing (Lawyer Fraud) Detected By Vade For M365

Vade Secure product Vade for M365 has detected a spearphishing attempt with lawyer fraud thematic. Impersonation of lawyers and lawyers' firms. The main goal is to make sure the victims will not raise awareness around them. Confidentiality restrictions are implied.

• Effort: master

Spearphishing (W2 Fraud) Detected By Vade For M365

Vade Secure product Vade for M365 has detected a spearphishing attempt with W2 fraud thematic. Executive or HR impersonation phishing for social security numbers or tax identification numbers. Collected data are generally used for identity theft schemes.

• Effort: master

Suspicious Double Extension

Detects suspicious use of an .exe extension after a non-executable file extension like .pdf.exe, a set of spaces or underlines to cloak the executable file in spearphishing campaigns

• Effort: advanced

• Changelog:

  • 21/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.

Suspicious Download Links From Legitimate Services

Detects users clicking on Google docs links to download suspicious files. This technique was used a lot by Bazar Loader in the past.

• Effort: intermediate

• Changelog:

  • 13/06/2024 - minor - Adding similarity strategy and changing effort level.
  • 15/10/2024 - minor - Adding filter to reduce false positives.

Suspicious Email Attachment Received

Detects email containing a suspicious file as an attachment, based on its extension.

• Effort: advanced

• Changelog:

  • 15/04/2024 - minor - Update email from field to latest parser format
  • 14/11/2024 - major - Adding new file extension and new condition to make the rule broader as it can now match on more intakes.

Suspicious Hangul Word Processor Child Process

Detects suspicious Hangul Word Processor (HWP) child process that could indicate an exploitation as used by the Lazarus APT during the Operation Ghost Puppet (2018). This activity could correspond to a maldoc execution related to a .hwp file. Hangul is a proprietary word processing application that supports the Korean written language.

• Effort: elementary

Suspicious Outlook Child Process

Detects suspicious child processes of Microsoft Outlook. These child processes are often associated with spearphishing activity.

• Effort: intermediate

Execution

Windows Management Instrumentation

Blue Mockingbird Malware

Attempts to detect system changes made by Blue Mockingbird

• Effort: elementary

Impacket Wmiexec Module

Detection of impacket's wmiexec example, used by attackers to execute commands remotely.

• Effort: elementary

• Changelog:

  • 22/03/2024 - minor - improve filter to extand detection

Invoke-TheHash Commandlets

Detects suspicious Invoke-TheHash PowerShell commandlet used for performing pass the hash WMI and SMB tasks.

• Effort: elementary

Suspicious Mshta Execution From Wmi

Detects mshta executed by wmiprvse as parent. It has been used by TA505 with some malicious documents.

• Effort: intermediate

WMI DLL Loaded Via Office

Detects Windows Management Instrumentation (WMI) DLL loaded via Office process. This activity may correspond to VBA macro executing WMI commands, which is highly suspicious. The prerequisite is to log Loaded DLLs images, which can be done with the Sysmon Event ID 7 (DLL image loaded by process).

• Effort: master

WMI Fingerprint Commands

Detects attacker fingerprint activities based on the correlation of specific WMIC commands. This has been observed with Aurora malware.

• Effort: intermediate

WMI Install Of Binary

Detection of WMI used to install a binary on the host. It is often used by attackers as a signed binary to infect an host.

• Effort: elementary

WMIC Uninstall Product

Detects products being uninstalled using WMIC command.

• Effort: intermediate

• Changelog:

  • 13/02/2024 - minor - Exclude non-Windows operating systems (false positives)

WMImplant Hack Tool

WMImplant is a powershell framework used by attacker for reconnaissance and exfiltration, this rule attempts to detect WMimplant arguments and invokes commands.

• Effort: intermediate

• Changelog:

  • 29/11/2023 - minor - Added a selection to filter some false positives.
  • 26/03/2024 - major - Rule's pattern field changed

Wmic Process Call Creation

The WMI command-line (WMIC) utility provides a command-line interface for Windows Management Instrumentation (WMI). WMIC is compatible with existing shells and utility commands. Although WMI is supposed to be an administration tool, it is wildy abused by threat actors. One of the reasons is WMI is quite stealthy. This rule detects the wmic command line launching a process on a remote or local host.

• Effort: intermediate

• Changelog:

  • 01/08/2023 - major - Rewritten as a regex to reduce false positives

Wmic Service Call

Detects either remote or local code execution using wmic tool.

• Effort: intermediate

XSL Script Processing And SquiblyTwo Attack

Detection of an attack where adversaries may bypass application control and obscure execution of code by embedding scripts inside XSL files. Another variation of this technique, dubbed "Squiblytwo", involves to invoke JScript or VBScript within an XSL file.

• Effort: intermediate

Scheduled Task/Job

BazarLoader Persistence Using Schtasks

Detects possible BazarLoader persistence using schtasks. BazarLoader will create a Scheduled Task using a specific command line to establish its persistence.

• Effort: intermediate

Blue Mockingbird Malware

Attempts to detect system changes made by Blue Mockingbird

• Effort: elementary

Chafer (APT 39) Activity

Detects previous Chafer (APT 39) activity attributed to OilRig as reported in Nyotron report in March 2018.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Creation or Modification of a GPO Scheduled Task

Detects lateral movement using GPO scheduled task, often used to deploy ransomware at scale. This rule is based on the EventID 5145 which is specific to Windows Servers. The advanced audit policy setting Object Access > Audit Detailed File Share must be configured for Success/Failure.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Cron Files Alteration

Cron Files and Cron Directory alteration used by attacker for persistency or privilege escalation. To ensure full performance on this rule, auditbeat intake must be configure with the module file_integrity containing path mentionned in the pattern.

• Effort: advanced

Google Workspace App Script Scheduled Task

Detects when a scheduled task is launched by Google App Script. This product is used to create scripts and integrate applications within Google Workspace.

• Effort: advanced

Qakbot Persistence Using Schtasks

Detects possible Qakbot persistence using schtasks.

• Effort: intermediate

Remote Task Creation Via ATSVC Named Pipe

Detects remote task creation via at.exe or API interacting with ATSVC Named Pipe. This requires Windows Security event logging with the File Share policy.

• Effort: intermediate

• Changelog:

  • 21/03/2024 - minor - change filter to ACL hex value

STRRAT Scheduled Task

Detect STRRAT when it achieves persistence by creating a scheduled task. STRRAT is a Java-based stealer and remote backdoor, it establishes persistence using this specific command line: 'cmd /c schtasks /create /sc minute /mo 30 /tn Skype /tr "C:\Users\Admin\AppData\Roaming\SAMPLENAME.jar"'

• Effort: intermediate

Schtasks Persistence With High Privileges

Detection of scheduled task with high privileges used by attacker for persistence.

• Effort: elementary

Schtasks Suspicious Parent

Detects schtasks started from suspicious and/or unusual processes.

• Effort: intermediate

Spyware Persistence Using Schtasks

Detects possible Agent Tesla or Formbook persistence using schtasks. The name of the scheduled task used by these malware is very specific (Updates/randomstring).

• Effort: intermediate

Suspicious Scheduled Task Creation

Detects suspicious scheduled task creation, either executed by a non-system user or a user who is not administrator (the user ID is not S-1-5-18 or S-1-5-18-*). This detection rule doesn't match Sysmon EventID 1 because the user SID is always set to S-1-5-18.

• Effort: intermediate

Windows Suspicious Scheduled Task Creation

The rule identify creation of new scheduled task who run suspicious or dangerous command

• Effort: intermediate

Command and Scripting Interpreter

AWS CloudTrail EC2 Startup Script Changed

Detects changes to the EC2 instance startup script. The shell script will be executed as root/SYSTEM everytime the specific instances are booted up.

• Effort: intermediate

AWS GuardDuty High Severity Alert

GuardDuty has detected a threat with a high severity level. A High severity level indicates that the resource in question (an EC2 instance or a set of IAM user sign-in credentials) is compromised and is actively being used for unauthorized purposes.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

AWS GuardDuty Low Severity Alert

GuardDuty has detected a threat with a low severity level. A low severity level indicates attempted suspicious activity that did not compromise your network, for example, a port scan or a failed intrusion attempt.

• Effort: master

AWS GuardDuty Medium Severity Alert

GuardDuty has detected a threat with a medium severity level. A Medium severity level indicates suspicious activity that deviates from normally observed behavior and, depending on your use case, may be indicative of a resource compromise.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Alternate PowerShell Hosts Pipe

Detects alternate PowerShell hosts potentially bypassing detections looking for powershell.exe. Prerequisites are logging for PipeEvents in Sysmon config.

• Effort: advanced

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed
  • 25/11/2024 - minor - improve filter to avoid false positives.

Aspnet Compiler

Detects the starts of aspnet compiler.

• Effort: advanced

AutoIt3 Execution From Suspicious Folder

Detects AutoIt3 execution from an unusual/suspicious folder. Legitimate folders are "Program Files" and "AppData\Local". AutoIt3.exe is a legitimate process used to execute AutoIt program files, which are used by legitimate software, custom scripts, but also malware. Finding AutoIt3 execution from unusual/suspicious folder can help detect malware activities, such as DarkGate execution. The detection rule can be tailored to your environment and your use of AutoIt3 by filtering out folder's execution of legitimate applications or scripts.

• Effort: advanced

Bitdefender GravityZone Endpoint Detection

Bitdefender GravityZone detected a malicious activity on an endpoint

• Effort: master

Bloodhound and Sharphound Tools Usage

Detects default process names and default command line parameters used by Bloodhound and Sharphound tools.

• Effort: intermediate

• Changelog:

  • 11/12/2024 - minor - Added a default similarity based on host name and user name to avoid too many alerts.
  • 26/03/2024 - minor - Adapted the rule to remove false positives.

Correlation Linux Decode And Exec

A Base64 string has been decoded and executed through a pipe. The prerequisites are to enable monitoring of the execve syscall using Auditbeat.

• Effort: intermediate

Correlation Supicious Powershell Drop and Exec

Detects a PowerShell process that download and exec a payload

• Effort: intermediate

CrowdStrike Falcon Identity Protection Detection Critical Severity

CrowdStrike Falcon raised an alert for an Identity-based detection with critical severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Identity Protection Detection High Severity

CrowdStrike Falcon raised an alert for an Identity-based detection with high severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Identity Protection Detection Informational Severity

CrowdStrike Falcon raised an alert for an Identity-based detection with informational severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Identity Protection Detection Low Severity

CrowdStrike Falcon raised an alert for an Identity-based detection with low severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Identity Protection Detection Medium Severity

CrowdStrike Falcon raised an alert for an Identity-based detection with medium severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection

CrowdStrike Falcon agent raised an alert for an intrusion detection

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection Critical Severity

CrowdStrike Falcon agent raised an alert for an intrusion detection with critical severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection High Severity

CrowdStrike Falcon agent raised an alert for an intrusion detection with high severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection Informational Severity

CrowdStrike Falcon agent raised an alert for an intrusion detection with informational severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection Low Severity

CrowdStrike Falcon agent raised an alert for an intrusion detection with low severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection Medium Severity

CrowdStrike Falcon agent raised an alert for an intrusion detection with medium severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Cybereason EDR Alert

Cybereason EDR telemetry has raised an alert

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Cybereason EDR Malware Detection

Cybereason EDR telemetry has detected a malware

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

DNS Exfiltration and Tunneling Tools Execution

Well-known DNS exfiltration tools execution

• Effort: intermediate

Default Encoding To UTF-8 PowerShell

Detects PowerShell encoding to UTF-8, which is used by Sliver implants. The command line just sets the default encoding to UTF-8 in PowerShell.

• Effort: advanced

Default User www data User Compromised

User www_data by default cannot log and use a shell, any syscall of type execve induce user compromise

• Effort: master

Detection of default Mimikatz banner

Detection of default Mimikatz banner in powershell events

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Elise Backdoor

Detects Elise backdoor activity as used by Lotus Blossom

• Effort: elementary

Exploited CVE-2020-10189 Zoho ManageEngine

Detects the exploitation of Zoho ManageEngine Desktop Central Java Deserialization vulnerability reported as CVE-2020-10189.

• Effort: elementary

Exploiting SetupComplete.cmd CVE-2019-1378

Detects exploitation attempts of privilege escalation vulnerability via SetupComplete.cmd and PartnerSetupComplete.cmd described in CVE-2019-1378.

• Effort: intermediate

FromBase64String Command Line

Detects suspicious FromBase64String expressions in command line arguments.

• Effort: master

Gatewatcher AionIQ V103 Shellcode Detect

Detects when a suspicious shellcode is used.

• Effort: master

Generic-reverse-shell-oneliner

To bypass some security equipement or for a sack of simplicity attackers can open raw reverse shell using shell commands

• Effort: intermediate

In-memory PowerShell

Detects loading of essential DLL used by PowerShell, but not by the process powershell.exe. Detects meterpreter's "load powershell" extension and tool such PowerShDll.

• Effort: master

Interactive Terminal Spawned via Python

Identifies when a terminal (tty) is spawned via Python. Attackers may upgrade a simple reverse shell to a fully interactive tty after obtaining initial access to a host.

• Effort: advanced

• Changelog:

  • 02/10/2024 - major - Rule's pattern changed

Invoke-TheHash Commandlets

Detects suspicious Invoke-TheHash PowerShell commandlet used for performing pass the hash WMI and SMB tasks.

• Effort: elementary

Lazarus Loaders

Detects different loaders used by the Lazarus Group APT

• Effort: elementary

Linux Bash Reverse Shell

To bypass some security equipement or for a sack of simplicity attackers can open raw reverse shell using shell commands

• Effort: intermediate

Login Brute-Force Successful On SentinelOne EDR Management Console

A user has attempted to login several times (brute-force) on the SentinelOne EDR Management Console and succeeded to login.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Login Failed Brute-Force On SentinelOne EDR Management Console

A user has attempted to login several times (brute-force) on the SentinelOne EDR Management Console and failed every time.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Malicious PowerShell Keywords

Detects keywords from well-known PowerShell exploitation frameworks

• Effort: advanced

Malspam Execution Registering Malicious DLL

Detects the creation of a file in the C:\Datop folder, or DLL registering a file in the C:\Datop folder. Files located in the Datop folder are very characteristic of malspam execution related to Qakbot or SquirrelWaffle. Prerequisites are Logging for File Creation events, which can be done in the Sysmon configuration (events 11), for the first part of the pattern (TargetFilename).

• Effort: elementary

Malware Outbreak

Spots a peak of malware detection by windows defender on this perimeter.

• Effort: advanced

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

MalwareBytes Uninstallation

Detects command line being used by attackers to uninstall Malwarebytes.

• Effort: intermediate

Microsoft Defender Antivirus Disabled Base64 Encoded

Detects attempts to deactivate/disable Windows Defender through base64 encoded PowerShell command line or scripts.

• Effort: intermediate

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Microsoft Defender Antivirus Set-MpPreference Base64 Encoded

Detects changes of preferences for Windows Defender through command line or PowerShell scripts. Configure Windows Defender using base64-encoded commands is suspicious and could be related to malicious activities.

• Effort: intermediate

Microsoft Defender Antivirus Threat Detected

Detection of a windows defender alert indicating the presence of potential malware

• Effort: advanced

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.
  • 26/03/2024 - major - Rule's pattern field changed

Microsoft Defender XDR Alert

Microsoft Defender XDR has raised an alert. The alert info and evidence events are grouped with the similarity into the same Sekoia.io alert.

• Effort: master

• Changelog:

  • 13/09/2024 - major - Update service name value following Microsoft change

Microsoft Defender XDR Cloud App Security Alert

Microsoft Defender XDR has raised an alert for Microsoft Cloud App Security. The alert info and evidence events are grouped with the similarity into the same Sekoia.io alert.

• Effort: master

• Changelog:

  • 13/09/2024 - major - Update service name value following Microsoft change

Microsoft Defender XDR Endpoint Alert

Microsoft Defender XDR has raised an alert for Microsoft Defender for Endpoint. The alert info and evidence events are grouped with the similarity into the same Sekoia.io alert.

• Effort: master

Microsoft Defender XDR Office 365 Alert

Microsoft Defender XDR for Office 365 has raised an alert. The alert info and evidence events are grouped with the similarity into the same Sekoia.io alert.

• Effort: master

Microsoft Office Creating Suspicious File

Detects Microsoft Office process (word, excel, powerpoint) creating a suspicious file which corresponds to a script or an executable. This behavior highly corresponds to an executed macro which loads an installation script or a malware payload. The rule requires to log for File Creations to work properly, which can be done through Sysmon Event ID 11.

• Effort: master

Microsoft Office Spawning Script

Detects Microsoft Office process (word, excel, powerpoint) spawning wscript.exe or cscript.exe. This typically indicates the parent process launched a malicious macro, or run an exploit. This infection vector is very common and could lead to the deployment of harmful malware.

• Effort: intermediate

Mshta Suspicious Child Process

Detects the use of various web request methods executed remotely via Windows PowerShell

• Effort: intermediate

• Changelog:

  • 17/10/2024 - minor - Adding similarity_strategy and enforce selection

Mustang Panda Dropper

Detects specific process parameters as used by Mustang Panda droppers

• Effort: elementary

Okta Security Threat Detected

Detects when a security threat is detected in Okta.

• Effort: intermediate

Phorpiex DriveMgr Command

Detects specific command used by the Phorpiex botnet to execute a copy of the loader during its self-spreading stage. As described by Microsoft, this behavior is unique and easily identifiable due to the use of folders named with underscores "__" and the PE name "DriveMgr.exe".

• Effort: elementary

PowerShell Commands Invocation

Detects the execution to invoke a powershell command. This was used in an intrusion using Gootloader to access Mimikatz.

• Effort: advanced

PowerShell Credential Prompt

Detects PowerShell calling a credential prompt (using PromptForCredential), like $Credential = $host.ui.PromptForCredential("Need credentials", "Please enter your user name and password.", "", "NetBiosUserName"). The same result can be obtained by using the Get-Credential function but detecting it will trigger a lot of FP.

• Effort: advanced

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.

PowerShell Downgrade Attack

Detects PowerShell downgrade attack by comparing the host versions with the actually used engine version 2.0

• Effort: elementary

PowerShell Download From URL

Detects a Powershell process that contains download commands in its command line string.

• Effort: advanced

• Changelog:

  • 26/05/2023 - minor - Added a filter to the rule as some false positives were observed.
  • 29/11/2023 - minor - Added a filter to the rule as some false positives were observed.

PowerShell EncodedCommand

Detects popular file extensions in commands obfuscated in base64 run through the EncodedCommand option.

• Effort: advanced

PowerShell Invoke Expression With Registry

Detects keywords from well-known PowerShell techniques to get registry key values

• Effort: advanced

PowerShell Invoke-Obfuscation Obfuscated IEX Invocation

Detects all variations of obfuscated powershell IEX invocation code generated by Invoke-Obfuscation framework

• Effort: advanced

PowerShell Malicious Nishang PowerShell Commandlets

Detects Commandlet names and arguments from the Nishang exploitation framework.

• Effort: advanced

• Changelog:

  • 26/07/2024 - minor - Removing tools relationships as it was inaccurate
  • 27/08/2024 - minor - improve filter to avoid false positive

PowerShell Malicious PowerShell Commandlets

Detects Commandlet names from well-known PowerShell exploitation frameworks (PowerSploit...).

• Effort: master

• Changelog:

  • 23/01/2024 - minor - Adding exclusion pattern and selection commandlet
  • 26/07/2024 - minor - Removing tools relationships as it was inaccurate

PowerShell NTFS Alternate Data Stream

Detects writing data into NTFS alternate data streams from PowerShell. Needs Script Block Logging (Event ID 4104)

• Effort: advanced

Powershell Web Request

Detects the use of various web request methods executed remotely via Windows PowerShell.

• Effort: advanced

Python Offensive Tools and Packages

Track installation and usage of offensive python packages and project that are used for lateral movement

• Effort: master

• Changelog:

  • 02/10/2024 - major - Rule's pattern changed

QakBot Process Creation

Detects QakBot like process executions

• Effort: intermediate

Raw Reverse Shell

To bypass some security equipement or for a sack of simplicity attackers can open raw reverse shell using sh and or bash commands

• Effort: master

Screenconnect Remote Execution

Detect cmd or powershell remote execution cmdline via ScreenConnect

• Effort: intermediate

Sekoia.io EICAR Detection

Detects observables in Sekoia.io CTI tagged as EICAR, which are fake samples meant to test detection.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Agent Disabled

A SentinelOne EDR agent has been disabled according to SentinelOne logs.

• Effort: master

SentinelOne EDR Custom Rule Alert

A SentinelOne EDR agent has detected a threat related to a Custom Rule and raised an alert for it.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Malicious Threat Detected And Mitigated Preemptively

A SentinelOne EDR agent has detected a malicious threat which has been mitigated preemptively, defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Malicious Threat Not Mitigated

A SentinelOne EDR agent has detected a threat but did not mitigate it, defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR SSO User Added

A SSO User was added.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Suspicious Threat Not Mitigated (Medium Confidence)

A SentinelOne EDR agent has detected a threat with a medium confidence level (suspicious) but did not mitigate it. This is all defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Detected (Malicious)

A SentinelOne EDR agent has detected a threat with a high confidence level (malicious).

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Detected (Suspicious)

A SentinelOne EDR agent has detected a threat with a medium confidence level (suspicious).

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Mitigation Report Kill Success

A SentinelOne EDR agent has detected and killed a threat (usually kills the malicious process), defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Mitigation Report Quarantine Failed

A SentinelOne EDR agent has failed to quarantine a threat, defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Mitigation Report Quarantine Success

A SentinelOne EDR agent has detected and quarantined a threat with success, defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Mitigation Report Remediate Success

A SentinelOne EDR agent has remediated a threat, defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR User Failed To Log In To The Management Console

A user has failed to log in to the management console.

• Effort: master

SentinelOne EDR User Logged In To The Management Console

A user has logged in to the management console.

• Effort: master

• Changelog:

  • 24/03/2023 - minor - Adjusting displayed columns when the rule triggers an alert. Now timestamp and username will be displayed.

Socat Relaying Socket

Socat is a linux tool used to relay local socket or internal network connection, this technics is often used by attacker to bypass security equipment such as firewall

• Effort: advanced

• Changelog:

  • 14/06/2023 - minor - Added filter to the rule to reduce false positives.

Socat Reverse Shell Detection

Socat is a linux tool used to relay or open reverse shell that is often used by attacker to bypass security equipment.

• Effort: intermediate

• Changelog:

  • 14/06/2023 - minor - Added filter to the rule to reduce false positives.

SquirrelWaffle Malspam Execution Loading DLL

Detects cscript running suspicious command to load a DLL. This behavior has been detected in SquirrelWaffle campaign.

• Effort: intermediate

Suspicious Cmd.exe Command Line

Detection on suspicious cmd.exe command line seen being used by some attackers (e.g. Lazarus with Word macros). This requires Windows process command line logging.

• Effort: master

• Changelog:

  • 30/05/2023 - minor - Adding the Intellij IDEA to filter list
  • 22/11/2024 - major - Adding new elements for detection and filters.
  • 27/11/2024 - minor - Adding new filters to reduce false positives.

Suspicious CodePage Switch with CHCP

Detects a code page switch in command line

• Effort: intermediate

• Changelog:

  • 16/01/2024 - minor - Rename rule to fit with behavior

Suspicious DLL Loaded Via Office Applications

Detects suspicious DLL being loaded by an Microsoft Office Product. Considered as suspects are some .NET DLLs, clr.dll, GAC DLL, DSParse (Active Directoryi services API) or Kerberos DLLs which may be loaded by MS Office processes when executing a potentially malicious macro. The prerequisite is to log the Sysmon Event ID 7 (DLL image loaded by process).

• Effort: master

Suspicious File Name

Detects suspicious file name possibly linked to malicious tool.

• Effort: advanced

Suspicious Microsoft Defender Antivirus Exclusion Command

Detects PowerShell commands aiming to exclude path, process, IP address, or extension from scheduled and real-time scanning. These commands can be used by attackers or malware to avoid being detected by Windows Defender. Depending on the environment and the installed software, this detection rule could raise false positives. We recommend customizing this rule by filtering legitimate processes that use Windows Defender exclusion command in your environment.

• Effort: master

Suspicious Outlook Child Process

Detects suspicious child processes of Microsoft Outlook. These child processes are often associated with spearphishing activity.

• Effort: intermediate

Suspicious PowerShell Invocations - Generic

Detects suspicious PowerShell invocation command parameters through command line logging or ScriptBlock Logging.

• Effort: intermediate

• Changelog:

  • 28/03/2023 - minor - Excluded some commonly observed false positives.

Suspicious PowerShell Invocations - Specific

Detects suspicious PowerShell invocation command parameters.

• Effort: intermediate

• Changelog:

  • 26/05/2023 - minor - Added a filter to the rule as some false positives were observed.

Suspicious PowerShell Keywords

Detects keywords that could indicate the use of some PowerShell exploitation framework.

• Effort: advanced

• Changelog:

  • 23/05/2024 - minor - Added filter to reduce false positives and new suspicious keywords.

Suspicious PrinterPorts Creation (CVE-2020-1048)

Detects new commands that add new printer port which point to suspicious file

• Effort: advanced

Suspicious Scripting In A WMI Consumer

Detects suspicious scripting in WMI Event Consumers. The rule requires to log WMI Consumers, which can be done through Sysmon's Event IDs 20 and 21.

• Effort: intermediate

Suspicious Taskkill Command

Detects rare taskkill command being used. It could be related to Baby Shark malware.

• Effort: intermediate

Suspicious VBS Execution Parameter

Detects suspicious VBS file execution with a specific parameter by cscript. It was observed in the Operation CloudHopper.

• Effort: elementary

Suspicious Windows Script Execution

Detects wscript.exe or cscript.exe executing a script in user directories (C:\ProgramData or C:\Users) with a .txt extension, which is very suspicious. It could strongly correspond to a malware dropper, as seen during SquirrelWaffle maldoc campaign.

• Effort: intermediate

• Changelog:

  • 19/10/2023 - major - Review of the rule to reduce false positives.

Suspicious XOR Encoded PowerShell Command Line

Detects suspicious powershell process which includes bxor command, alternative obfuscation method to b64 encoded commands.

• Effort: advanced

Sysprep On AppData Folder

Detects suspicious Sysprep process start with AppData folder as target (as used by Trojan Syndicasec in Thrip report by Symantec). Sysprep is a Windows tool used to change Windows images from a generalized state to a specialized state, and then back to a generalized state. It can be used to remove all system-specific information and reset the computer.

• Effort: intermediate

TEHTRIS EDR Alert

Tehtris EDR telemetry has raised an alert.

• Effort: master

Trend Micro Apex One Data Loss Prevention Alert

Trend Micro Apex One has raised an alert for data loss prevention.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Trend Micro Apex One Malware Alert

Trend Micro Apex One has detected a malware.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Trend Micro Vision One Workbench Critical Severity Alert

Detects when a critical alert severity is raised by Trend Micro Vision One Workbench.

• Effort: master

Trend Micro Vision One Workbench Low Severity Alert

Detects when a low alert severity is raised by Trend Micro Vision One Workbench.

• Effort: master

Trend Micro Vision One Workbench Medium Severity Alert

Detects when a medium alert severity is raised by Trend Micro Vision One Workbench.

• Effort: master

Trend Micro Vision One Workbench high Severity Alert

Detects when a high alert severity is raised by Trend Micro Vision One Workbench.

• Effort: master

Trickbot Malware Activity

Detects Trickbot malware process tree pattern in which rundll32.exe is parent of wermgr.exe.

• Effort: intermediate

Turla Named Pipes

Detects a named pipe used by Turla group samples. Prerequisites: Logging for PipeEvents is needed in Sysmon config

• Effort: elementary

Venom Multi-hop Proxy agent detection

Detects Venom Multi-hop Proxy agent.

• Effort: intermediate

WMI DLL Loaded Via Office

Detects Windows Management Instrumentation (WMI) DLL loaded via Office process. This activity may correspond to VBA macro executing WMI commands, which is highly suspicious. The prerequisite is to log Loaded DLLs images, which can be done with the Sysmon Event ID 7 (DLL image loaded by process).

• Effort: master

WMIC Uninstall Product

Detects products being uninstalled using WMIC command.

• Effort: intermediate

• Changelog:

  • 13/02/2024 - minor - Exclude non-Windows operating systems (false positives)

WMImplant Hack Tool

WMImplant is a powershell framework used by attacker for reconnaissance and exfiltration, this rule attempts to detect WMimplant arguments and invokes commands.

• Effort: intermediate

• Changelog:

  • 29/11/2023 - minor - Added a selection to filter some false positives.
  • 26/03/2024 - major - Rule's pattern field changed

Web Application Launching Shell

Detects when a web application launches a shell.

• Effort: master

• Changelog:

  • 10/10/2024 - major - Adding new elements and filters to increase detection and reduce false positives.

WithSecure Elements Critical Severity

WithSecure Elements has several modules. One constant is the severity of a raised event, which can be critical and therefore interesting to look at.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

WithSecure Elements Warning Severity

Detects when WithSecure Elements raised an event with a warning (and is not blocked or quarantined).

• Effort: master

XSL Script Processing And SquiblyTwo Attack

Detection of an attack where adversaries may bypass application control and obscure execution of code by embedding scripts inside XSL files. Another variation of this technique, dubbed "Squiblytwo", involves to invoke JScript or VBScript within an XSL file.

• Effort: intermediate

Zscaler ZIA Malicious Threat Outbreak

Spots a peak of malicious threat detection by Zscaler ZIA

• Effort: master

Zscaler ZIA Suspicious Threat Outbreak

Spots a peak of malicious threat detection by Zscaler ZIA

• Effort: master

Scripting

Suspicious VBS Execution Parameter

Detects suspicious VBS file execution with a specific parameter by cscript. It was observed in the Operation CloudHopper.

• Effort: elementary

Rundll32

PowerShell Execution Via Rundll32

Detects PowerShell Strings applied to rundll as seen in PowerShdll.dll Rule modified

• Effort: intermediate

PowerShell

In-memory PowerShell

Detects loading of essential DLL used by PowerShell, but not by the process powershell.exe. Detects meterpreter's "load powershell" extension and tool such PowerShDll.

• Effort: master

Shared Modules

FoggyWeb Backdoor DLL Loading

Detects DLL image load activity as used by the threat group NOBELIUM with the FoggyWeb backdoor loader. The prerequisite is to log Loaded DLLs images, which can be done through the Sysmon Event ID 7 (DLL image loaded by process).

• Effort: master

CMSTP

CMSTP Execution

Detects various indicators of Microsoft Connection Manager Profile Installer execution

• Effort: intermediate

• Changelog:

  • 19/10/2023 - minor - Slight change in selection to reduce false positives. Adding similarity.

MOFComp Execution

Detects rare usage of the Managed Object Format (MOF) compiler on Microsoft Windows. This could be abused by some attackers to load WMI classes.

• Effort: intermediate

Exploitation for Client Execution

Antivirus Exploitation Framework Detection

Detects a highly relevant Antivirus alert that reports an exploitation framework. This is based on Windows Defender logs (Event ID 1116 and 1117).

• Effort: elementary

Antivirus Password Dumper Detection

Detects a highly relevant Antivirus alert that reports a password dumper. This detection relies on Windows Defender events logs. This is based on Windows Defender logs (Event ID 1116 and 1117).

• Effort: elementary

Antivirus Relevant File Paths Alerts

Detects an Antivirus alert in a highly relevant file path or with a relevant file name. This is only based on Windows Defender events.

• Effort: intermediate

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.
  • 26/03/2024 - major - Rule's pattern field changed

Audit CVE Event

Detects events generated by Windows to indicate the exploitation of a known vulnerability.

• Effort: elementary

• Changelog:

  • 15/07/2024 - major - review filter and improve similarity

Download Files From Non-Legitimate TLDs

Detects file downloads from non-legitimate TLDs. Additional legitimates TLDs should be filtered according to the business habits.

• Effort: master

Download Files From Suspicious TLDs

Detects download of certain file types from hosts in suspicious TLDs

• Effort: master

Exploit For CVE-2015-1641

Detects Winword process starting uncommon sub process MicroScMgmt.exe as used in exploits for CVE-2015-1641

• Effort: elementary

Msdt (Follina) File Browse Process Execution

Detects various Follina vulnerability exploitation techniques. This is based on the Compatability Troubleshooter which is abused to do code execution.

• Effort: elementary

• Changelog:

  • 14/10/2024 - minor - Added filter to the rule to reduce false positives.
  • 19/06/2023 - minor - Added filter to the rule to reduce false positives.

Suspicious Hangul Word Processor Child Process

Detects suspicious Hangul Word Processor (HWP) child process that could indicate an exploitation as used by the Lazarus APT during the Operation Ghost Puppet (2018). This activity could correspond to a maldoc execution related to a .hwp file. Hangul is a proprietary word processing application that supports the Korean written language.

• Effort: elementary

Suspicious New Printer Ports In Registry

Detects a suspicious printer port creation in Registry that could be an attempt to exploit CVE-2020-1048. The CVE-2020-1048 consists in gaining persistence, privilege by abusing a flaw in the Print Spooler service to execute a payload whose path is stored in the registry key. To fully use this rule, prerequesites are logging for Registry events in the Sysmon configuration (events 12, 13 and 14).

• Effort: master

User Execution

AWS GuardDuty High Severity Alert

GuardDuty has detected a threat with a high severity level. A High severity level indicates that the resource in question (an EC2 instance or a set of IAM user sign-in credentials) is compromised and is actively being used for unauthorized purposes.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

AWS GuardDuty Low Severity Alert

GuardDuty has detected a threat with a low severity level. A low severity level indicates attempted suspicious activity that did not compromise your network, for example, a port scan or a failed intrusion attempt.

• Effort: master

AWS GuardDuty Medium Severity Alert

GuardDuty has detected a threat with a medium severity level. A Medium severity level indicates suspicious activity that deviates from normally observed behavior and, depending on your use case, may be indicative of a resource compromise.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Alert High Severity Sesame it Jizo NDR

Detects a high severity alert raised by SesameIT.

• Effort: master

Bitdefender GravityZone Endpoint Detection

Bitdefender GravityZone detected a malicious activity on an endpoint

• Effort: master

Broadcom/Symantec Endpoint Security Event Blocked

Broadcom/Symantec Endpoint Security blocked an action. Careful when activating this rule, it generates lots of events that are not always relevant for detection.

• Effort: master

Broadcom/Symantec Endpoint Security Event Cleaned

Broadcom/Symantec Endpoint Security had cleaned action. Careful when activating this rule, it generates lots of events that are not always relevant for detection.

• Effort: master

Broadcom/Symantec Endpoint Security Event Quarantined

Broadcom/Symantec Endpoint Security had a quarantined action. Careful when activating this rule, it generates lots of events that are not always relevant for detection.

• Effort: master

Broadcom/Symantec Endpoint Security Event Terminate

Broadcom/Symantec Endpoint Security had a process terminate action. Careful when activating this rule, it generates lots of events that are not always relevant for detection.

• Effort: master

Cobalt Strike Default Beacons Names

Detects the default names of Cobalt Strike beacons / payloads.

• Effort: intermediate

• Changelog:

  • 20/09/2024 - minor - Added new filters to reduce false positives.
  • 27/05/2024 - minor - Added new filters to reduce false positives.
  • 21/11/2023 - minor - Added new filters to reduce false positives.
  • 08/11/2023 - minor - Added filter to reduce false positives

CrowdStrike Falcon Identity Protection Detection Critical Severity

CrowdStrike Falcon raised an alert for an Identity-based detection with critical severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Identity Protection Detection High Severity

CrowdStrike Falcon raised an alert for an Identity-based detection with high severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Identity Protection Detection Informational Severity

CrowdStrike Falcon raised an alert for an Identity-based detection with informational severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Identity Protection Detection Low Severity

CrowdStrike Falcon raised an alert for an Identity-based detection with low severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Identity Protection Detection Medium Severity

CrowdStrike Falcon raised an alert for an Identity-based detection with medium severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection

CrowdStrike Falcon agent raised an alert for an intrusion detection

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection Critical Severity

CrowdStrike Falcon agent raised an alert for an intrusion detection with critical severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection High Severity

CrowdStrike Falcon agent raised an alert for an intrusion detection with high severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection Informational Severity

CrowdStrike Falcon agent raised an alert for an intrusion detection with informational severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection Low Severity

CrowdStrike Falcon agent raised an alert for an intrusion detection with low severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection Medium Severity

CrowdStrike Falcon agent raised an alert for an intrusion detection with medium severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Cybereason EDR Alert

Cybereason EDR telemetry has raised an alert

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Cybereason EDR Malware Detection

Cybereason EDR telemetry has detected a malware

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Darktrace Threat Visualizer Model Breach Critical Activity

Darktrace Threat Visualizer has detected a network critical activity related to one supervised device

• Effort: master

• Changelog:

  • 12/11/2024 - minor - Update name, description, similarity and severity

Darktrace Threat Visualizer Model Breach Suspicious Activity

Darktrace Threat Visualizer has detected a network critical activity related to one supervised device

• Effort: master

• Changelog:

  • 12/11/2024 - minor - Update name, description, similarity and severity

Darktrace Threat Visualizer Threat Critical Alert

Darktrace Threat Visualizer has raised a threat critical alert related to one supervised device

• Effort: master

Darktrace Threat Visualizer Threat Suspicious Alert

Darktrace Threat Visualizer has raised a threat suspicious alert related to one supervised device

• Effort: master

Download Files From Non-Legitimate TLDs

Detects file downloads from non-legitimate TLDs. Additional legitimates TLDs should be filtered according to the business habits.

• Effort: master

Download Files From Suspicious TLDs

Detects download of certain file types from hosts in suspicious TLDs

• Effort: master

ESET Protect Intrusion Detection

Detects when the solution ESET Protect detects an intrusion.

• Effort: master

EfficientIP SOLIDServer Suspicious Behavior

Detects when EfficientIP SOLIDServer forwards a suspicious behavior related to an IP.

• Effort: master

Exploit For CVE-2015-1641

Detects Winword process starting uncommon sub process MicroScMgmt.exe as used in exploits for CVE-2015-1641

• Effort: elementary

Explorer Process Executing HTA File

Detects a suspicious execution of an HTA file by the explorer.exe process. This unusual activity was observed when running IcedID malspam.

• Effort: intermediate

Gatewatcher AionIQ V103 Malcore

Detects a malcore alert by Gatewatcher AionIQ V103 related to documents with passwords.

• Effort: master

Google Workspace Anomaly File Downloads

Detects a large number of file downloads.

• Effort: master

• Changelog:

  • 12/06/2024 - minor - Changing effort level and adding field to alert.

HTA Infection Chains

Detect the creation of a ZIP file and an HTA file as it is often used in infection chains. Furthermore it also detects the use of suspicious processes launched by explorer.exe combined with the creation of an HTA file, since it is also often used in infection chains (LNK - HTA for instance).

• Effort: advanced

• Changelog:

  • 04/12/2024 - minor - Event type fields and file paths added to filter some false positives, and effort level changed.
  • 20/09/2024 - minor - File paths added to filter some false positives.
  • 19/09/2024 - minor - File paths added to filter some false positives.
  • 30/11/2023 - minor - Update pattern with new lolbin

HarfangLab EDR Critical Level Rule Detection

HarfangLab EDR has raised an alert based on a critical level rule (not using hlai engine)

• Effort: master

• Changelog:

  • 23/05/2024 - minor - Added filter to exclude threat dataset

HarfangLab EDR Critical Threat

HarfangLab EDR detected a threat with a critical level. This detection by the EDR is based on several detection rules.

• Effort: master

HarfangLab EDR High Level Rule Detection

HarfangLab EDR has raised an alert based on a high level rule (not using hlai engine)

• Effort: master

• Changelog:

  • 23/05/2024 - minor - Added filter to exclude threat dataset

HarfangLab EDR High Threat

HarfangLab EDR detected a threat with a high level. This detection by the EDR is based on several detection rules.

• Effort: master

HarfangLab EDR Hlai Engine Detection

HarfangLab EDR has raised an alert based on its hlai engine

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

HarfangLab EDR Low Level Rule Detection

HarfangLab EDR has raised an alert based on a low level rule (not using hlai engine)

• Effort: master

• Changelog:

  • 23/05/2024 - minor - Added filter to exclude threat dataset

HarfangLab EDR Low Threat

HarfangLab EDR detected a threat with a low level. This detection by the EDR is based on several detection rules.

• Effort: master

HarfangLab EDR Medium Level Rule Detection

HarfangLab EDR has raised an alert based on a medium level rule (not using hlai engine)

• Effort: master

• Changelog:

  • 23/05/2024 - minor - Added filter to exclude threat dataset

HarfangLab EDR Medium Threat

HarfangLab EDR detected a threat with a medium level. This detection by the EDR is based on several detection rules.

• Effort: master

HarfangLab EDR Process Execution Blocked (HL-AI engine)

HarfangLab EDR's machine learning malware detection module (HL-AI) has detected a suspicious binary and blocked its execution. To know more on what caused this alert, you should check the value of the process name and the concerned computer and user.

• Effort: master

• Changelog:

  • 10/01/2024 - major - Account for all blocks instead of only "Startup blocked". Rule name explicitly mentions HL-AI engine.
  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

HarfangLab EDR Suspicious Process Behavior Has Been Detected

HarfangLab EDR has detected a suspicious process behavior based on its detection rule. Check the rule name and description for more information.

• Effort: master

ISO LNK Infection Chain

Detection of an ISO (or any other similar archive file) downloaded file, followed by a child-process of explorer, which is characteristic of an infection using an ISO containing an LNK file. For events with host.name.

• Effort: intermediate

• Changelog:

  • 25/11/2024 - minor - Updating filter on file change and deletion
  • 18/11/2024 - minor - Updating filter on file change and deletion
  • 09/10/2024 - minor - File paths added to filter some false positives.
  • 20/09/2024 - minor - File paths added to filter some false positives.
  • 19/09/2024 - minor - File paths added to filter some false positives.
  • 18/09/2023 - minor - File paths added to filter some false positives.
  • 13/03/2023 - minor - Extended the list of suspicious process names being spawned from explorer.exe

IcedID Execution Using Excel

Detects Excel spawning a process (rundll32 or wmic) running suspicious command-line. This behaviour could correspond to IcedID activity.

• Effort: elementary

Lacework Cloud Security Critical Severity Alert

Detects when a critical alert severity is raised by Lacework. This severity level might indicates a suspicious change in configuration or policy violation.

• Effort: master

Lacework Cloud Security High Severity Alert

Detects when a high alert severity is raised by Lacework. This severity level might indicates a suspicious change in configuration or policy violation.

• Effort: master

Lacework Cloud Security Low Severity Alert

Detects when a low alert severity is raised by Lacework. This severity level might indicates a change in configuration that could be malicious or not.

• Effort: master

Lacework Cloud Security Medium Severity Alert

Detects when a medium alert severity is raised by Lacework. This severity level might indicates a suspicious activity such as new source from user connection.

• Effort: master

Login Brute-Force Successful On SentinelOne EDR Management Console

A user has attempted to login several times (brute-force) on the SentinelOne EDR Management Console and succeeded to login.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Login Failed Brute-Force On SentinelOne EDR Management Console

A user has attempted to login several times (brute-force) on the SentinelOne EDR Management Console and failed every time.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

MS Office Product Spawning Exe in User Dir

Detects an executable in the users directory started from Microsoft Word, Excel, Powerpoint, Publisher or Visio. This is a common technique used by attackers with documents embedding macros. It requires Windows command line logging events.

• Effort: master

• Changelog:

  • 10/08/2023 - minor - Rule modified and filter added to reduce false positives.
  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Malspam Execution Registering Malicious DLL

Detects the creation of a file in the C:\Datop folder, or DLL registering a file in the C:\Datop folder. Files located in the Datop folder are very characteristic of malspam execution related to Qakbot or SquirrelWaffle. Prerequisites are Logging for File Creation events, which can be done in the Sysmon configuration (events 11), for the first part of the pattern (TargetFilename).

• Effort: elementary

Malware Detected By Vade For M365

Vade Secure product Vade for M365 has detected a malware contained in the message.

• Effort: master

Malware Detected By Vade For M365 And Not Blocked

Vade Secure product Vade for M365 has detected a malware contained in the message and didn't delete it.

• Effort: advanced

Malware Outbreak

Spots a peak of malware detection by windows defender on this perimeter.

• Effort: advanced

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Microsoft 365 (Office 365) Anti-Phishing Policy Deletion

Detects when the anti-phishing policy is removed from Microsoft 365 (Office 365). By default, Microsoft 365 (Office 365) includes built-in features that help protect users from phishing attacks. This policy specifies the phishing protections to enable or disable, and the actions to apply options.

• Effort: master

Microsoft 365 (Office 365) Anti-Phishing Rule Deletion

Detects the deactivation of the anti-phishing rule from Microsoft 365 (Office 365). The anti-phishing rule specifies the priority and recipient filters (who the policy applies to) for an anti-phish policy.

• Effort: master

Microsoft 365 (Office 365) AtpDetection

Detects when an AtpDetection (Advanced Threat Protection) event from the Office365 ThreatIntelligence service is raised. AtpDetection is a service which secures emails, attachments, and files by scanning them for threats.

• Effort: intermediate

Microsoft 365 (Office 365) DLP Policy Removed

Detects when a DLP (Data Loss Prevention) policy is removed in Microsoft 365 (Office 365). DLP policies defines which resources can be shared and with whom, preventing sensitive information from being leaked.

• Effort: master

Microsoft 365 (Office 365) MCAS Detection Velocity

Detects when Microsoft Cloud App Security identifies two user activities (a single or multiple sessions) originating from geographically distant locations within a time period shorter than the time it would have taken the user to travel from the first location to the second. To use this feature, you must have an Microsoft 365 (Office 365) E5 license (https://docs.microsoft.com/en-us/defender-cloud-apps/get-started?culture=fr-fr&country=FR).

• Effort: master

Microsoft 365 (Office 365) MCAS Inbox Hiding

Detects when Microsoft Cloud App Security identifies that a suspicious inbox rule was set on a user’s inbox. This may indicate that the user account is compromised, and that the mailbox is being used to distribute spam and malware in your organization. To use this feature, you must have an Microsoft 365 (Office 365) E5 license (https://docs.microsoft.com/en-us/defender-cloud-apps/get-started?culture=fr-fr&country=FR).

• Effort: master

Microsoft 365 (Office 365) MCAS New Country

Detects when Microsoft Cloud App Security identifies a sign-in from a country where it has never connected. To use this feature, you must have an Microsoft 365 (Office 365) E5 license (https://docs.microsoft.com/en-us/defender-cloud-apps/get-started?culture=fr-fr&country=FR).

• Effort: master

Microsoft 365 (Office 365) MCAS Repeated Delete

Detects when Microsoft Cloud App Security identifies that a user has deleted an unusually large volume of files. To use this feature, you must have an Microsoft 365 (Office 365) E5 license (https://docs.microsoft.com/en-us/defender-cloud-apps/get-started?culture=fr-fr&country=FR).

• Effort: master

Microsoft 365 (Office 365) MCAS Repeated Failed Login

Detects when Microsoft Cloud App Security identifies a large number of failed login attempts which may indicate a brute-force attempt. To use this feature, you must have an Microsoft 365 (Office 365) E5 license (https://docs.microsoft.com/en-us/defender-cloud-apps/get-started?culture=fr-fr&country=FR).

• Effort: master

Microsoft 365 (Office 365) MCAS Risky IP

Detects when Microsoft Cloud App Security identifies sign-ins from a risky IP address, for example, using an anonymous browser or VPN. To use this feature, you must have an Microsoft 365 (Office 365) E5 license (https://docs.microsoft.com/en-us/defender-cloud-apps/get-started?culture=fr-fr&country=FR).

• Effort: master

Microsoft 365 (Office 365) MailBoxAuditBypassAssociation Option Implementation

Detects the implementation of a MailBoxAuditBypassAssociation option in Microsoft 365 (Office 365). This option is used when you configure a user or computer account to bypass mailbox audit logging, access or actions taken by the user or computer account to any mailbox isn't logged.

• Effort: master

Microsoft 365 (Office 365) Malware Filter Policy Removed

Detects when a malware policy has been deleted in Microsoft 365 (Office 365). A malware filter policy is used to alert administrators that an internal user sent a message that contained malware.

• Effort: master

Microsoft 365 (Office 365) Malware Filter Rule Deletion

Detects when a malware filter rule has been deleted in Microsoft 365 (Office 365). The malware filter rule specifies the priority and recipient filters (who the policy applies to) for a malware filter policy.

• Effort: master

Microsoft 365 (Office 365) Malware Uploaded On OneDrive

Detects when Microsoft 365 (Office 365) identifies a malicious file uploaded to OneDrive. Attackers can use this method to propagate through the network.

• Effort: intermediate

Microsoft 365 (Office 365) Malware Uploaded On SharePoint

Detects when Microsoft 365 (Office 365) identifies a malicious file uploaded to SharePoint. Attackers can use this method to propagate through the network.

• Effort: intermediate

Microsoft 365 (Office 365) Mass Download By A Single User

Identifies when Microsoft Cloud App Security reports that a single user performs more than 50 downloads within 1 minute.

• Effort: master

• Changelog:

  • 09/10/2023 - major - Fix field names to match the current parser.

Microsoft 365 (Office 365) Potential Ransomware Activity Detected

Detects when Microsoft Cloud App Security reports that a user has uploaded files to the cloud that might be infected with ransomware.

• Effort: master

• Changelog:

  • 09/10/2023 - major - Fix field names to match the current parser.

Microsoft 365 (Office 365) Safe Attachment Rule Disabled

Detects when the safe attachment rule has been deleted in Microsoft 365 (Office 365). Safe Attachments is a feature in Microsoft Defender for Microsoft 365 (Office 365) that opens email attachments in a special hypervisor environment to detect malicious activity.

• Effort: master

Microsoft 365 (Office 365) Safelinks Disabled

Detects when a safelink rule has been deleted in Microsoft 365 (Office 365). Safe Links is a feature in Defender for Microsoft 365 (Office 365) that provides URL scanning and rewriting of inbound email messages in mail flow, and time-of-click verification of URLs and links in email messages and other locations.

• Effort: master

Microsoft 365 (Office 365) Unusual Volume Of File Deletion

Detects when Microsoft Cloud App Security identifies that a user has deleted an unusually large volume of files.

• Effort: master

• Changelog:

  • 09/10/2023 - major - Fix field names to match the current parser.

Microsoft Defender Antivirus Threat Detected

Detection of a windows defender alert indicating the presence of potential malware

• Effort: advanced

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.
  • 26/03/2024 - major - Rule's pattern field changed

Microsoft Defender XDR Alert

Microsoft Defender XDR has raised an alert. The alert info and evidence events are grouped with the similarity into the same Sekoia.io alert.

• Effort: master

• Changelog:

  • 13/09/2024 - major - Update service name value following Microsoft change

Microsoft Defender XDR Cloud App Security Alert

Microsoft Defender XDR has raised an alert for Microsoft Cloud App Security. The alert info and evidence events are grouped with the similarity into the same Sekoia.io alert.

• Effort: master

• Changelog:

  • 13/09/2024 - major - Update service name value following Microsoft change

Microsoft Defender XDR Endpoint Alert

Microsoft Defender XDR has raised an alert for Microsoft Defender for Endpoint. The alert info and evidence events are grouped with the similarity into the same Sekoia.io alert.

• Effort: master

Microsoft Defender XDR Office 365 Alert

Microsoft Defender XDR for Office 365 has raised an alert. The alert info and evidence events are grouped with the similarity into the same Sekoia.io alert.

• Effort: master

Microsoft Office Creating Suspicious File

Detects Microsoft Office process (word, excel, powerpoint) creating a suspicious file which corresponds to a script or an executable. This behavior highly corresponds to an executed macro which loads an installation script or a malware payload. The rule requires to log for File Creations to work properly, which can be done through Sysmon Event ID 11.

• Effort: master

Microsoft Office Product Spawning Windows Shell

Detects a Windows command or scripting interpreter executable started from Microsoft Word, Excel, Powerpoint, Publisher and Visio. This typically indicates the parent process launched a malicious macro, or run an exploit. This infection vector is very common and could lead to the deployment of harmful malware.

• Effort: master

• Changelog:

  • 23/01/2024 - minor - Adding elements to increase detection and filters to reduce false positives.
  • 13/09/2024 - major - Adding filters to reduce false positives and updated the effort level to master as it is a rule highly dependent on the environment.

Microsoft Office Spawning Script

Detects Microsoft Office process (word, excel, powerpoint) spawning wscript.exe or cscript.exe. This typically indicates the parent process launched a malicious macro, or run an exploit. This infection vector is very common and could lead to the deployment of harmful malware.

• Effort: intermediate

Okta Security Threat Detected

Detects when a security threat is detected in Okta.

• Effort: intermediate

Palo Alto Cortex XDR (EDR) Alert Not Blocked (High Severity)

A Palo Alto Cortex XDR (EDR) agent has raised an alert of high severity that was not blocked.

• Effort: master

Palo Alto Cortex XDR (EDR) Alert Not Blocked (Low Severity)

A Palo Alto Cortex XDR (EDR) agent has raised an alert of low severity that was not blocked.

• Effort: master

Palo Alto Cortex XDR (EDR) Alert Not Blocked (Medium Severity)

A Palo Alto Cortex XDR (EDR) agent has raised an alert of medium severity that was not blocked.

• Effort: master

SentinelOne EDR Agent Disabled

A SentinelOne EDR agent has been disabled according to SentinelOne logs.

• Effort: master

SentinelOne EDR Custom Rule Alert

A SentinelOne EDR agent has detected a threat related to a Custom Rule and raised an alert for it.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Malicious Threat Detected And Mitigated Preemptively

A SentinelOne EDR agent has detected a malicious threat which has been mitigated preemptively, defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Malicious Threat Not Mitigated

A SentinelOne EDR agent has detected a threat but did not mitigate it, defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR SSO User Added

A SSO User was added.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Suspicious Threat Not Mitigated (Medium Confidence)

A SentinelOne EDR agent has detected a threat with a medium confidence level (suspicious) but did not mitigate it. This is all defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Detected (Malicious)

A SentinelOne EDR agent has detected a threat with a high confidence level (malicious).

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Detected (Suspicious)

A SentinelOne EDR agent has detected a threat with a medium confidence level (suspicious).

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Mitigation Report Kill Success

A SentinelOne EDR agent has detected and killed a threat (usually kills the malicious process), defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Mitigation Report Quarantine Failed

A SentinelOne EDR agent has failed to quarantine a threat, defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Mitigation Report Quarantine Success

A SentinelOne EDR agent has detected and quarantined a threat with success, defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Mitigation Report Remediate Success

A SentinelOne EDR agent has remediated a threat, defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR User Failed To Log In To The Management Console

A user has failed to log in to the management console.

• Effort: master

SentinelOne EDR User Logged In To The Management Console

A user has logged in to the management console.

• Effort: master

• Changelog:

  • 24/03/2023 - minor - Adjusting displayed columns when the rule triggers an alert. Now timestamp and username will be displayed.

Sophos EDR Application Blocked

Sophos EDR detected a potentially malicious application and blocked it.

• Effort: master

Sophos EDR Application Detected

Sophos EDR detected a potentially malicious application.

• Effort: master

Sophos EDR CorePUA Clean

Sophos EDR detected a potentially unwanted application and cleaned it.

• Effort: master

Sophos EDR CorePUA Detection

Sophos EDR detected a potentially unwanted application.

• Effort: master

SquirrelWaffle Malspam Execution Loading DLL

Detects cscript running suspicious command to load a DLL. This behavior has been detected in SquirrelWaffle campaign.

• Effort: intermediate

Stormshield Ses Critical Block

Stormshield Endpoint Security block execution with critical severity

• Effort: master

Stormshield Ses Critical Not Block

Stormshield Endpoint Security detect threat with critical severity that was not blocked

• Effort: master

Stormshield Ses Emergency Block

Stormshield Endpoint Security block execution with emergency severity

• Effort: master

Suspicious DLL Loaded Via Office Applications

Detects suspicious DLL being loaded by an Microsoft Office Product. Considered as suspects are some .NET DLLs, clr.dll, GAC DLL, DSParse (Active Directoryi services API) or Kerberos DLLs which may be loaded by MS Office processes when executing a potentially malicious macro. The prerequisite is to log the Sysmon Event ID 7 (DLL image loaded by process).

• Effort: master

Suspicious Outlook Child Process

Detects suspicious child processes of Microsoft Outlook. These child processes are often associated with spearphishing activity.

• Effort: intermediate

Sysmon Windows File Block Executable

Sysmon has blocked an executable file from being written to the disk. This could be a malicious binary to investigate.

• Effort: master

TEHTRIS EDR Alert

Tehtris EDR telemetry has raised an alert.

• Effort: master

Trend Micro Apex One Data Loss Prevention Alert

Trend Micro Apex One has raised an alert for data loss prevention.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Trend Micro Apex One Malware Alert

Trend Micro Apex One has detected a malware.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Trend Micro Vision One Workbench Critical Severity Alert

Detects when a critical alert severity is raised by Trend Micro Vision One Workbench.

• Effort: master

Trend Micro Vision One Workbench Low Severity Alert

Detects when a low alert severity is raised by Trend Micro Vision One Workbench.

• Effort: master

Trend Micro Vision One Workbench Medium Severity Alert

Detects when a medium alert severity is raised by Trend Micro Vision One Workbench.

• Effort: master

Trend Micro Vision One Workbench high Severity Alert

Detects when a high alert severity is raised by Trend Micro Vision One Workbench.

• Effort: master

Vectra General Threat Detection

Vectra Cognito detected a potential threat. This is a very generic rule to raise as much alerts as possible from Vectra detections however RECONNAISSANCE and INFO categories have been removed to avoid spamming.

• Effort: master

Winword Document Droppers

Detects specific process characteristics of word document droppers. This techniques has been used by Maze ransomware operators.

• Effort: elementary

WithSecure Elements Critical Severity

WithSecure Elements has several modules. One constant is the severity of a raised event, which can be critical and therefore interesting to look at.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

WithSecure Elements Warning Severity

Detects when WithSecure Elements raised an event with a warning (and is not blocked or quarantined).

• Effort: master

ZIP LNK Infection Chain

Detection of an ZIP download followed by a child-process of explorer, followed by multiple Windows processes.This is widely used as an infection chain mechanism.

• Effort: advanced

• Changelog:

  • 18/11/2024 - minor - Filter modified to avoid some false positives.
  • 19/09/2024 - minor - File paths added to filter some false positives.

Zscaler ZIA Malicious Threat

Zscaler Internet Access has detected a network traffic as malicious

• Effort: master

Zscaler ZIA Malicious Threat Outbreak

Spots a peak of malicious threat detection by Zscaler ZIA

• Effort: master

Zscaler ZIA Suspicious Threat

Zscaler Internet Access has detected a network traffic as malicious

• Effort: master

Zscaler ZIA Suspicious Threat Outbreak

Spots a peak of malicious threat detection by Zscaler ZIA

• Effort: master

System Services

Bitdefender GravityZone Endpoint Detection

Bitdefender GravityZone detected a malicious activity on an endpoint

• Effort: master

Check Point Harmony Mobile Application Forbidden

Detects when someone attempts to access/use a forbidden application.

• Effort: master

Correlation Impacket Smbexec

This rule detects the execution of smbexec via the relevant share pattern name

• Effort: elementary

Credential Dumping Tools Service Execution

Detects well-known credential dumping tools execution via service execution

• Effort: intermediate

CrowdStrike Falcon Identity Protection Detection Critical Severity

CrowdStrike Falcon raised an alert for an Identity-based detection with critical severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Identity Protection Detection High Severity

CrowdStrike Falcon raised an alert for an Identity-based detection with high severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Identity Protection Detection Informational Severity

CrowdStrike Falcon raised an alert for an Identity-based detection with informational severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Identity Protection Detection Low Severity

CrowdStrike Falcon raised an alert for an Identity-based detection with low severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Identity Protection Detection Medium Severity

CrowdStrike Falcon raised an alert for an Identity-based detection with medium severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection

CrowdStrike Falcon agent raised an alert for an intrusion detection

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection Critical Severity

CrowdStrike Falcon agent raised an alert for an intrusion detection with critical severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection High Severity

CrowdStrike Falcon agent raised an alert for an intrusion detection with high severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection Informational Severity

CrowdStrike Falcon agent raised an alert for an intrusion detection with informational severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection Low Severity

CrowdStrike Falcon agent raised an alert for an intrusion detection with low severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

CrowdStrike Falcon Intrusion Detection Medium Severity

CrowdStrike Falcon agent raised an alert for an intrusion detection with medium severity

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Csrss Child Found

The csrss.exe process (csrss stands for Client / Server Runtime Subsystem) is a generic Windows process used to manage windows and Windows graphics. This process should not create a child process or it is very rare.

• Effort: intermediate

• Changelog:

  • 16/12/2024 - minor - Improve pattern mandatory fields and add filter to reduce false positives

Csrss Wrong Parent

The csrss.exe process (csrss stands for Client / Server Runtime Subsystem) is a generic Windows process used to manage windows and Windows graphics. This rule analyse if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Cybereason EDR Alert

Cybereason EDR telemetry has raised an alert

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Cybereason EDR Malware Detection

Cybereason EDR telemetry has detected a malware

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Dllhost Wrong Parent

Dllhost.exe is a process belonging to Microsoft Windows Operating System. The dllhost.exe file manages DLL based applications. This rule analyse if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Some filters on parent process names were also added to reduce false positives.

Exfiltration Via Pscp

Detects the use of pscp which is a file sharing services.

• Effort: advanced

Gpscript Suspicious Parent

Gpscript defines GPO scripts for users and applies them to login / logout sessions. This rule checks if the parent of this process is the supposed one (svchost) or not.

• Effort: intermediate

• Changelog:

  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives

Login Brute-Force Successful On SentinelOne EDR Management Console

A user has attempted to login several times (brute-force) on the SentinelOne EDR Management Console and succeeded to login.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Login Failed Brute-Force On SentinelOne EDR Management Console

A user has attempted to login several times (brute-force) on the SentinelOne EDR Management Console and failed every time.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Logonui Wrong Parent

Logonui.exe is a file associated with the Logon user interface. The login user interface is an essential part of the Windows operating system. It doesn't only make it easy for the user to log in to the PC but also determines whether the user has logged in and logged out correctly and makes it easy to switch between users. This rule checks if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 07/06/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake

Lsass Wrong Parent

Lsass ensures the identification of users (domain users or local users). Domain users are identified based on information in the Active Directory. Local users are identified based on information from the Security Account Manager (SAM) local database. This rule checks if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - The rule has been reworked for a specific intake to allow our customers to activate the rule for this intake which was not the case before.

Malicious Service Installations

Generic and known malicious service installation that appear in cases of lateral movement, credential dumping and other suspicious activity. It detects the use of PAExec, Wannacry commonly used malicious service, APT29 known malicious service name and net user service file name which is known as a sign of persistence.

• Effort: elementary

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Malware Outbreak

Spots a peak of malware detection by windows defender on this perimeter.

• Effort: advanced

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Metasploit PSExec Service Creation

Detects Metasploit service creation when using the PSExec module. The ImagePath here is usually a malicious command line using powershell.exe and/or cmd.exe.

• Effort: advanced

Microsoft Defender Antivirus Threat Detected

Detection of a windows defender alert indicating the presence of potential malware

• Effort: advanced

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.
  • 26/03/2024 - major - Rule's pattern field changed

Microsoft Defender XDR Alert

Microsoft Defender XDR has raised an alert. The alert info and evidence events are grouped with the similarity into the same Sekoia.io alert.

• Effort: master

• Changelog:

  • 13/09/2024 - major - Update service name value following Microsoft change

Microsoft Defender XDR Cloud App Security Alert

Microsoft Defender XDR has raised an alert for Microsoft Cloud App Security. The alert info and evidence events are grouped with the similarity into the same Sekoia.io alert.

• Effort: master

• Changelog:

  • 13/09/2024 - major - Update service name value following Microsoft change

Microsoft Defender XDR Endpoint Alert

Microsoft Defender XDR has raised an alert for Microsoft Defender for Endpoint. The alert info and evidence events are grouped with the similarity into the same Sekoia.io alert.

• Effort: master

Microsoft Defender XDR Office 365 Alert

Microsoft Defender XDR for Office 365 has raised an alert. The alert info and evidence events are grouped with the similarity into the same Sekoia.io alert.

• Effort: master

Mshta Command From A Scheduled Task

Detects when an attacker leverage the Microsoft Windows Scheduled task feature to run the mshta.exe process. This is a common usage of a living-off-the-land binary, frequently abused for malicous purposes and not common nowadays in IT administration.

• Effort: intermediate

Okta Security Threat Detected

Detects when a security threat is detected in Okta.

• Effort: intermediate

OneNote Suspicious Children Process

In January 2023, a peak of attacks using .one files was observed in the wild. This rule tries to detect the effect of such attempts using this technique.

• Effort: advanced

• Changelog:

  • 15/04/2024 - minor - Changing effort level and adding new filters to reduce false positives.

PsExec Process

Detects PsExec execution, command line which contains pstools or installation of the PsExec service. PsExec is a SysInternals which can be used to execute a program on another computer. The tool is as much used by attackers as by administrators.

• Effort: advanced

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Rare Logonui Child Found

Logonui.exe is a file associated with the Logon user interface. The login user interface is an essential part of the Windows operating system. It not only makes it easy for the user to log in to the PC but also determines whether the user has logged in and logged out correctly and makes it easy to switch between users. This process could create a child process but it is very rare and could be a signal of some process injection.

• Effort: advanced

Rare Lsass Child Found

Lsass ensures the identification of users (domain users or local users). Domain users are identified based on information in the Active Directory. Local users are identified based on information from the Security Account Manager (SAM) local database. This process should not create a child process or it is very rare.

• Effort: intermediate

Searchindexer Wrong Parent

Detects if the Search Indexer was executed by a non-legitimate parent process. Search Indexer is the Windows service that handles indexing of your files for Windows Search.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Searchprotocolhost Child Found

SearchProtocolHost.exe is part of the Windows Indexing Service, an application that indexes files from the local drive making them easier to search. This is a crucial part of the Windows operating system. This process should not create a child process or it is very rare.

• Effort: intermediate

Searchprotocolhost Wrong Parent

Detects if the Search Protocol Host process was executed by a non-legitimate parent process. Search Protocol Host is part of the Windows Indexing Service, a service indexing files on the local drive making them easier to search.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 12/03/2024 - minor - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake

SentinelOne EDR Agent Disabled

A SentinelOne EDR agent has been disabled according to SentinelOne logs.

• Effort: master

SentinelOne EDR Custom Rule Alert

A SentinelOne EDR agent has detected a threat related to a Custom Rule and raised an alert for it.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Malicious Threat Detected And Mitigated Preemptively

A SentinelOne EDR agent has detected a malicious threat which has been mitigated preemptively, defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Malicious Threat Not Mitigated

A SentinelOne EDR agent has detected a threat but did not mitigate it, defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR SSO User Added

A SSO User was added.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Suspicious Threat Not Mitigated (Medium Confidence)

A SentinelOne EDR agent has detected a threat with a medium confidence level (suspicious) but did not mitigate it. This is all defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Detected (Malicious)

A SentinelOne EDR agent has detected a threat with a high confidence level (malicious).

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Detected (Suspicious)

A SentinelOne EDR agent has detected a threat with a medium confidence level (suspicious).

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Mitigation Report Kill Success

A SentinelOne EDR agent has detected and killed a threat (usually kills the malicious process), defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Mitigation Report Quarantine Failed

A SentinelOne EDR agent has failed to quarantine a threat, defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Mitigation Report Quarantine Success

A SentinelOne EDR agent has detected and quarantined a threat with success, defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR Threat Mitigation Report Remediate Success

A SentinelOne EDR agent has remediated a threat, defined by the action.type field's value.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

SentinelOne EDR User Failed To Log In To The Management Console

A user has failed to log in to the management console.

• Effort: master

SentinelOne EDR User Logged In To The Management Console

A user has logged in to the management console.

• Effort: master

• Changelog:

  • 24/03/2023 - minor - Adjusting displayed columns when the rule triggers an alert. Now timestamp and username will be displayed.

Smbexec.py Service Installation

Detects the use of smbexec.py tool by detecting a specific service installation

• Effort: elementary

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Smss Wrong Parent

Detects if the Smss process was executed by a non-legitimate parent process. Session Manager Subsystem (smss) process is a component of the Microsoft Windows NT family of operating systems.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 05/04/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake

SolarWinds Suspicious File Creation

Detects SolarWinds process creating a file with a suspicious extension. The process solarwinds.businesslayerhost.exe created an unexpected file whose extension is ".exe", ".ps1", ".jpg", ".png" or ".dll".

• Effort: intermediate

SolarWinds Wrong Child Process

Detects SolarWinds process starting an unusual child process. Process solarwinds.businesslayerhost.exe and solarwinds.businesslayerhostx64.exe created an unexepected child process which doesn't correspond to the legitimate ones.

• Effort: intermediate

• Changelog:

  • 14/06/2023 - major - Reworking of the rule after many FPs and a more suitable Elastic rule
  • 22/12/2023 - minor - Adding a child process name to the filter list to avoid some FPs

Spoolsv Wrong Parent

Detects if the Spoolsv process was executed by a non-legitimate parent process. Printer Spooler Service (Spoolsv) process is responsible for managing spooled print/fax jobs.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Added some new filters as well to reduce false positives.

Suspicious Commands From MS SQL Server Shell

Detection of some shell commmands run from a cmd executed by Microsoft MS SQL Server. It could be a sign of xp_cmdshell allowed on the MS-SQL server.

• Effort: intermediate

Suspicious DNS Child Process

Detects suspicious processes spawned by the dns.exe process. It could be a great indication of the exploitation of the DNS RCE bug reported in CVE-2020-1350 (SIGRED).

• Effort: intermediate

Suspicious PsExec Execution

Detects execution of PsExec, different from the Sysinternals one. This rule helps to filter out the noise if PsExec is used for legit purposes or if attacker uses a different PsExec client other than Sysinternals one. The prerequisite is to log the Event ID 5145 (by setting "Audit Policy > Object Access > Audit Detailed File Share" to Success/Failure).

• Effort: master

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Svchost Wrong Parent

Detects if the svchost.exe process was executed by a non-legitimate parent process. Svchost (Service Host Process) is a generic host process name for services that run from dynamic-link libraries (DLLs).

• Effort: master

• Changelog:

  • 04/07/2023 - minor - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 31/01/2024 - minor - Adding filters to reduce false positives
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. A filter has also been added to reduce false positives.

TEHTRIS EDR Alert

Tehtris EDR telemetry has raised an alert.

• Effort: master

Taskhost Wrong Parent

Detects if the Taskhost process was executed by a non-legitimate parent process. Taskhost is the process of the Windows Task Manager which lists the processes that are currently running on the computer system.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Taskhost or Taskhostw Suspicious Child Found

Task Host manages pop-up windows when users try to close them in a Windows environment. Taskhost.exe triggers the host process for the task. Task Host is a Windows process designed to alert users when dialog boxes close. It is usually launched when restarting and shutting down a PC, and checks if all programs have been properly closed. This process should not create a child process or it is very rare.

• Effort: master

• Changelog:

  • 13/08/2024 - minor - Adding elements to filter to reduce false positives and changing effort level.

Taskhostw Wrong Parent

Detects if the Taskhostw process was executed by a non-legitimate parent process. Taskhostw is a software component of Windows service start manager, it starts DLL-based Windows services when the computer boots up.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Filters were also added to reduce false positives.

Trend Micro Apex One Data Loss Prevention Alert

Trend Micro Apex One has raised an alert for data loss prevention.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Trend Micro Apex One Malware Alert

Trend Micro Apex One has detected a malware.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Trend Micro Vision One Workbench Critical Severity Alert

Detects when a critical alert severity is raised by Trend Micro Vision One Workbench.

• Effort: master

Trend Micro Vision One Workbench Low Severity Alert

Detects when a low alert severity is raised by Trend Micro Vision One Workbench.

• Effort: master

Trend Micro Vision One Workbench Medium Severity Alert

Detects when a medium alert severity is raised by Trend Micro Vision One Workbench.

• Effort: master

Trend Micro Vision One Workbench high Severity Alert

Detects when a high alert severity is raised by Trend Micro Vision One Workbench.

• Effort: master

Usage Of Procdump With Common Arguments

Detects the usage of Procdump sysinternals tool with some common arguments and followed by common patterns.

• Effort: intermediate

• Changelog:

  • 15/01/2024 - minor - Added filter to reduce false positives.

Usage Of Sysinternals Tools

Detects the usage of Sysinternals Tools due to accepteula key being added to Registry. The rule detects it either from the command line usage or from the regsitry events. For the later prerequisite is logging for registry events in the Sysmon configuration (events 12 and 13).

• Effort: master

• Changelog:

  • 21/06/2024 - major - Update detection pattern for ECS fields/value compliance

WMI Persistence Command Line Event Consumer

Detects WMI command line event consumers.

• Effort: elementary

Windows Suspicious Service Creation

Detects the creation of a new suspicious service - attacker could use MSRPC to create a remote service

• Effort: intermediate

Windows Update LolBins

This rule try to detect a suspicious behavior of wuauclt.exe (windows update client) that could be a lolbins. Wuauctl.exe could be used to execute a malicious program.

• Effort: elementary

• Changelog:

  • 24/03/2023 - minor - The legitimate DLL UpdateDeploymentProvider.dll is now excluded from the rule as it triggered several false positives.

Wininit Wrong Parent

Windows Boot is a background application launcher for the Windows operating system. Wininit.exe is responsible for performing the Windows initialization process. This rule analyse if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. A filter was also added to reduce false positives.

Winlogon wrong parent

Winlogon.exe is a process that performs the Windows login management function, handling user login and logout in Windows. You see this process in action whenever the operating system asks you for your username and password. It is also responsible for loading user profiles after login, this supports automated login (when relevant) and keyboard and mouse inactivity monitoring to decide when to invoke the screen saver. This rule analyse if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Filter was also added to reduce false positives.

Winrshost Wrong Parent

Detects if the Winrshosts process was executed by a non-legitimate parent process The winrshost.exe is a Host Process for WinRM's Remote Shell plugin.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Filters were also added to reduce false positives.

WithSecure Elements Critical Severity

WithSecure Elements has several modules. One constant is the severity of a raised event, which can be critical and therefore interesting to look at.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

WithSecure Elements Warning Severity

Detects when WithSecure Elements raised an event with a warning (and is not blocked or quarantined).

• Effort: master

Wsmprovhost Wrong Parent

Detects if the Wsmprovhost process was executed by a non-legitimate parent process. The PowerShell host wsmprovhost.exe is a proxy process executed remotely through PowerShell when using Windows Remote Management (WinRM).

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 25/10/2023 - minor - Adding filter to reduce false positives.
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Zscaler ZIA Malicious Threat Outbreak

Spots a peak of malicious threat detection by Zscaler ZIA

• Effort: master

Zscaler ZIA Suspicious Threat Outbreak

Spots a peak of malicious threat detection by Zscaler ZIA

• Effort: master

Deploy Container

Docker Escape Bind Mount

Catch Docker escape via mount escape followed by chroot

• Effort: intermediate

Persistence

Boot or Logon Initialization Scripts

Logon Scripts (UserInitMprLogonScript)

Detects creation or execution of UserInitMprLogonScript persistence method. The rule requires to log for process command lines and registry creations or update, which can be done using Sysmon Event IDs 1, 12, 13 and 14.

• Effort: advanced

Scheduled Task/Job

BazarLoader Persistence Using Schtasks

Detects possible BazarLoader persistence using schtasks. BazarLoader will create a Scheduled Task using a specific command line to establish its persistence.

• Effort: intermediate

Blue Mockingbird Malware

Attempts to detect system changes made by Blue Mockingbird

• Effort: elementary

Chafer (APT 39) Activity

Detects previous Chafer (APT 39) activity attributed to OilRig as reported in Nyotron report in March 2018.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Creation or Modification of a GPO Scheduled Task

Detects lateral movement using GPO scheduled task, often used to deploy ransomware at scale. This rule is based on the EventID 5145 which is specific to Windows Servers. The advanced audit policy setting Object Access > Audit Detailed File Share must be configured for Success/Failure.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Cron Files Alteration

Cron Files and Cron Directory alteration used by attacker for persistency or privilege escalation. To ensure full performance on this rule, auditbeat intake must be configure with the module file_integrity containing path mentionned in the pattern.

• Effort: advanced

Google Workspace App Script Scheduled Task

Detects when a scheduled task is launched by Google App Script. This product is used to create scripts and integrate applications within Google Workspace.

• Effort: advanced

Qakbot Persistence Using Schtasks

Detects possible Qakbot persistence using schtasks.

• Effort: intermediate

Remote Task Creation Via ATSVC Named Pipe

Detects remote task creation via at.exe or API interacting with ATSVC Named Pipe. This requires Windows Security event logging with the File Share policy.

• Effort: intermediate

• Changelog:

  • 21/03/2024 - minor - change filter to ACL hex value

STRRAT Scheduled Task

Detect STRRAT when it achieves persistence by creating a scheduled task. STRRAT is a Java-based stealer and remote backdoor, it establishes persistence using this specific command line: 'cmd /c schtasks /create /sc minute /mo 30 /tn Skype /tr "C:\Users\Admin\AppData\Roaming\SAMPLENAME.jar"'

• Effort: intermediate

Schtasks Persistence With High Privileges

Detection of scheduled task with high privileges used by attacker for persistence.

• Effort: elementary

Schtasks Suspicious Parent

Detects schtasks started from suspicious and/or unusual processes.

• Effort: intermediate

Spyware Persistence Using Schtasks

Detects possible Agent Tesla or Formbook persistence using schtasks. The name of the scheduled task used by these malware is very specific (Updates/randomstring).

• Effort: intermediate

Suspicious Scheduled Task Creation

Detects suspicious scheduled task creation, either executed by a non-system user or a user who is not administrator (the user ID is not S-1-5-18 or S-1-5-18-*). This detection rule doesn't match Sysmon EventID 1 because the user SID is always set to S-1-5-18.

• Effort: intermediate

Windows Suspicious Scheduled Task Creation

The rule identify creation of new scheduled task who run suspicious or dangerous command

• Effort: intermediate

Registry Run Keys / Startup Folder

Malware Persistence Registry Key

Detects registry key used by several malware, especially Formbook spyware in two ways, either the Sysmon registry events, or the commands line.

• Effort: master

• Changelog:

  • 21/06/2024 - major - Update detection pattern for ECS fields/value compliance, and filter some FPs

Valid Accounts

Account Added To A Security Enabled Group

Detection in order to investigate who has added a specific Domain User in Domain Admins or Group Policy Creator Owners (Security event 4728)

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed
  • 12/07/2024 - minor - add similarity strategy

Account Removed From A Security Enabled Group

Detection in order to investigate who has removed a specific Domain User in Domain Admins or Group Policy Creator Owners (Security event 4729)

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed
  • 12/07/2024 - minor - Add similarity strategy

Account Tampering - Suspicious Failed Logon Reasons

This method uses uncommon error codes on failed logons to determine suspicious activity and tampering with accounts that have been disabled or somehow restricted. Depending on the network environment some failed logons Status can be added to the list.

• Effort: advanced

• Changelog:

  • 01/08/2023 - minor - Similarity strategy for the rule has changed and is now based on the user.target.name field.
  • 04/04/2024 - major - Rule's pattern field changed

Admin User RDP Remote Logon

Detects remote login through Remote Desktop Protocol (RDP) by Administrator user depending on internal pattern. Check before activation the identifiable administrators usernames (pattern or special unique character ("Admin*") to adapt and add some filtering.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Authentication Impossible Travel

Detects impossible travel when performing authentication from a source IP address, grouped by username.

• Effort: advanced

• Changelog:

  • 27/07/2024 - major - review filter to avoid false positive

Broadcom Edge Secure Web Gateway High Threat

Detects when a high threat is detected by Broadcom Edge Secure Web Gateway.

• Effort: master

Brute-Force On Fortinet Firewall Login

Spots many failed attempts to log on an administration interface.

• Effort: master

Denied Access To Remote Desktop

Detects when an authenticated user who is not allowed to log on remotely attempts to connect to this computer through Remote Desktop. This event can be generated by attackers when searching for available windows servers in the network. This rule detects only users from external network.

• Effort: intermediate

• Changelog:

  • 19/10/2023 - minor - Minor change in selection to reduce false positives.
  • 26/03/2024 - major - Rule's pattern field changed

Failed Logon Followed By A Success From Public IP Addresses

A login from a public IP can indicate a misconfigured firewall or network boundary. The detection look for 5 or more failed attemps followed by a successfull one. The sekoia.tags are used to filter internal Ipv4 addresses.

• Effort: master

• Changelog:

  • 29/05/2024 - major - Adding new field and switching to correlation rule.
  • 04/04/2024 - major - Rule's pattern field changed

Fortigate Firewall Successful External Login

Detects succesfull access to administration console of firewall from another IP address than 127.0.0.1. Prerequisites, check that the firewall logs format corresponds to the rule

• Effort: master

Google Cloud Audit Logs Account Suspended

Detects when Google Cloud Audit Logs notify a user account suspended for a suspicious activity

• Effort: intermediate

Google Cloud Audit Logs Application Added

Detects when an application is added to Google Workspace Domain. This should be an expected change made by an administrator and need to be checked.

• Effort: intermediate

Google Cloud Audit Logs Application Authorized

Detects when an application is authorized to access a Google user account. An exception is currently made for GMAIL because of the large number of hits.

• Effort: master

Google Cloud Audit Logs Attack Warning

Detects when Google Cloud Audit Logs notify an attack warning such as the famous "Government-backed attack".

• Effort: intermediate

Google Workspace Account Warning

Detects a suspicious login, leaked password, or account disabled following suspicious activity.

• Effort: elementary

Google Workspace Admin Creation

Detects when an admin is created or when his role is changed.

• Effort: master

• Changelog:

  • 22/05/2024 - minor - Adding new element to increase detection.

Google Workspace Suspicious Login

Detects a suspicious login reported by google.

• Effort: master

Login Brute-Force On Firewall

Detects successful access to administration console of a firewall after several failure.

• Effort: advanced

Login Brute-Force On FreeRadius

A user has attempted to login several times (brute-force) with error then one success.

• Effort: intermediate

Login Brute-Force On Sekoia.io

Detects successful access to Sekoia.io after several failure.

• Effort: intermediate

• Changelog:

  • 22/05/2024 - minor - Switch the group-by clause to a sekoiaio uuid field.

Microsoft 365 Device Code Authentication

Authentication via a device code is designed for use with input constrained devices. This method can however be abused, particularly in social engineering attacks. Whitelisting based on the organisation's practices is likely required to make this rule useful (e.g. excluding the public IP ranges of the organisation, excluding authentications attempt from managed devices, etc.). Note: if you collect Entra ID SignInLogs, the rule "Microsoft Entra ID (Azure AD) Device Code Authentication" is a better equivalent to this rule.

• Effort: master

Microsoft Entra ID (Azure AD) Device Code Authentication

Authentication via a device code is designed for use with input constrained devices. This method can however be abused, particularly in social engineering attacks. Whitelisting based on the organisation's practices is likely required to make this rule useful (e.g. excluding the public IP ranges of the organisation, excluding authentications attempt from managed devices, etc.)

• Effort: master

Netskope Admin Audit

Audit events for admin activites, from Logins to policies' changes.

• Effort: master

• Changelog:

  • 28/03/2024 - minor - Rule effort was updated to master

Okta Many Passwords Reset Attempt

This rule identifies a high number of Okta user password reset or account unlock attempts. An adversary may attempt to obtain unauthorized access to Okta user accounts using these methods and attempt to blend in with normal activity in their target's environment and evade detection.

• Effort: advanced

Okta Suspicious Activity Reported

Detects when a user reports suspicious activity for their Okta account. These events should be investigated, as they can help security teams identify when an adversary is attempting to gain access to their network.

• Effort: advanced

Okta Unauthorized Access to App

An user tries to access an unauthorized application.

• Effort: master

User Added to Local Administrators

Detects when user accounts are added which could be legitimate activity or a sign of privilege escalation activity, Potential False-Positives Legitimate administrative activity WinRM clients

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.
  • 04/04/2024 - major - Rule's pattern field changed

Account Manipulation

AWS CloudTrail IAM Failed User Creation

Detects an attemp to create a user account where the result is an explicit denied.

• Effort: intermediate

AWS CloudTrail IAM Password Policy Updated

Detects an update to the password policy. This could be an attempt to lower accounts security level.

• Effort: intermediate

AWS CloudTrail IAM Policy Changed

Detects change on AWS IAM Policy

• Effort: master

AWS CloudTrail Root ConsoleLogin

Detects a login with a root account on AWS portal. It is a best practice to avoid root account usage for daily tasks and to create an IAM admin user.

• Effort: intermediate

AWS CloudTrail Route 53 Domain Transfer Attempt

Detects when a request in success or failure is made to transfer a domain name to an other AWS account

• Effort: intermediate

AWS CloudTrail Route 53 Domain Transfer Lock Disabled

Detects when the transfer lock feature is disabled on a domain name handled by AWS Route 53 service.

• Effort: elementary

Active Directory Delegate To KRBTGT Service

Detects potential persistence installation from an already compromised administrator domain account. The attacker will create a TGT and abuse a service account with the constrained delegation and update it with the krbtgt service. The detection relies on the Event ID 4738.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Active Directory Replication User Backdoor

Backdooring domain object to grant the rights associated with DCSync to regular user or machine account, this technics is often used to give ResetPassword or WriteMembers or DCSync permission(s) for persistency on a domain.

• Effort: intermediate

• Changelog:

  • 15/10/2024 - major - Update pattern to avoid false positives and change rule effort
  • 26/03/2024 - major - Rule's pattern field changed

Active Directory User Backdoors

Detects scenarios where the attacker controls another user or computer account without having to use their credentials.

• Effort: intermediate

• Changelog:

  • 06/04/2023 - minor - Removed a selection as it triggered too many false positives, and the detection was not part of the main goal of this rule.
  • 26/03/2024 - major - Rule's pattern field changed

Add User to Privileged Group

Add user in a potential privileged group which can be used to elevate privileges on the system.

• Effort: advanced

Enabling Restricted Admin Mode

Detects when the restricted admin mode is enabled.

• Effort: elementary

Google Workspace Admin Modification

Detects when an admin is modified.

• Effort: master

Google Workspace Domain Delegation

Detects when a domain delegation is granted.

• Effort: master

Microsoft Entra ID (Azure AD) Self Service Password Reset In Failure

Detects self-service password reset in failure for various reasons (except licence or policy ones)

• Effort: master

Mimikatz Basic Commands

Detects Mimikatz most popular commands.

• Effort: elementary

• Changelog:

  • 06/04/2023 - minor - Added a filter to the rule as many false positives were observed.

Okta Admin Privilege Granted

Administrator privilege granted to an user or account. This can be privilege escalation, persistance over system or account takedown.

• Effort: advanced

Okta Application deleted

An application has been delete on Okta SSO.

• Effort: advanced

Okta Application modified

An application has been updated on Okta SSO.

• Effort: advanced

Okta User Account Deactivated

A user account has been deactivated in Okta.

• Effort: master

Okta User Impersonation Access

A user has initiated a session impersonation granting them access to the environment with the permissions of the user they are impersonating. This would likely indicate Okta administrative access and should only ever occur if requested and expected.

• Effort: advanced

Password Change On Directory Service Restore Mode (DSRM) Account

The Directory Service Restore Mode (DSRM) account is a local administrator account on Domain Controllers. Attackers may change the password to gain persistence.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Privileged AD Builtin Group Modified

Detects changes to privileged AD builtin groups in Active Directory that could indicate malicious or unexpected administrative activity. This detection rule detects changes on specific groups that are Administrators (S-1-5--500), Domain Admins (S-1-5--512), Enterprise Admins (S-1-5--519), Schema Admins (S-1-5--518), Account Operators (S-1-5-32-548) and Backup Operators (S-1-5-32-551).

• Effort: master

• Changelog:

  • 10/07/2023 - minor - Added AD groups and change to effort master.
  • 26/03/2024 - major - Rule's pattern field changed

SSH Authorized Key Alteration

The file authorized_keys is used by SSH server to identify SSH keys that are authorized to connect to the host, alteration of one of those files might indicate a user compromision.

• Effort: advanced

SeEnableDelagationPrivilege Granted To User Or Machine In Active Directory

Detects the SeEnableDelegationPrivilege right in Active Directory granted to a user of a computer, it would allow control of other AD user objects

• Effort: elementary

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

User Added to Local Administrators

Detects when user accounts are added which could be legitimate activity or a sign of privilege escalation activity, Potential False-Positives Legitimate administrative activity WinRM clients

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.
  • 04/04/2024 - major - Rule's pattern field changed

Varonis Many Accounts Disabled

This rule identifies a high number of account disabled.

• Effort: master

Web Shell

Antivirus Web Shell Detection

Detects a highly relevant Antivirus alert that reports a web shell. This is based on Windows Defender logs (Event ID 1116 and 1117).

• Effort: elementary

Component Object Model Hijacking

Windows Registry Persistence COM Key Linking

Detects COM object hijacking via TreatAs subkey. Logging for Registry events is needed in the Sysmon configuration with this kind of rule <TargetObject name="testr12" condition="end with">\TreatAs\(Default)</TargetObject>.

• Effort: master

• Changelog:

  • 14/12/2023 - minor - Exclude common legitimate processes

Authentication Package

Shell PID Injection

Detects when shells PID are listed and injected in another process. It can be performed to reuse sudo token related to shell in order to elevate privilege and maintain persistence.

• Effort: intermediate

External Remote Services

Anomaly New PowerShell Remote Session

Detects when PowerShell remote sessions are created in a short amount of time.

• Effort: master

• Changelog:

  • 11/06/2024 - minor - Adding fields to be displayed in the alert.

Datadome Protection Intrusion Detection

Detects when Datadome protection raises an alert linked to intrusion. Datadome is used against fraud and bots.

• Effort: master

Failed Logon Followed By A Success From Public IP Addresses

A login from a public IP can indicate a misconfigured firewall or network boundary. The detection look for 5 or more failed attemps followed by a successfull one. The sekoia.tags are used to filter internal Ipv4 addresses.

• Effort: master

• Changelog:

  • 29/05/2024 - major - Adding new field and switching to correlation rule.
  • 04/04/2024 - major - Rule's pattern field changed

SecurityScorecard Vulnerability Assessment Scanner New Issues

Raises an alert when SecurityScorecard Vulnerability Assessment Scanner find new issues.

• Effort: master

Trend Micro Apex One Intrusion Detection Alert

Trend Micro Apex One has raised an alert for an intrusion detection.

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Trend Micro Cloud One High Intrusion

Detects when Trend Micro EDR raised an alert for an intrusion with a high severity level.

• Effort: master

Trend Micro Cloud One Low Intrusion

Detects when Trend Micro EDR raised an alert for an intrusion with a low severity level.

• Effort: master

Trend Micro Cloud One Medium Intrusion

Detects when Trend Micro EDR raised an alert for an intrusion with a medium severity level.

• Effort: master

Create Account

AWS Persistence By Creating KeyPair And SecurityGroup

Attackers can use AWS credentials to create a KeyPair and a SecurityGroup to have continuous access to the AWS account.

• Effort: master

CVE-2021-20021 SonicWall Unauthenticated Administrator Access

Detects the exploitation of SonicWall Unauthenticated Admin Access.

• Effort: advanced

Google Workspace User Creation

Detects when a new user is created.

• Effort: master

Impacket Addcomputer

Detects suspicious computer account creation based on impacket default pattern

• Effort: intermediate

• Changelog:

  • 05/08/2024 - major - improve selection to extend detection

Net.exe User Account Creation

Identifies creation of local users via the net.exe command

• Effort: master

Okta User Account Created

A user account has been created in Okta.

• Effort: master

Suspicious URL Requested By Curl Or Wget Commands

Correlation rule aiming to be multi-source to detect URL with suspicious files extensions (seen on a network level by proxies or firewalls) being requested by curl or wget processes (seen on a host level).

• Effort: advanced

• Changelog:

  • 23/09/2024 - major - Fixed an issue with the detection pattern.

Suspicious Windows ANONYMOUS LOGON Local Account Created

Detects the creation of suspicious accounts simliar to ANONYMOUS LOGON, such as using additional spaces. Created as a covering detection for attackers trying to created an ANONYMOUS LOGON account as it is an account named used in internal Windows events and frequently filtered by attackers.

• Effort: elementary

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

User Account Created

Detects user creation on windows servers, which shouldn't happen in an Active Directory environment. Apply this on your windows server logs and not on your DC logs. One default account defaultuser0 is excluded as only used during Windows set-up. This detection use Security Event ID 4720.

• Effort: master

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed
  • 10/07/2024 - minor - Adding filter and new elements to reduce false positives.
  • 12/07/2024 - minor - Changing similarity strategy.

Office Application Startup

IcedID Execution Using Excel

Detects Excel spawning a process (rundll32 or wmic) running suspicious command-line. This behaviour could correspond to IcedID activity.

• Effort: elementary

Microsoft Office Startup Add-In

Detects add-ins that load when Microsoft Word or Excel starts (.wll/.xll are simply .dll fit for Word or Excel). The rule requires File Creation logging to work, which can be done using Sysmon Event ID 11.

• Effort: elementary

Office Application Startup Office Test

Detects the addition of office test registry that allows a user to specify an arbitrary DLL that will be executed everytime an Office application is started. An adversaries may abuse the Microsoft Office "Office Test" Registry key to obtain persistence on a compromised system.

• Effort: elementary

Browser Extensions

Malicious Browser Extensions

Detects browser extensions being loaded with the --load-extension and -base-url options, which works on Chromium-based browsers. We are looking for potentially malicious browser extensions. These extensions can get access to informations.

• Effort: advanced

BITS Jobs

BITSAdmin Download

Detects command to download file using BITSAdmin, a built-in tool in Windows. This technique is used by several threat actors to download scripts or payloads on infected system.

• Effort: advanced

• Changelog:

  • 06/12/2023 - minor - Adding key words to increase detection.

Traffic Signaling

Binary List Tcp

A binary is trying to list TCP connections. The prerequisites are to enable monitoring of the open and openat syscalls using Auditbeat.

• Effort: advanced

Server Software Component

Antivirus Web Shell Detection

Detects a highly relevant Antivirus alert that reports a web shell. This is based on Windows Defender logs (Event ID 1116 and 1117).

• Effort: elementary

CVE-2021-34473 ProxyShell Attempt

Detects CVE-2021-34473 ProxyShell attempt against Microsoft Exchange Server, Remote Code Execution Vulnerability.

• Effort: advanced

Default User www data User Compromised

User www_data by default cannot log and use a shell, any syscall of type execve induce user compromise

• Effort: master

Exchange Server Spawning Suspicious Processes

Look for Microsoft Exchange Server’s Unified Messaging service spawning suspicious sub-processes, suggesting exploitation of CVE-2021-26857 vulnerability.

• Effort: intermediate

Microsoft Exchange Server Creating Unusual Files

Look for Microsoft Exchange Server’s Unified Messaging service creating non-standard content on disk, which could indicate web shells or other malicious content, suggesting exploitation of CVE-2021-26858 vulnerability

• Effort: intermediate

Microsoft IIS Module Installation

Detects the installation of a new IIS module from the command line. It can used used to backdoor an IIS/OWA/Sharepoint server.

• Effort: advanced

• Changelog:

  • 10/10/2024 - major - Adding new commands with powershell and changing effort level.

PowerCat Function Loading

Detect a basic execution of PowerCat. PowerCat is a PowerShell function allowing to do basic connections, file transfer, shells, relays, generate payloads.

• Effort: intermediate

ProxyShell Microsoft Exchange Suspicious Paths

Detects suspicious calls to Microsoft Exchange resources, in locations related to webshells observed in campaigns using this vulnerability.

• Effort: elementary

Webshell Creation

Detects possible webshell file creation. It requires File Creation monitoring, which can be done using Sysmon's Event ID 11. However the recommended SwiftOnSecurity configuration does not fully cover the needs for this rule, it needs to be updated with the proper file names extensions.

• Effort: master

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Create or Modify System Process

APT29 Fake Google Update Service Install

This method detects malicious services mentioned in APT29 report by FireEye. The legitimate path for the Google update service is C:\Program Files (x86)\Google\Update\GoogleUpdate.exe so the service names and executable locations used by APT29 are specific enough to be detected in log files.

• Effort: elementary

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Chafer (APT 39) Activity

Detects previous Chafer (APT 39) activity attributed to OilRig as reported in Nyotron report in March 2018.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Cobalt Strike Default Service Creation Usage

Detects Cobalt Strike usage from an existing beacon when attacker tries to elevate or move laterally through a service creation.

• Effort: elementary

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Csrss Child Found

The csrss.exe process (csrss stands for Client / Server Runtime Subsystem) is a generic Windows process used to manage windows and Windows graphics. This process should not create a child process or it is very rare.

• Effort: intermediate

• Changelog:

  • 16/12/2024 - minor - Improve pattern mandatory fields and add filter to reduce false positives

Csrss Wrong Parent

The csrss.exe process (csrss stands for Client / Server Runtime Subsystem) is a generic Windows process used to manage windows and Windows graphics. This rule analyse if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Dllhost Wrong Parent

Dllhost.exe is a process belonging to Microsoft Windows Operating System. The dllhost.exe file manages DLL based applications. This rule analyse if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Some filters on parent process names were also added to reduce false positives.

Gpscript Suspicious Parent

Gpscript defines GPO scripts for users and applies them to login / logout sessions. This rule checks if the parent of this process is the supposed one (svchost) or not.

• Effort: intermediate

• Changelog:

  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives

Logonui Wrong Parent

Logonui.exe is a file associated with the Logon user interface. The login user interface is an essential part of the Windows operating system. It doesn't only make it easy for the user to log in to the PC but also determines whether the user has logged in and logged out correctly and makes it easy to switch between users. This rule checks if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 07/06/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake

Lsass Wrong Parent

Lsass ensures the identification of users (domain users or local users). Domain users are identified based on information in the Active Directory. Local users are identified based on information from the Security Account Manager (SAM) local database. This rule checks if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - The rule has been reworked for a specific intake to allow our customers to activate the rule for this intake which was not the case before.

Malicious Service Installations

Generic and known malicious service installation that appear in cases of lateral movement, credential dumping and other suspicious activity. It detects the use of PAExec, Wannacry commonly used malicious service, APT29 known malicious service name and net user service file name which is known as a sign of persistence.

• Effort: elementary

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Mshta Command From A Scheduled Task

Detects when an attacker leverage the Microsoft Windows Scheduled task feature to run the mshta.exe process. This is a common usage of a living-off-the-land binary, frequently abused for malicous purposes and not common nowadays in IT administration.

• Effort: intermediate

New Service Creation

Detects creation of a new service from command line

• Effort: advanced

OneNote Suspicious Children Process

In January 2023, a peak of attacks using .one files was observed in the wild. This rule tries to detect the effect of such attempts using this technique.

• Effort: advanced

• Changelog:

  • 15/04/2024 - minor - Changing effort level and adding new filters to reduce false positives.

Rare Logonui Child Found

Logonui.exe is a file associated with the Logon user interface. The login user interface is an essential part of the Windows operating system. It not only makes it easy for the user to log in to the PC but also determines whether the user has logged in and logged out correctly and makes it easy to switch between users. This process could create a child process but it is very rare and could be a signal of some process injection.

• Effort: advanced

Rare Lsass Child Found

Lsass ensures the identification of users (domain users or local users). Domain users are identified based on information in the Active Directory. Local users are identified based on information from the Security Account Manager (SAM) local database. This process should not create a child process or it is very rare.

• Effort: intermediate

Searchindexer Wrong Parent

Detects if the Search Indexer was executed by a non-legitimate parent process. Search Indexer is the Windows service that handles indexing of your files for Windows Search.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Searchprotocolhost Child Found

SearchProtocolHost.exe is part of the Windows Indexing Service, an application that indexes files from the local drive making them easier to search. This is a crucial part of the Windows operating system. This process should not create a child process or it is very rare.

• Effort: intermediate

Searchprotocolhost Wrong Parent

Detects if the Search Protocol Host process was executed by a non-legitimate parent process. Search Protocol Host is part of the Windows Indexing Service, a service indexing files on the local drive making them easier to search.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 12/03/2024 - minor - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake

Smss Wrong Parent

Detects if the Smss process was executed by a non-legitimate parent process. Session Manager Subsystem (smss) process is a component of the Microsoft Windows NT family of operating systems.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 05/04/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake

SolarWinds Wrong Child Process

Detects SolarWinds process starting an unusual child process. Process solarwinds.businesslayerhost.exe and solarwinds.businesslayerhostx64.exe created an unexepected child process which doesn't correspond to the legitimate ones.

• Effort: intermediate

• Changelog:

  • 14/06/2023 - major - Reworking of the rule after many FPs and a more suitable Elastic rule
  • 22/12/2023 - minor - Adding a child process name to the filter list to avoid some FPs

Spoolsv Wrong Parent

Detects if the Spoolsv process was executed by a non-legitimate parent process. Printer Spooler Service (Spoolsv) process is responsible for managing spooled print/fax jobs.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Added some new filters as well to reduce false positives.

StoneDrill Service Install

This method detects a service install of the malicious Microsoft Network Realtime Inspection Service service described in StoneDrill report by Kaspersky

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Suspicious Commands From MS SQL Server Shell

Detection of some shell commmands run from a cmd executed by Microsoft MS SQL Server. It could be a sign of xp_cmdshell allowed on the MS-SQL server.

• Effort: intermediate

Svchost Wrong Parent

Detects if the svchost.exe process was executed by a non-legitimate parent process. Svchost (Service Host Process) is a generic host process name for services that run from dynamic-link libraries (DLLs).

• Effort: master

• Changelog:

  • 04/07/2023 - minor - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 31/01/2024 - minor - Adding filters to reduce false positives
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. A filter has also been added to reduce false positives.

Taskhost Wrong Parent

Detects if the Taskhost process was executed by a non-legitimate parent process. Taskhost is the process of the Windows Task Manager which lists the processes that are currently running on the computer system.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Taskhost or Taskhostw Suspicious Child Found

Task Host manages pop-up windows when users try to close them in a Windows environment. Taskhost.exe triggers the host process for the task. Task Host is a Windows process designed to alert users when dialog boxes close. It is usually launched when restarting and shutting down a PC, and checks if all programs have been properly closed. This process should not create a child process or it is very rare.

• Effort: master

• Changelog:

  • 13/08/2024 - minor - Adding elements to filter to reduce false positives and changing effort level.

Taskhostw Wrong Parent

Detects if the Taskhostw process was executed by a non-legitimate parent process. Taskhostw is a software component of Windows service start manager, it starts DLL-based Windows services when the computer boots up.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Filters were also added to reduce false positives.

WMI Persistence Command Line Event Consumer

Detects WMI command line event consumers.

• Effort: elementary

Wininit Wrong Parent

Windows Boot is a background application launcher for the Windows operating system. Wininit.exe is responsible for performing the Windows initialization process. This rule analyse if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. A filter was also added to reduce false positives.

Winlogon wrong parent

Winlogon.exe is a process that performs the Windows login management function, handling user login and logout in Windows. You see this process in action whenever the operating system asks you for your username and password. It is also responsible for loading user profiles after login, this supports automated login (when relevant) and keyboard and mouse inactivity monitoring to decide when to invoke the screen saver. This rule analyse if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Filter was also added to reduce false positives.

Winrshost Wrong Parent

Detects if the Winrshosts process was executed by a non-legitimate parent process The winrshost.exe is a Host Process for WinRM's Remote Shell plugin.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Filters were also added to reduce false positives.

Wsmprovhost Wrong Parent

Detects if the Wsmprovhost process was executed by a non-legitimate parent process. The PowerShell host wsmprovhost.exe is a proxy process executed remotely through PowerShell when using Windows Remote Management (WinRM).

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 25/10/2023 - minor - Adding filter to reduce false positives.
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Event Triggered Execution

COM Hijack Via Sdclt

Detects changes to 'HKCU\Software\Classes\Folder\shell\open\command\DelegateExecute', to bypass UAC using 'sdclt.exe'.

• Effort: intermediate

Change Default File Association

When a file is opened, the default program used to open the file (also called the file association or handler) is checked. File association selections are stored in the Windows Registry and can be edited by users, administrators, or programs that have Registry access or by administrators using the built-in assoc utility. Applications can modify the file association for a given file extension to call an arbitrary program when a file with the given extension is opened.

• Effort: advanced

Component Object Model Hijacking

Detects component object model hijacking. An attacker can establish persistence with COM objects.

• Effort: advanced

Control Panel Items

Detects the malicious use of a control panel item

• Effort: advanced

HTML Smuggling Suspicious Usage

Based on several samples from different botnets, this rule aims at detecting HTML infection chain by looking for HTML created files followed by suspicious files being executed.

• Effort: intermediate

New DLL Added To AppCertDlls Registry Key

Dynamic-link libraries (DLLs) that are specified in the AppCertDLLs value in the Registry key can be abused to obtain persistence and privilege escalation by causing a malicious DLL to be loaded and run in the context of separate processes on the computer. Logging for Registry events is needed in the Sysmon configuration (events 12 and 13).

• Effort: intermediate

Reconnaissance Commands Activities

Based on Cynet, Microsoft and Kaspersky analysis of Qakbot, this rule tries to detect some discovery TTPs.

• Effort: intermediate

Registry Persistence Using 'Image File Execution' And 'SilentProcessExit' Keys

Detects persistence registry keys. Logging for Registry events is needed, it can be done in the Sysmon configuration (events 12 and 13).

• Effort: master

Sticky Key Like Backdoor Usage

Detects the usage and installation of a backdoor that uses an option to register a malicious debugger for built-in tools that are accessible in the login screen. Prerequisites are logging for Registry events, which can be done with Sysmon (events 12 and 13).

• Effort: elementary

• Changelog:

  • 21/06/2024 - major - Update detection pattern for ECS fields/value compliance

Suspicious Netsh DLL Persistence

Detects persitence via netsh helper. Netsh interacts with other operating system components using dynamic-link library (DLL) files. Adversaries may establish persistence by executing malicious content triggered by Netsh Helper DLLs.

• Effort: elementary

Suspicious Scripting In A WMI Consumer

Detects suspicious scripting in WMI Event Consumers. The rule requires to log WMI Consumers, which can be done through Sysmon's Event IDs 20 and 21.

• Effort: intermediate

WMI Event Subscription

Detects creation of WMI event subscription persistence method

• Effort: advanced

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

WMI Persistence Script Event Consumer File Write

Detects file writes through WMI script event consumer.

• Effort: advanced

Boot or Logon Autostart Execution

Autorun Keys Modification

Detects modification of autostart extensibility point (ASEP) in registry. Prerequisites are Logging for Registry events in the Sysmon configuration (events 12 and 13).

• Effort: master

DLL Load via LSASS Registry Key

Detects a method to load DLL via LSASS process using an undocumented Registry key. Prerequisites are logging for Registry events. This can be done with Sysmon events 12, 13 and 14 and monitor SYSTEM\CurrentControlSet\Services.

• Effort: intermediate

Kernel Module Alteration

Kernel module installation can be used to configure system settings to automatically execute a program during system boot or logon to maintain persistence or gain higher-level privileges on compromised systems. The prerequisites are to enable monitoring of the finit_module, init_module, delete_module syscalls using Auditbeat.

• Effort: advanced

Leviathan Registry Key Activity

Detects registry key used by Leviathan APT in Malaysian focused campaign.

• Effort: elementary

• Changelog:

  • 21/06/2024 - major - Update detection pattern for ECS fields/value compliance

Malware Persistence Registry Key

Detects registry key used by several malware, especially Formbook spyware in two ways, either the Sysmon registry events, or the commands line.

• Effort: master

• Changelog:

  • 21/06/2024 - major - Update detection pattern for ECS fields/value compliance, and filter some FPs

Microsoft Office Macro Security Registry Modifications

Detects registry changes allowing an attacker to make Microsoft Office products runs Macros without warning. Events are collected either from ETW/Sysmon/EDR depending of the integration.

• Effort: master

Narrator Feedback-Hub Persistence

The Windows 10 Narrator's Feedback-Hub registry key has been modified which could be done by an attacker for persistence purposes. Prerequisites are logging for Registry events in the Sysmon configuration (events 12 and 13). Careful since the SwiftOnSecurity Sysmon's configuration needs to be changed to log for this specifically.

• Effort: master

NjRat Registry Changes

Detects changes for the RUN registry key which happen when a victim is infected by NjRAT. Please note that even if NjRat is well-known for the behavior the rule catches, the rule is a bit larger and could catch other malwares.

• Effort: master

• Changelog:

  • 29/11/2023 - minor - Update regex pattern to insensitive case
  • 07/06/2024 - major - Update pattern to reduce false positives

Njrat Registry Values

Detects specifis registry values that are related to njRat usage.

• Effort: intermediate

Powershell Winlogon Helper DLL

Detects modifications to the Winlogon Registry keys, which may cause Winlogon to load and execute malicious DLLs and/or executables.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

RUN Registry Key Created From Suspicious Folder

Detects the suspicious RUN keys created by software located in Download or temporary Outlook/Internet Explorer directories. Prerequisites are logging for Registry events, which can be done with Sysmon (events 12 and 13).

• Effort: advanced

Registry Key Used By Some Old Agent Tesla Samples

Detects potential use of the RUN registry key to execute some Agent Tesla samples at boot. Prerequisites are to log for Registry events in the Sysmon configuration (events 12 and 13).

• Effort: intermediate

Security Support Provider (SSP) Added to LSA Configuration

Detects the addition of a SSP to the registry. This is commonly used for persistence. Upon a reboot or API call, SSP DLLs gain access to encrypted and plaintext passwords stored in Windows. Logging for Registry events is needed for this rule to work (this can be done through Sysmon EventIDs 12 and 13).

• Effort: elementary

• Changelog:

  • 21/06/2024 - major - Update detection pattern for ECS fields/value compliance

Suspicious desktop.ini Action

Detects unusual processes accessing desktop.ini, which can be leveraged to alter how Explorer displays a folder's content (i.e. renaming files) without changing them on disk.

• Effort: advanced

• Changelog:

  • 30/04/2024 - major - Adding some filters

Svchost Modification

Detects the modification of svchost in the registry.

• Effort: advanced

Modify Authentication Process

1Password EPM MFA Disable

Detects when the MFA for 1Password is disabled.

• Effort: master

Active Directory Shadow Credentials

Detects alternative credentials material adding. Attackers can abuse msDS-KeyCredentialLink and create a key pair to obtain a persistent and stealthy access to the target user or computer.

• Effort: elementary

Google Workspace MFA changed

Detects when the settings for the MFA are modified.

• Effort: master

Google Workspace Password Change

Detects when a password is changed. An attacker can perform this action to impact the availability of the account.

• Effort: master

• Changelog:

  • 20/06/2024 - minor - Adding new element to increase detection.

KeePass Config XML In Command-Line

Detects a command-line interaction with the KeePass Config XML file. It could be used to retrieve informations or to be abused for persistence.

• Effort: intermediate

Microsoft Entra ID (Azure AD) MFA Method Change

This rule detects when an user makes a change to the multifactor authentication methods for their account. In environments where this rule is too noisy, alert filters should be applied, e.g. to focus on privileged accounts, or unusual source network locations.

• Effort: master

Hijack Execution Flow

DHCP Callout DLL Installation

Detects the installation of a Callout DLL via CalloutDlls and CalloutEnabled parameter in Registry, which can be used to execute code in context of the DHCP server (restart required).

• Effort: intermediate

DHCP Server Error Failed Loading the CallOut DLL

This rule detects a DHCP server error in which a specified Callout DLL (in registry) could not be loaded.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

DHCP Server Loaded the CallOut DLL

This rule detects a DHCP server in which a specified Callout DLL (in registry) was loaded. This would indicate a succesful attack against DHCP service allowing to disrupt the service or alter the integrity of the responses.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

DNS Server Error Failed Loading The ServerLevelPluginDLL

This rule detects a DNS server error in which a specified plugin DLL (in registry) could not be loaded. This requires the dedicated Windows event provider Microsoft-Windows-DNS-Server-Service.

• Effort: master

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

DNS ServerLevelPluginDll Installation

Detects the installation of a plugin DLL via ServerLevelPluginDll parameter in Windows Registry or in command line, which can be used to execute code in context of the DNS server (restart required). To fully use this rule, prerequesites are logging for Registry events in the Sysmon configuration (events 12, 13 and 14).

• Effort: master

Dynamic Linker Hijacking From Environment Variable

LD_PRELOAD and LD_LIBRARY_PATH are environment variables used by the Operating System at the runtime to load shared objects (library.ies) when executing a new process, attacker can overwrite this variable to attempts a privileges escalation.

• Effort: master

• Changelog:

  • 11/07/2024 - minor - Added filter to reduce false positvives

Elevated Shell Launched By Browser

Detects when openwith.exe is launched with privileges followed by a browser launching an elevated shell. Related to the CVE-2024-38014.

• Effort: master

Exploiting SetupComplete.cmd CVE-2019-1378

Detects exploitation attempts of privilege escalation vulnerability via SetupComplete.cmd and PartnerSetupComplete.cmd described in CVE-2019-1378.

• Effort: intermediate

Hijack Legit RDP Session To Move Laterally

Identifies suspicious file creations in the startup folder of a remote system. An adversary could abuse this to move laterally by dropping a malicious script or executable that will be executed after a reboot or user logon.

• Effort: intermediate

Linux Shared Lib Injection Via Ldso Preload

Detect ld.so.preload modification for shared lib injection, technique used by attackers to load arbitrary code into process

• Effort: intermediate

Suspicious DLL side loading from ProgramData

Detects suspicious DLL side-loading from C:\ProgramData where the DLL is not signed.

• Effort: intermediate

Svchost DLL Search Order Hijack

Detects svchost process hijacking through DLL loading. IKEEXT and SessionEnv service, as they call LoadLibrary on files that do not exist within C:\Windows\System32\ by default. An attacker can place their malicious logic within the PROCESS_ATTACH block of their library and restart the aforementioned services "svchost.exe -k netsvcs" to gain code execution on a remote machine.

• Effort: master

Werfault DLL Injection

Werfault DLL search order look first in the current file, which lets an attacker use th legitimate exe to run its own DLL.

• Effort: intermediate

Windows Registry Persistence COM Search Order Hijacking

Detects potential COM object hijacking leveraging the COM Search Order. Logging for Registry events is needed, it can be done with Sysmon's Event IDs 12 and 13.

• Effort: advanced

• Changelog:

  • 11/01/2024 - minor - Adding filtering for some FPs

Privilege Execution

Boot or Logon Initialization Scripts

Logon Scripts (UserInitMprLogonScript)

Detects creation or execution of UserInitMprLogonScript persistence method. The rule requires to log for process command lines and registry creations or update, which can be done using Sysmon Event IDs 1, 12, 13 and 14.

• Effort: advanced

Scheduled Task/Job

BazarLoader Persistence Using Schtasks

Detects possible BazarLoader persistence using schtasks. BazarLoader will create a Scheduled Task using a specific command line to establish its persistence.

• Effort: intermediate

Blue Mockingbird Malware

Attempts to detect system changes made by Blue Mockingbird

• Effort: elementary

Chafer (APT 39) Activity

Detects previous Chafer (APT 39) activity attributed to OilRig as reported in Nyotron report in March 2018.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Creation or Modification of a GPO Scheduled Task

Detects lateral movement using GPO scheduled task, often used to deploy ransomware at scale. This rule is based on the EventID 5145 which is specific to Windows Servers. The advanced audit policy setting Object Access > Audit Detailed File Share must be configured for Success/Failure.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Cron Files Alteration

Cron Files and Cron Directory alteration used by attacker for persistency or privilege escalation. To ensure full performance on this rule, auditbeat intake must be configure with the module file_integrity containing path mentionned in the pattern.

• Effort: advanced

Google Workspace App Script Scheduled Task

Detects when a scheduled task is launched by Google App Script. This product is used to create scripts and integrate applications within Google Workspace.

• Effort: advanced

Qakbot Persistence Using Schtasks

Detects possible Qakbot persistence using schtasks.

• Effort: intermediate

Remote Task Creation Via ATSVC Named Pipe

Detects remote task creation via at.exe or API interacting with ATSVC Named Pipe. This requires Windows Security event logging with the File Share policy.

• Effort: intermediate

• Changelog:

  • 21/03/2024 - minor - change filter to ACL hex value

STRRAT Scheduled Task

Detect STRRAT when it achieves persistence by creating a scheduled task. STRRAT is a Java-based stealer and remote backdoor, it establishes persistence using this specific command line: 'cmd /c schtasks /create /sc minute /mo 30 /tn Skype /tr "C:\Users\Admin\AppData\Roaming\SAMPLENAME.jar"'

• Effort: intermediate

Schtasks Persistence With High Privileges

Detection of scheduled task with high privileges used by attacker for persistence.

• Effort: elementary

Schtasks Suspicious Parent

Detects schtasks started from suspicious and/or unusual processes.

• Effort: intermediate

Spyware Persistence Using Schtasks

Detects possible Agent Tesla or Formbook persistence using schtasks. The name of the scheduled task used by these malware is very specific (Updates/randomstring).

• Effort: intermediate

Suspicious Scheduled Task Creation

Detects suspicious scheduled task creation, either executed by a non-system user or a user who is not administrator (the user ID is not S-1-5-18 or S-1-5-18-*). This detection rule doesn't match Sysmon EventID 1 because the user SID is always set to S-1-5-18.

• Effort: intermediate

Windows Suspicious Scheduled Task Creation

The rule identify creation of new scheduled task who run suspicious or dangerous command

• Effort: intermediate

Process Injection

Address Space Layout Randomization (ASLR) Alteration

ASLR is a security feature used by the Operating System to mitigate memory exploit, attacker might want to disable it

• Effort: intermediate

Cobalt Strike Named Pipes

Detects the pipes established by Cobalt Strike to allow a communication between its beacons.

• Effort: master

CreateRemoteThread Common Process Injection

Detects a possible process injection through CreateRemoteThread() which is spotted by EventID 8 from Sysmon and several EDRs. This rule has a list of process commonly being injected by the attackers that should be updated regularly.

• Effort: advanced

Daspren Parad Malicious Behavior

Detects when Daspren Parad kills a process with a malicious behavior.

• Effort: master

Dynwrapx Module Loading

Detects the loading of DynamicWrapperX (Dynwrapx). It is used by some malware in their infection chain and could help to detect its usage from vbs/wscript/cscript scripts. This is based on Microsoft Windows Sysmon events (Event ID 7).

• Effort: advanced

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Malicious Named Pipe

Detects the creation of a named pipe used by known malware. Prerequisites are logging for PipeEvents in Sysmon config (Event ID 17 and 18).

• Effort: intermediate

MavInject Process Injection

Detects process injection using the signed Windows tool Mavinject32.exe (which is a LOLBAS)

• Effort: intermediate

Mshta Command From A Scheduled Task

Detects when an attacker leverage the Microsoft Windows Scheduled task feature to run the mshta.exe process. This is a common usage of a living-off-the-land binary, frequently abused for malicous purposes and not common nowadays in IT administration.

• Effort: intermediate

Process Herpaderping

Detection of process herpaderping using Sysmon Event ID 25. It detects that an image has been locked for access. Several processes have been excluded to avoid FPs.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Process Hollowing Detection

Detection of process hollowing using Sysmon Event ID 25. It detects that an image has been replaced in a process memory.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Searchindexer Wrong Parent

Detects if the Search Indexer was executed by a non-legitimate parent process. Search Indexer is the Windows service that handles indexing of your files for Windows Search.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Searchprotocolhost Wrong Parent

Detects if the Search Protocol Host process was executed by a non-legitimate parent process. Search Protocol Host is part of the Windows Indexing Service, a service indexing files on the local drive making them easier to search.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 12/03/2024 - minor - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake

Smss Wrong Parent

Detects if the Smss process was executed by a non-legitimate parent process. Session Manager Subsystem (smss) process is a component of the Microsoft Windows NT family of operating systems.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 05/04/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake

Spoolsv Wrong Parent

Detects if the Spoolsv process was executed by a non-legitimate parent process. Printer Spooler Service (Spoolsv) process is responsible for managing spooled print/fax jobs.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Added some new filters as well to reduce false positives.

Suspicious Process Requiring DLL Starts Without DLL

Detects potential process injection and hollowing on processes that usually require a DLL to be launched, but are launched without any argument.

• Effort: intermediate

• Changelog:

  • 22/01/2024 - minor - Added filter to reduce false positives

Svchost Wrong Parent

Detects if the svchost.exe process was executed by a non-legitimate parent process. Svchost (Service Host Process) is a generic host process name for services that run from dynamic-link libraries (DLLs).

• Effort: master

• Changelog:

  • 04/07/2023 - minor - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 31/01/2024 - minor - Adding filters to reduce false positives
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. A filter has also been added to reduce false positives.

Taskhost Wrong Parent

Detects if the Taskhost process was executed by a non-legitimate parent process. Taskhost is the process of the Windows Task Manager which lists the processes that are currently running on the computer system.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Taskhostw Wrong Parent

Detects if the Taskhostw process was executed by a non-legitimate parent process. Taskhostw is a software component of Windows service start manager, it starts DLL-based Windows services when the computer boots up.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Filters were also added to reduce false positives.

Wsmprovhost Wrong Parent

Detects if the Wsmprovhost process was executed by a non-legitimate parent process. The PowerShell host wsmprovhost.exe is a proxy process executed remotely through PowerShell when using Windows Remote Management (WinRM).

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 25/10/2023 - minor - Adding filter to reduce false positives.
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Exploitation for Privilege Escalation

Audit CVE Event

Detects events generated by Windows to indicate the exploitation of a known vulnerability.

• Effort: elementary

• Changelog:

  • 15/07/2024 - major - review filter and improve similarity

CVE-2021-4034 Polkit's pkexec

Detection of Polkit's pkexec exploit

• Effort: intermediate

Certify Or Certipy

Detects the use of certify and certipy which are two different tools used to enumerate and abuse Active Directory Certificate Services.

• Effort: advanced

Exploiting SetupComplete.cmd CVE-2019-1378

Detects exploitation attempts of privilege escalation vulnerability via SetupComplete.cmd and PartnerSetupComplete.cmd described in CVE-2019-1378.

• Effort: intermediate

Okta Admin Privilege Granted

Administrator privilege granted to an user or account. This can be privilege escalation, persistance over system or account takedown.

• Effort: advanced

Suspicious New Printer Ports In Registry

Detects a suspicious printer port creation in Registry that could be an attempt to exploit CVE-2020-1048. The CVE-2020-1048 consists in gaining persistence, privilege by abusing a flaw in the Print Spooler service to execute a payload whose path is stored in the registry key. To fully use this rule, prerequesites are logging for Registry events in the Sysmon configuration (events 12, 13 and 14).

• Effort: master

Valid Accounts

Account Added To A Security Enabled Group

Detection in order to investigate who has added a specific Domain User in Domain Admins or Group Policy Creator Owners (Security event 4728)

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed
  • 12/07/2024 - minor - add similarity strategy

Account Removed From A Security Enabled Group

Detection in order to investigate who has removed a specific Domain User in Domain Admins or Group Policy Creator Owners (Security event 4729)

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed
  • 12/07/2024 - minor - Add similarity strategy

Account Tampering - Suspicious Failed Logon Reasons

This method uses uncommon error codes on failed logons to determine suspicious activity and tampering with accounts that have been disabled or somehow restricted. Depending on the network environment some failed logons Status can be added to the list.

• Effort: advanced

• Changelog:

  • 01/08/2023 - minor - Similarity strategy for the rule has changed and is now based on the user.target.name field.
  • 04/04/2024 - major - Rule's pattern field changed

Admin User RDP Remote Logon

Detects remote login through Remote Desktop Protocol (RDP) by Administrator user depending on internal pattern. Check before activation the identifiable administrators usernames (pattern or special unique character ("Admin*") to adapt and add some filtering.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Authentication Impossible Travel

Detects impossible travel when performing authentication from a source IP address, grouped by username.

• Effort: advanced

• Changelog:

  • 27/07/2024 - major - review filter to avoid false positive

Broadcom Edge Secure Web Gateway High Threat

Detects when a high threat is detected by Broadcom Edge Secure Web Gateway.

• Effort: master

Brute-Force On Fortinet Firewall Login

Spots many failed attempts to log on an administration interface.

• Effort: master

Denied Access To Remote Desktop

Detects when an authenticated user who is not allowed to log on remotely attempts to connect to this computer through Remote Desktop. This event can be generated by attackers when searching for available windows servers in the network. This rule detects only users from external network.

• Effort: intermediate

• Changelog:

  • 19/10/2023 - minor - Minor change in selection to reduce false positives.
  • 26/03/2024 - major - Rule's pattern field changed

Failed Logon Followed By A Success From Public IP Addresses

A login from a public IP can indicate a misconfigured firewall or network boundary. The detection look for 5 or more failed attemps followed by a successfull one. The sekoia.tags are used to filter internal Ipv4 addresses.

• Effort: master

• Changelog:

  • 29/05/2024 - major - Adding new field and switching to correlation rule.
  • 04/04/2024 - major - Rule's pattern field changed

Fortigate Firewall Successful External Login

Detects succesfull access to administration console of firewall from another IP address than 127.0.0.1. Prerequisites, check that the firewall logs format corresponds to the rule

• Effort: master

Google Cloud Audit Logs Account Suspended

Detects when Google Cloud Audit Logs notify a user account suspended for a suspicious activity

• Effort: intermediate

Google Cloud Audit Logs Application Added

Detects when an application is added to Google Workspace Domain. This should be an expected change made by an administrator and need to be checked.

• Effort: intermediate

Google Cloud Audit Logs Application Authorized

Detects when an application is authorized to access a Google user account. An exception is currently made for GMAIL because of the large number of hits.

• Effort: master

Google Cloud Audit Logs Attack Warning

Detects when Google Cloud Audit Logs notify an attack warning such as the famous "Government-backed attack".

• Effort: intermediate

Google Workspace Account Warning

Detects a suspicious login, leaked password, or account disabled following suspicious activity.

• Effort: elementary

Google Workspace Admin Creation

Detects when an admin is created or when his role is changed.

• Effort: master

• Changelog:

  • 22/05/2024 - minor - Adding new element to increase detection.

Google Workspace Suspicious Login

Detects a suspicious login reported by google.

• Effort: master

Login Brute-Force On Firewall

Detects successful access to administration console of a firewall after several failure.

• Effort: advanced

Login Brute-Force On FreeRadius

A user has attempted to login several times (brute-force) with error then one success.

• Effort: intermediate

Login Brute-Force On Sekoia.io

Detects successful access to Sekoia.io after several failure.

• Effort: intermediate

• Changelog:

  • 22/05/2024 - minor - Switch the group-by clause to a sekoiaio uuid field.

Microsoft 365 Device Code Authentication

Authentication via a device code is designed for use with input constrained devices. This method can however be abused, particularly in social engineering attacks. Whitelisting based on the organisation's practices is likely required to make this rule useful (e.g. excluding the public IP ranges of the organisation, excluding authentications attempt from managed devices, etc.). Note: if you collect Entra ID SignInLogs, the rule "Microsoft Entra ID (Azure AD) Device Code Authentication" is a better equivalent to this rule.

• Effort: master

Microsoft Entra ID (Azure AD) Device Code Authentication

Authentication via a device code is designed for use with input constrained devices. This method can however be abused, particularly in social engineering attacks. Whitelisting based on the organisation's practices is likely required to make this rule useful (e.g. excluding the public IP ranges of the organisation, excluding authentications attempt from managed devices, etc.)

• Effort: master

Netskope Admin Audit

Audit events for admin activites, from Logins to policies' changes.

• Effort: master

• Changelog:

  • 28/03/2024 - minor - Rule effort was updated to master

Okta Many Passwords Reset Attempt

This rule identifies a high number of Okta user password reset or account unlock attempts. An adversary may attempt to obtain unauthorized access to Okta user accounts using these methods and attempt to blend in with normal activity in their target's environment and evade detection.

• Effort: advanced

Okta Suspicious Activity Reported

Detects when a user reports suspicious activity for their Okta account. These events should be investigated, as they can help security teams identify when an adversary is attempting to gain access to their network.

• Effort: advanced

Okta Unauthorized Access to App

An user tries to access an unauthorized application.

• Effort: master

User Added to Local Administrators

Detects when user accounts are added which could be legitimate activity or a sign of privilege escalation activity, Potential False-Positives Legitimate administrative activity WinRM clients

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.
  • 04/04/2024 - major - Rule's pattern field changed

Account Manipulation

AWS CloudTrail IAM Failed User Creation

Detects an attemp to create a user account where the result is an explicit denied.

• Effort: intermediate

AWS CloudTrail IAM Password Policy Updated

Detects an update to the password policy. This could be an attempt to lower accounts security level.

• Effort: intermediate

AWS CloudTrail IAM Policy Changed

Detects change on AWS IAM Policy

• Effort: master

AWS CloudTrail Root ConsoleLogin

Detects a login with a root account on AWS portal. It is a best practice to avoid root account usage for daily tasks and to create an IAM admin user.

• Effort: intermediate

AWS CloudTrail Route 53 Domain Transfer Attempt

Detects when a request in success or failure is made to transfer a domain name to an other AWS account

• Effort: intermediate

AWS CloudTrail Route 53 Domain Transfer Lock Disabled

Detects when the transfer lock feature is disabled on a domain name handled by AWS Route 53 service.

• Effort: elementary

Active Directory Delegate To KRBTGT Service

Detects potential persistence installation from an already compromised administrator domain account. The attacker will create a TGT and abuse a service account with the constrained delegation and update it with the krbtgt service. The detection relies on the Event ID 4738.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Active Directory Replication User Backdoor

Backdooring domain object to grant the rights associated with DCSync to regular user or machine account, this technics is often used to give ResetPassword or WriteMembers or DCSync permission(s) for persistency on a domain.

• Effort: intermediate

• Changelog:

  • 15/10/2024 - major - Update pattern to avoid false positives and change rule effort
  • 26/03/2024 - major - Rule's pattern field changed

Active Directory User Backdoors

Detects scenarios where the attacker controls another user or computer account without having to use their credentials.

• Effort: intermediate

• Changelog:

  • 06/04/2023 - minor - Removed a selection as it triggered too many false positives, and the detection was not part of the main goal of this rule.
  • 26/03/2024 - major - Rule's pattern field changed

Add User to Privileged Group

Add user in a potential privileged group which can be used to elevate privileges on the system.

• Effort: advanced

Enabling Restricted Admin Mode

Detects when the restricted admin mode is enabled.

• Effort: elementary

Google Workspace Admin Modification

Detects when an admin is modified.

• Effort: master

Google Workspace Domain Delegation

Detects when a domain delegation is granted.

• Effort: master

Microsoft Entra ID (Azure AD) Self Service Password Reset In Failure

Detects self-service password reset in failure for various reasons (except licence or policy ones)

• Effort: master

Mimikatz Basic Commands

Detects Mimikatz most popular commands.

• Effort: elementary

• Changelog:

  • 06/04/2023 - minor - Added a filter to the rule as many false positives were observed.

Okta Admin Privilege Granted

Administrator privilege granted to an user or account. This can be privilege escalation, persistance over system or account takedown.

• Effort: advanced

Okta Application deleted

An application has been delete on Okta SSO.

• Effort: advanced

Okta Application modified

An application has been updated on Okta SSO.

• Effort: advanced

Okta User Account Deactivated

A user account has been deactivated in Okta.

• Effort: master

Okta User Impersonation Access

A user has initiated a session impersonation granting them access to the environment with the permissions of the user they are impersonating. This would likely indicate Okta administrative access and should only ever occur if requested and expected.

• Effort: advanced

Password Change On Directory Service Restore Mode (DSRM) Account

The Directory Service Restore Mode (DSRM) account is a local administrator account on Domain Controllers. Attackers may change the password to gain persistence.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Privileged AD Builtin Group Modified

Detects changes to privileged AD builtin groups in Active Directory that could indicate malicious or unexpected administrative activity. This detection rule detects changes on specific groups that are Administrators (S-1-5--500), Domain Admins (S-1-5--512), Enterprise Admins (S-1-5--519), Schema Admins (S-1-5--518), Account Operators (S-1-5-32-548) and Backup Operators (S-1-5-32-551).

• Effort: master

• Changelog:

  • 10/07/2023 - minor - Added AD groups and change to effort master.
  • 26/03/2024 - major - Rule's pattern field changed

SSH Authorized Key Alteration

The file authorized_keys is used by SSH server to identify SSH keys that are authorized to connect to the host, alteration of one of those files might indicate a user compromision.

• Effort: advanced

SeEnableDelagationPrivilege Granted To User Or Machine In Active Directory

Detects the SeEnableDelegationPrivilege right in Active Directory granted to a user of a computer, it would allow control of other AD user objects

• Effort: elementary

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

User Added to Local Administrators

Detects when user accounts are added which could be legitimate activity or a sign of privilege escalation activity, Potential False-Positives Legitimate administrative activity WinRM clients

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.
  • 04/04/2024 - major - Rule's pattern field changed

Varonis Many Accounts Disabled

This rule identifies a high number of account disabled.

• Effort: master

Web Shell

Antivirus Web Shell Detection

Detects a highly relevant Antivirus alert that reports a web shell. This is based on Windows Defender logs (Event ID 1116 and 1117).

• Effort: elementary

Access Token Manipulation

Jumpcloud Api Key Updated

An API Token has been updated on Jumplcoud portal.

• Effort: advanced

Meterpreter or Cobalt Strike Getsystem Service Installation

Detects the use of getsystem Meterpreter/Cobalt Strike command by detecting some of the techniques being used (technique 1,2 and 5).

• Effort: elementary

Okta API Token created

A new API Token has been created on Okta SSO.

• Effort: advanced

Okta API Token revoked

A new API Token has been deleted on Okta SSO.

• Effort: advanced

Possible RottenPotato Attack

Detects logon events that have characteristics of events generated during an attack leveraging RottenPotato.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Shell PID Injection

Detects when shells PID are listed and injected in another process. It can be performed to reuse sudo token related to shell in order to elevate privilege and maintain persistence.

• Effort: intermediate

Domain or Tenant Policy Modification

Creation or Modification of a GPO Scheduled Task

Detects lateral movement using GPO scheduled task, often used to deploy ransomware at scale. This rule is based on the EventID 5145 which is specific to Windows Servers. The advanced audit policy setting Object Access > Audit Detailed File Share must be configured for Success/Failure.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Domain Trust Created Or Removed

A trust was created or removed to a domain. An attacker could perform that in order to do lateral movement easily between domains or shutdown the ability of two domains to communicate.

• Effort: advanced

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

ESET Protect Set Policy

Detects when a new policy is set or removed.

• Effort: master

GPO Executable Delivery

Detects MSI binaries run through GPOs.

• Effort: intermediate

Jumpcloud Policy Modified

Detects when a Jumpcloud policy is modified.

• Effort: intermediate

Microsoft Entra ID (Azure AD) Domain Trust Modification

Adversaries may add new domain trusts or modify the properties of existing domain trusts to evade defenses and/or elevate privileges. Confirm the added or modified target domain/URL is legitimate administrator behavior.

• Effort: elementary

Okta Policy Modified or Deleted

Detects when an Okta policy is modified or deleted.

• Effort: advanced

Okta Policy Rule Modified or Deleted

Detects when an Okta Policy Rule is Modified or Deleted.

• Effort: advanced

Privileged AD Builtin Group Modified

Detects changes to privileged AD builtin groups in Active Directory that could indicate malicious or unexpected administrative activity. This detection rule detects changes on specific groups that are Administrators (S-1-5--500), Domain Admins (S-1-5--512), Enterprise Admins (S-1-5--519), Schema Admins (S-1-5--518), Account Operators (S-1-5-32-548) and Backup Operators (S-1-5-32-551).

• Effort: master

• Changelog:

  • 10/07/2023 - minor - Added AD groups and change to effort master.
  • 26/03/2024 - major - Rule's pattern field changed

Tenable Identity Exposure / Alsid Critical Severity Alert

Tenable Identity Exposure / Alsid raised a critical severity alert.

• Effort: master

Tenable Identity Exposure / Alsid High Severity Alert

Tenable Identity Exposure / Alsid raised an alert.

• Effort: master

Create or Modify System Process

APT29 Fake Google Update Service Install

This method detects malicious services mentioned in APT29 report by FireEye. The legitimate path for the Google update service is C:\Program Files (x86)\Google\Update\GoogleUpdate.exe so the service names and executable locations used by APT29 are specific enough to be detected in log files.

• Effort: elementary

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Chafer (APT 39) Activity

Detects previous Chafer (APT 39) activity attributed to OilRig as reported in Nyotron report in March 2018.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Cobalt Strike Default Service Creation Usage

Detects Cobalt Strike usage from an existing beacon when attacker tries to elevate or move laterally through a service creation.

• Effort: elementary

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Csrss Child Found

The csrss.exe process (csrss stands for Client / Server Runtime Subsystem) is a generic Windows process used to manage windows and Windows graphics. This process should not create a child process or it is very rare.

• Effort: intermediate

• Changelog:

  • 16/12/2024 - minor - Improve pattern mandatory fields and add filter to reduce false positives

Csrss Wrong Parent

The csrss.exe process (csrss stands for Client / Server Runtime Subsystem) is a generic Windows process used to manage windows and Windows graphics. This rule analyse if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Dllhost Wrong Parent

Dllhost.exe is a process belonging to Microsoft Windows Operating System. The dllhost.exe file manages DLL based applications. This rule analyse if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Some filters on parent process names were also added to reduce false positives.

Gpscript Suspicious Parent

Gpscript defines GPO scripts for users and applies them to login / logout sessions. This rule checks if the parent of this process is the supposed one (svchost) or not.

• Effort: intermediate

• Changelog:

  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives

Logonui Wrong Parent

Logonui.exe is a file associated with the Logon user interface. The login user interface is an essential part of the Windows operating system. It doesn't only make it easy for the user to log in to the PC but also determines whether the user has logged in and logged out correctly and makes it easy to switch between users. This rule checks if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 07/06/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake

Lsass Wrong Parent

Lsass ensures the identification of users (domain users or local users). Domain users are identified based on information in the Active Directory. Local users are identified based on information from the Security Account Manager (SAM) local database. This rule checks if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - The rule has been reworked for a specific intake to allow our customers to activate the rule for this intake which was not the case before.

Malicious Service Installations

Generic and known malicious service installation that appear in cases of lateral movement, credential dumping and other suspicious activity. It detects the use of PAExec, Wannacry commonly used malicious service, APT29 known malicious service name and net user service file name which is known as a sign of persistence.

• Effort: elementary

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Mshta Command From A Scheduled Task

Detects when an attacker leverage the Microsoft Windows Scheduled task feature to run the mshta.exe process. This is a common usage of a living-off-the-land binary, frequently abused for malicous purposes and not common nowadays in IT administration.

• Effort: intermediate

New Service Creation

Detects creation of a new service from command line

• Effort: advanced

OneNote Suspicious Children Process

In January 2023, a peak of attacks using .one files was observed in the wild. This rule tries to detect the effect of such attempts using this technique.

• Effort: advanced

• Changelog:

  • 15/04/2024 - minor - Changing effort level and adding new filters to reduce false positives.

Rare Logonui Child Found

Logonui.exe is a file associated with the Logon user interface. The login user interface is an essential part of the Windows operating system. It not only makes it easy for the user to log in to the PC but also determines whether the user has logged in and logged out correctly and makes it easy to switch between users. This process could create a child process but it is very rare and could be a signal of some process injection.

• Effort: advanced

Rare Lsass Child Found

Lsass ensures the identification of users (domain users or local users). Domain users are identified based on information in the Active Directory. Local users are identified based on information from the Security Account Manager (SAM) local database. This process should not create a child process or it is very rare.

• Effort: intermediate

Searchindexer Wrong Parent

Detects if the Search Indexer was executed by a non-legitimate parent process. Search Indexer is the Windows service that handles indexing of your files for Windows Search.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Searchprotocolhost Child Found

SearchProtocolHost.exe is part of the Windows Indexing Service, an application that indexes files from the local drive making them easier to search. This is a crucial part of the Windows operating system. This process should not create a child process or it is very rare.

• Effort: intermediate

Searchprotocolhost Wrong Parent

Detects if the Search Protocol Host process was executed by a non-legitimate parent process. Search Protocol Host is part of the Windows Indexing Service, a service indexing files on the local drive making them easier to search.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 12/03/2024 - minor - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake

Smss Wrong Parent

Detects if the Smss process was executed by a non-legitimate parent process. Session Manager Subsystem (smss) process is a component of the Microsoft Windows NT family of operating systems.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 05/04/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake

SolarWinds Wrong Child Process

Detects SolarWinds process starting an unusual child process. Process solarwinds.businesslayerhost.exe and solarwinds.businesslayerhostx64.exe created an unexepected child process which doesn't correspond to the legitimate ones.

• Effort: intermediate

• Changelog:

  • 14/06/2023 - major - Reworking of the rule after many FPs and a more suitable Elastic rule
  • 22/12/2023 - minor - Adding a child process name to the filter list to avoid some FPs

Spoolsv Wrong Parent

Detects if the Spoolsv process was executed by a non-legitimate parent process. Printer Spooler Service (Spoolsv) process is responsible for managing spooled print/fax jobs.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Added some new filters as well to reduce false positives.

StoneDrill Service Install

This method detects a service install of the malicious Microsoft Network Realtime Inspection Service service described in StoneDrill report by Kaspersky

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Suspicious Commands From MS SQL Server Shell

Detection of some shell commmands run from a cmd executed by Microsoft MS SQL Server. It could be a sign of xp_cmdshell allowed on the MS-SQL server.

• Effort: intermediate

Svchost Wrong Parent

Detects if the svchost.exe process was executed by a non-legitimate parent process. Svchost (Service Host Process) is a generic host process name for services that run from dynamic-link libraries (DLLs).

• Effort: master

• Changelog:

  • 04/07/2023 - minor - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 31/01/2024 - minor - Adding filters to reduce false positives
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. A filter has also been added to reduce false positives.

Taskhost Wrong Parent

Detects if the Taskhost process was executed by a non-legitimate parent process. Taskhost is the process of the Windows Task Manager which lists the processes that are currently running on the computer system.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Taskhost or Taskhostw Suspicious Child Found

Task Host manages pop-up windows when users try to close them in a Windows environment. Taskhost.exe triggers the host process for the task. Task Host is a Windows process designed to alert users when dialog boxes close. It is usually launched when restarting and shutting down a PC, and checks if all programs have been properly closed. This process should not create a child process or it is very rare.

• Effort: master

• Changelog:

  • 13/08/2024 - minor - Adding elements to filter to reduce false positives and changing effort level.

Taskhostw Wrong Parent

Detects if the Taskhostw process was executed by a non-legitimate parent process. Taskhostw is a software component of Windows service start manager, it starts DLL-based Windows services when the computer boots up.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Filters were also added to reduce false positives.

WMI Persistence Command Line Event Consumer

Detects WMI command line event consumers.

• Effort: elementary

Wininit Wrong Parent

Windows Boot is a background application launcher for the Windows operating system. Wininit.exe is responsible for performing the Windows initialization process. This rule analyse if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. A filter was also added to reduce false positives.

Winlogon wrong parent

Winlogon.exe is a process that performs the Windows login management function, handling user login and logout in Windows. You see this process in action whenever the operating system asks you for your username and password. It is also responsible for loading user profiles after login, this supports automated login (when relevant) and keyboard and mouse inactivity monitoring to decide when to invoke the screen saver. This rule analyse if the parent of this process is a legitimate one or not.

• Effort: master

• Changelog:

  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Filter was also added to reduce false positives.

Winrshost Wrong Parent

Detects if the Winrshosts process was executed by a non-legitimate parent process The winrshost.exe is a Host Process for WinRM's Remote Shell plugin.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Filters were also added to reduce false positives.

Wsmprovhost Wrong Parent

Detects if the Wsmprovhost process was executed by a non-legitimate parent process. The PowerShell host wsmprovhost.exe is a proxy process executed remotely through PowerShell when using Windows Remote Management (WinRM).

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 25/10/2023 - minor - Adding filter to reduce false positives.
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Event Triggered Execution

COM Hijack Via Sdclt

Detects changes to 'HKCU\Software\Classes\Folder\shell\open\command\DelegateExecute', to bypass UAC using 'sdclt.exe'.

• Effort: intermediate

Change Default File Association

When a file is opened, the default program used to open the file (also called the file association or handler) is checked. File association selections are stored in the Windows Registry and can be edited by users, administrators, or programs that have Registry access or by administrators using the built-in assoc utility. Applications can modify the file association for a given file extension to call an arbitrary program when a file with the given extension is opened.

• Effort: advanced

Component Object Model Hijacking

Detects component object model hijacking. An attacker can establish persistence with COM objects.

• Effort: advanced

Control Panel Items

Detects the malicious use of a control panel item

• Effort: advanced

HTML Smuggling Suspicious Usage

Based on several samples from different botnets, this rule aims at detecting HTML infection chain by looking for HTML created files followed by suspicious files being executed.

• Effort: intermediate

New DLL Added To AppCertDlls Registry Key

Dynamic-link libraries (DLLs) that are specified in the AppCertDLLs value in the Registry key can be abused to obtain persistence and privilege escalation by causing a malicious DLL to be loaded and run in the context of separate processes on the computer. Logging for Registry events is needed in the Sysmon configuration (events 12 and 13).

• Effort: intermediate

Reconnaissance Commands Activities

Based on Cynet, Microsoft and Kaspersky analysis of Qakbot, this rule tries to detect some discovery TTPs.

• Effort: intermediate

Registry Persistence Using 'Image File Execution' And 'SilentProcessExit' Keys

Detects persistence registry keys. Logging for Registry events is needed, it can be done in the Sysmon configuration (events 12 and 13).

• Effort: master

Sticky Key Like Backdoor Usage

Detects the usage and installation of a backdoor that uses an option to register a malicious debugger for built-in tools that are accessible in the login screen. Prerequisites are logging for Registry events, which can be done with Sysmon (events 12 and 13).

• Effort: elementary

• Changelog:

  • 21/06/2024 - major - Update detection pattern for ECS fields/value compliance

Suspicious Netsh DLL Persistence

Detects persitence via netsh helper. Netsh interacts with other operating system components using dynamic-link library (DLL) files. Adversaries may establish persistence by executing malicious content triggered by Netsh Helper DLLs.

• Effort: elementary

Suspicious Scripting In A WMI Consumer

Detects suspicious scripting in WMI Event Consumers. The rule requires to log WMI Consumers, which can be done through Sysmon's Event IDs 20 and 21.

• Effort: intermediate

WMI Event Subscription

Detects creation of WMI event subscription persistence method

• Effort: advanced

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

WMI Persistence Script Event Consumer File Write

Detects file writes through WMI script event consumer.

• Effort: advanced

Boot or Logon Autostart Execution

Autorun Keys Modification

Detects modification of autostart extensibility point (ASEP) in registry. Prerequisites are Logging for Registry events in the Sysmon configuration (events 12 and 13).

• Effort: master

DLL Load via LSASS Registry Key

Detects a method to load DLL via LSASS process using an undocumented Registry key. Prerequisites are logging for Registry events. This can be done with Sysmon events 12, 13 and 14 and monitor SYSTEM\CurrentControlSet\Services.

• Effort: intermediate

Kernel Module Alteration

Kernel module installation can be used to configure system settings to automatically execute a program during system boot or logon to maintain persistence or gain higher-level privileges on compromised systems. The prerequisites are to enable monitoring of the finit_module, init_module, delete_module syscalls using Auditbeat.

• Effort: advanced

Leviathan Registry Key Activity

Detects registry key used by Leviathan APT in Malaysian focused campaign.

• Effort: elementary

• Changelog:

  • 21/06/2024 - major - Update detection pattern for ECS fields/value compliance

Malware Persistence Registry Key

Detects registry key used by several malware, especially Formbook spyware in two ways, either the Sysmon registry events, or the commands line.

• Effort: master

• Changelog:

  • 21/06/2024 - major - Update detection pattern for ECS fields/value compliance, and filter some FPs

Microsoft Office Macro Security Registry Modifications

Detects registry changes allowing an attacker to make Microsoft Office products runs Macros without warning. Events are collected either from ETW/Sysmon/EDR depending of the integration.

• Effort: master

Narrator Feedback-Hub Persistence

The Windows 10 Narrator's Feedback-Hub registry key has been modified which could be done by an attacker for persistence purposes. Prerequisites are logging for Registry events in the Sysmon configuration (events 12 and 13). Careful since the SwiftOnSecurity Sysmon's configuration needs to be changed to log for this specifically.

• Effort: master

NjRat Registry Changes

Detects changes for the RUN registry key which happen when a victim is infected by NjRAT. Please note that even if NjRat is well-known for the behavior the rule catches, the rule is a bit larger and could catch other malwares.

• Effort: master

• Changelog:

  • 29/11/2023 - minor - Update regex pattern to insensitive case
  • 07/06/2024 - major - Update pattern to reduce false positives

Njrat Registry Values

Detects specifis registry values that are related to njRat usage.

• Effort: intermediate

Powershell Winlogon Helper DLL

Detects modifications to the Winlogon Registry keys, which may cause Winlogon to load and execute malicious DLLs and/or executables.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

RUN Registry Key Created From Suspicious Folder

Detects the suspicious RUN keys created by software located in Download or temporary Outlook/Internet Explorer directories. Prerequisites are logging for Registry events, which can be done with Sysmon (events 12 and 13).

• Effort: advanced

Registry Key Used By Some Old Agent Tesla Samples

Detects potential use of the RUN registry key to execute some Agent Tesla samples at boot. Prerequisites are to log for Registry events in the Sysmon configuration (events 12 and 13).

• Effort: intermediate

Security Support Provider (SSP) Added to LSA Configuration

Detects the addition of a SSP to the registry. This is commonly used for persistence. Upon a reboot or API call, SSP DLLs gain access to encrypted and plaintext passwords stored in Windows. Logging for Registry events is needed for this rule to work (this can be done through Sysmon EventIDs 12 and 13).

• Effort: elementary

• Changelog:

  • 21/06/2024 - major - Update detection pattern for ECS fields/value compliance

Suspicious desktop.ini Action

Detects unusual processes accessing desktop.ini, which can be leveraged to alter how Explorer displays a folder's content (i.e. renaming files) without changing them on disk.

• Effort: advanced

• Changelog:

  • 30/04/2024 - major - Adding some filters

Svchost Modification

Detects the modification of svchost in the registry.

• Effort: advanced

Abuse Elevation Control Mechanism

CMSTP UAC Bypass via COM Object Access

Detects UAC Bypass Attempt Using Microsoft Connection Manager Profile Installer Autoelevate-capable COM Objects

• Effort: intermediate

• Changelog:

  • 28/05/2024 - minor - Add pattern to filter to improve coverage

COM Hijack Via Sdclt

Detects changes to 'HKCU\Software\Classes\Folder\shell\open\command\DelegateExecute', to bypass UAC using 'sdclt.exe'.

• Effort: intermediate

Citrix NetScaler (ADC) Actions Blocked

This rule aims to detect a large amount of actions blocked performed from the same source.

• Effort: advanced

Google Workspace Bypass 2FA

Detects when user tries to bypass the 2FA.

• Effort: master

HTML Smuggling Suspicious Usage

Based on several samples from different botnets, this rule aims at detecting HTML infection chain by looking for HTML created files followed by suspicious files being executed.

• Effort: intermediate

Linux Capabilities Discovery

Linux capabilities are special attributes in the Linux kernel that grant processes and binary executables specific privileges that are normally reserved for processes whose effective user ID is 0 (The root user, and only the root user, has UID 0). This rule aims to detect discovery of such capabilities on the Linux system. The prerequisites are to enable monitoring of the execve and getxattr syscalls using Auditbeat.

• Effort: intermediate

Okta User Impersonation Access

A user has initiated a session impersonation granting them access to the environment with the permissions of the user they are impersonating. This would likely indicate Okta administrative access and should only ever occur if requested and expected.

• Effort: advanced

Reconnaissance Commands Activities

Based on Cynet, Microsoft and Kaspersky analysis of Qakbot, this rule tries to detect some discovery TTPs.

• Effort: intermediate

Setuid Or Setgid Usage

Detects the usage of a setuid or a setgid. The prerequisites are to enable monitoring of the setuid and setgid syscalls using Auditbeat.

• Effort: intermediate

Shell PID Injection

Detects when shells PID are listed and injected in another process. It can be performed to reuse sudo token related to shell in order to elevate privilege and maintain persistence.

• Effort: intermediate

UAC Bypass Using Fodhelper

Detects UAC bypass method using Fodhelper after setting the proper registry key, used in particular by Agent Tesla (RAT) or more recently by Earth Luscas. Prerequisites are logging for Registry events in the Sysmon configuration (events 12 and 13).

• Effort: intermediate

• Changelog:

  • 21/06/2024 - major - Update detection pattern for ECS fields/value compliance

UAC Bypass Via Sdclt

Detects changes to HKCU\Software\Classes\exefile\shell\runas\command\isolatedCommand by an attacker in order to bypass User Account Control (UAC)

• Effort: elementary

UAC Bypass via Event Viewer

Detects UAC bypass method using Windows event viewer.

• Effort: intermediate

• Changelog:

  • 21/11/2023 - minor - Improve filter to reduce false positives and clarified the rule pattern.
  • 21/09/2023 - minor - Improve filter to reduce false positives

Unusual Process Executed in Temporary Directory

Identifies processes running in a temporary folder. This is sometimes done by adversaries to hide malware. The prerequisites are to enable monitoring of the execve syscall using Auditbeat.

• Effort: master

Hijack Execution Flow

DHCP Callout DLL Installation

Detects the installation of a Callout DLL via CalloutDlls and CalloutEnabled parameter in Registry, which can be used to execute code in context of the DHCP server (restart required).

• Effort: intermediate

DHCP Server Error Failed Loading the CallOut DLL

This rule detects a DHCP server error in which a specified Callout DLL (in registry) could not be loaded.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

DHCP Server Loaded the CallOut DLL

This rule detects a DHCP server in which a specified Callout DLL (in registry) was loaded. This would indicate a succesful attack against DHCP service allowing to disrupt the service or alter the integrity of the responses.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

DNS Server Error Failed Loading The ServerLevelPluginDLL

This rule detects a DNS server error in which a specified plugin DLL (in registry) could not be loaded. This requires the dedicated Windows event provider Microsoft-Windows-DNS-Server-Service.

• Effort: master

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

DNS ServerLevelPluginDll Installation

Detects the installation of a plugin DLL via ServerLevelPluginDll parameter in Windows Registry or in command line, which can be used to execute code in context of the DNS server (restart required). To fully use this rule, prerequesites are logging for Registry events in the Sysmon configuration (events 12, 13 and 14).

• Effort: master

Dynamic Linker Hijacking From Environment Variable

LD_PRELOAD and LD_LIBRARY_PATH are environment variables used by the Operating System at the runtime to load shared objects (library.ies) when executing a new process, attacker can overwrite this variable to attempts a privileges escalation.

• Effort: master

• Changelog:

  • 11/07/2024 - minor - Added filter to reduce false positvives

Elevated Shell Launched By Browser

Detects when openwith.exe is launched with privileges followed by a browser launching an elevated shell. Related to the CVE-2024-38014.

• Effort: master

Exploiting SetupComplete.cmd CVE-2019-1378

Detects exploitation attempts of privilege escalation vulnerability via SetupComplete.cmd and PartnerSetupComplete.cmd described in CVE-2019-1378.

• Effort: intermediate

Hijack Legit RDP Session To Move Laterally

Identifies suspicious file creations in the startup folder of a remote system. An adversary could abuse this to move laterally by dropping a malicious script or executable that will be executed after a reboot or user logon.

• Effort: intermediate

Linux Shared Lib Injection Via Ldso Preload

Detect ld.so.preload modification for shared lib injection, technique used by attackers to load arbitrary code into process

• Effort: intermediate

Suspicious DLL side loading from ProgramData

Detects suspicious DLL side-loading from C:\ProgramData where the DLL is not signed.

• Effort: intermediate

Svchost DLL Search Order Hijack

Detects svchost process hijacking through DLL loading. IKEEXT and SessionEnv service, as they call LoadLibrary on files that do not exist within C:\Windows\System32\ by default. An attacker can place their malicious logic within the PROCESS_ATTACH block of their library and restart the aforementioned services "svchost.exe -k netsvcs" to gain code execution on a remote machine.

• Effort: master

Werfault DLL Injection

Werfault DLL search order look first in the current file, which lets an attacker use th legitimate exe to run its own DLL.

• Effort: intermediate

Windows Registry Persistence COM Search Order Hijacking

Detects potential COM object hijacking leveraging the COM Search Order. Logging for Registry events is needed, it can be done with Sysmon's Event IDs 12 and 13.

• Effort: advanced

• Changelog:

  • 11/01/2024 - minor - Adding filtering for some FPs

Escape to Host

Docker Escape Bind Mount

Catch Docker escape via mount escape followed by chroot

• Effort: intermediate

Defense Evasion

Obfuscated Files or Information

OneNote Embedded File

Detects creation or uses of OneNote embedded files with unusual extensions.

• Effort: intermediate

• Changelog:

  • 20/02/2023 - minor - Adding the .chm and .wsf file extensions for a file opened from a OneNote.
  • 09/02/2023 - minor - Adding other suspicious file extensions (.cmd, .img, .iso, .msi, .vhd, .vhdx) for file opened from a OneNote.

PowerShell EncodedCommand

Detects popular file extensions in commands obfuscated in base64 run through the EncodedCommand option.

• Effort: advanced

PowerShell Invoke-Obfuscation Obfuscated IEX Invocation

Detects all variations of obfuscated powershell IEX invocation code generated by Invoke-Obfuscation framework

• Effort: advanced

Secure Deletion With SDelete

Detects renaming of file while deletion with SDelete tool. SDelete is a tool that permits to securely delete files by overwriting them (no recovery possible). Few threat actors are using it to delete traces of their malware.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Suspicious XOR Encoded PowerShell Command Line

Detects suspicious powershell process which includes bxor command, alternative obfuscation method to b64 encoded commands.

• Effort: advanced

Masquerading

AutoIt3 Execution From Suspicious Folder

Detects AutoIt3 execution from an unusual/suspicious folder. Legitimate folders are "Program Files" and "AppData\Local". AutoIt3.exe is a legitimate process used to execute AutoIt program files, which are used by legitimate software, custom scripts, but also malware. Finding AutoIt3 execution from unusual/suspicious folder can help detect malware activities, such as DarkGate execution. The detection rule can be tailored to your environment and your use of AutoIt3 by filtering out folder's execution of legitimate applications or scripts.

• Effort: advanced

Copy Of Legitimate System32 Executable

A script has copied a System32 executable.

• Effort: intermediate

Execution From Suspicious Folder

Detects a suspicious execution from an uncommon folder

• Effort: master

Exploit For CVE-2017-0261 Or CVE-2017-0262

Detects Winword starting uncommon sub process FLTLDR.exe as used in exploits for CVE-2017-0261 and CVE-2017-0262 through command line or PowerShell script. This is a very basic detection method relying on the rare usage of EPS files from Winword.

• Effort: advanced

Formbook Hijacked Process Command

Detects process hijacked by Formbook malware which executes specific commands to delete the dropper or copy browser credentials to the database before sending them to the C2.

• Effort: intermediate

Legitimate Process Execution From Unusual Folder

Detects the execution of a legitimate, windows built-in process name from an unusual / suspicious folder. Legitimate folders are c:\windows\system32\, \SystemRoot\system32\, c:\windows\syswow64\ and c:\windows\winsxs. Many malwares/attackers use legitimate names to masquerade but if they are not Administrator yet, they often can't write file into these legitimate folders.

• Effort: advanced

• Changelog:

  • 22/01/2024 - minor - Extending filter to avoid FPs
  • 04/01/2024 - major - Rework filter selection with contains instead of re modifier
  • 26/03/2024 - major - Rule's pattern field changed

Linux Binary Masquerading

Attackers could rename legitimate system bin to evade security mechanisme. The prerequisites are to enable monitoring of the execve syscall using Auditbeat.

• Effort: elementary

• Changelog:

  • 12/12/2023 - minor - extend regex to macth more cases

New Or Renamed User Account With '$' In Attribute 'SamAccountName'

Detects possible bypass EDR and SIEM via abnormal user account name.

• Effort: intermediate

Non-Legitimate Executable Using AcceptEula Parameter

Detects accepteula in command line with non-legitimate executable name. Some attackers are masquerading SysInternals tools with decoy names to prevent detection.

• Effort: advanced

• Changelog:

  • 19/02/2024 - minor - Update filter and effort level according to the observed hits for the rule.

Phorpiex Process Masquerading

Detects specific process executable path used by the Phorpiex botnet to masquerade its system process network activity. It looks for a pattern of a system process executable name that is not legitimate and running from a folder that is created via a random algorithm 13-15 numbers long.

• Effort: elementary

Possible Malicious File Double Extension

Detects request to potential malicious file with double extension

• Effort: elementary

RTLO Character

Detects RTLO (Right-To-Left character) in file and process names.

• Effort: elementary

Suspicious Cmd File Copy Command To Network Share

Copy suspicious files through Windows cmd prompt to network share

• Effort: intermediate

Suspicious Cmd.exe Command Line

Detection on suspicious cmd.exe command line seen being used by some attackers (e.g. Lazarus with Word macros). This requires Windows process command line logging.

• Effort: master

• Changelog:

  • 30/05/2023 - minor - Adding the Intellij IDEA to filter list
  • 22/11/2024 - major - Adding new elements for detection and filters.
  • 27/11/2024 - minor - Adding new filters to reduce false positives.

Unsigned Driver Loaded From Suspicious Location

Detects when a driver is unsigned and loaded from a suspicious directory.

• Effort: advanced

Process Injection

Address Space Layout Randomization (ASLR) Alteration

ASLR is a security feature used by the Operating System to mitigate memory exploit, attacker might want to disable it

• Effort: intermediate

Cobalt Strike Named Pipes

Detects the pipes established by Cobalt Strike to allow a communication between its beacons.

• Effort: master

CreateRemoteThread Common Process Injection

Detects a possible process injection through CreateRemoteThread() which is spotted by EventID 8 from Sysmon and several EDRs. This rule has a list of process commonly being injected by the attackers that should be updated regularly.

• Effort: advanced

Daspren Parad Malicious Behavior

Detects when Daspren Parad kills a process with a malicious behavior.

• Effort: master

Dynwrapx Module Loading

Detects the loading of DynamicWrapperX (Dynwrapx). It is used by some malware in their infection chain and could help to detect its usage from vbs/wscript/cscript scripts. This is based on Microsoft Windows Sysmon events (Event ID 7).

• Effort: advanced

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Malicious Named Pipe

Detects the creation of a named pipe used by known malware. Prerequisites are logging for PipeEvents in Sysmon config (Event ID 17 and 18).

• Effort: intermediate

MavInject Process Injection

Detects process injection using the signed Windows tool Mavinject32.exe (which is a LOLBAS)

• Effort: intermediate

Mshta Command From A Scheduled Task

Detects when an attacker leverage the Microsoft Windows Scheduled task feature to run the mshta.exe process. This is a common usage of a living-off-the-land binary, frequently abused for malicous purposes and not common nowadays in IT administration.

• Effort: intermediate

Process Herpaderping

Detection of process herpaderping using Sysmon Event ID 25. It detects that an image has been locked for access. Several processes have been excluded to avoid FPs.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Process Hollowing Detection

Detection of process hollowing using Sysmon Event ID 25. It detects that an image has been replaced in a process memory.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Searchindexer Wrong Parent

Detects if the Search Indexer was executed by a non-legitimate parent process. Search Indexer is the Windows service that handles indexing of your files for Windows Search.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Searchprotocolhost Wrong Parent

Detects if the Search Protocol Host process was executed by a non-legitimate parent process. Search Protocol Host is part of the Windows Indexing Service, a service indexing files on the local drive making them easier to search.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 12/03/2024 - minor - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake

Smss Wrong Parent

Detects if the Smss process was executed by a non-legitimate parent process. Session Manager Subsystem (smss) process is a component of the Microsoft Windows NT family of operating systems.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 05/04/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake

Spoolsv Wrong Parent

Detects if the Spoolsv process was executed by a non-legitimate parent process. Printer Spooler Service (Spoolsv) process is responsible for managing spooled print/fax jobs.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Added some new filters as well to reduce false positives.

Suspicious Process Requiring DLL Starts Without DLL

Detects potential process injection and hollowing on processes that usually require a DLL to be launched, but are launched without any argument.

• Effort: intermediate

• Changelog:

  • 22/01/2024 - minor - Added filter to reduce false positives

Svchost Wrong Parent

Detects if the svchost.exe process was executed by a non-legitimate parent process. Svchost (Service Host Process) is a generic host process name for services that run from dynamic-link libraries (DLLs).

• Effort: master

• Changelog:

  • 04/07/2023 - minor - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 31/01/2024 - minor - Adding filters to reduce false positives
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. A filter has also been added to reduce false positives.

Taskhost Wrong Parent

Detects if the Taskhost process was executed by a non-legitimate parent process. Taskhost is the process of the Windows Task Manager which lists the processes that are currently running on the computer system.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Taskhostw Wrong Parent

Detects if the Taskhostw process was executed by a non-legitimate parent process. Taskhostw is a software component of Windows service start manager, it starts DLL-based Windows services when the computer boots up.

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake. Filters were also added to reduce false positives.

Wsmprovhost Wrong Parent

Detects if the Wsmprovhost process was executed by a non-legitimate parent process. The PowerShell host wsmprovhost.exe is a proxy process executed remotely through PowerShell when using Windows Remote Management (WinRM).

• Effort: master

• Changelog:

  • 20/11/2023 - minor - Rule's effort level has been changed to advanced as it was too dependent on the environment.
  • 04/07/2023 - major - Added filter to reduce false positives
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation
  • 25/10/2023 - minor - Adding filter to reduce false positives.
  • 19/03/2024 - major - Added filter to reduce false positives
  • 17/10/2024 - major - Removed a filter on a specific intake, the rule now works fine for every intake.

Scripting

Suspicious VBS Execution Parameter

Detects suspicious VBS file execution with a specific parameter by cscript. It was observed in the Operation CloudHopper.

• Effort: elementary

Indicator Removal

AWS CloudTrail KMS CMK Key Deleted

Detects when a CMK is deleted or scheduled for deletion

• Effort: advanced

Clear EventLogs Through CommandLine

Detects a command that clears event logs which could indicate an attempt from an attacker to erase its previous traces.

• Effort: intermediate

Compression Followed By Suppression

Detects when a file is compressed and deleted.

• Effort: advanced

Cookies Deletion

Detects when cookies are deleted by a suspicious process.

• Effort: master

ETW Tampering

Detects a command that clears or disables any ETW Trace log which could indicate a logging evasion

• Effort: intermediate

• Changelog:

  • 08/11/2023 - minor - Added filter to reduce false positives

Erase Shell History

Malware and attacker try to reduce their fingerprints on compromised host by deleting shell history.

• Effort: advanced

Eventlog Cleared

Some threat groups tend to delete local EventLogs (Security being the most common one to be deleted) using certain utilities. The EventID 517 is old and 1102 should be used for this instead on newer Windows versions.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

High Privileges Network Share Removal

Detects high privileges shares being deleted with the net share command.

• Effort: intermediate

• Changelog:

  • 02/02/2024 - major - changing current pattern and adding another one

Microsoft Defender Antivirus History Deleted

Windows Defender history has been deleted. Could be an attempt by an attacker to remove its traces.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Microsoft Defender Antivirus History Directory Deleted

Windows Defender history directory has been deleted. This could be an attempt by an attacker to remove its traces.

• Effort: elementary

Microsoft Defender Antivirus Tampering Detected

Detection of Windows Defender Tampering, from definitions' deletion to deactivation of parts or all of Defender.

• Effort: advanced

• Changelog:

  • 07/08/2023 - minor - Rule effort changed from intermediate to advanced considering the number of false positives observed.
  • 26/03/2024 - major - Rule's pattern field changed

Secure Deletion With SDelete

Detects renaming of file while deletion with SDelete tool. SDelete is a tool that permits to securely delete files by overwriting them (no recovery possible). Few threat actors are using it to delete traces of their malware.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Valid Accounts

Account Added To A Security Enabled Group

Detection in order to investigate who has added a specific Domain User in Domain Admins or Group Policy Creator Owners (Security event 4728)

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed
  • 12/07/2024 - minor - add similarity strategy

Account Removed From A Security Enabled Group

Detection in order to investigate who has removed a specific Domain User in Domain Admins or Group Policy Creator Owners (Security event 4729)

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed
  • 12/07/2024 - minor - Add similarity strategy

Account Tampering - Suspicious Failed Logon Reasons

This method uses uncommon error codes on failed logons to determine suspicious activity and tampering with accounts that have been disabled or somehow restricted. Depending on the network environment some failed logons Status can be added to the list.

• Effort: advanced

• Changelog:

  • 01/08/2023 - minor - Similarity strategy for the rule has changed and is now based on the user.target.name field.
  • 04/04/2024 - major - Rule's pattern field changed

Admin User RDP Remote Logon

Detects remote login through Remote Desktop Protocol (RDP) by Administrator user depending on internal pattern. Check before activation the identifiable administrators usernames (pattern or special unique character ("Admin*") to adapt and add some filtering.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Authentication Impossible Travel

Detects impossible travel when performing authentication from a source IP address, grouped by username.

• Effort: advanced

• Changelog:

  • 27/07/2024 - major - review filter to avoid false positive

Broadcom Edge Secure Web Gateway High Threat

Detects when a high threat is detected by Broadcom Edge Secure Web Gateway.

• Effort: master

Brute-Force On Fortinet Firewall Login

Spots many failed attempts to log on an administration interface.

• Effort: master

Denied Access To Remote Desktop

Detects when an authenticated user who is not allowed to log on remotely attempts to connect to this computer through Remote Desktop. This event can be generated by attackers when searching for available windows servers in the network. This rule detects only users from external network.

• Effort: intermediate

• Changelog:

  • 19/10/2023 - minor - Minor change in selection to reduce false positives.
  • 26/03/2024 - major - Rule's pattern field changed

Failed Logon Followed By A Success From Public IP Addresses

A login from a public IP can indicate a misconfigured firewall or network boundary. The detection look for 5 or more failed attemps followed by a successfull one. The sekoia.tags are used to filter internal Ipv4 addresses.

• Effort: master

• Changelog:

  • 29/05/2024 - major - Adding new field and switching to correlation rule.
  • 04/04/2024 - major - Rule's pattern field changed

Fortigate Firewall Successful External Login

Detects succesfull access to administration console of firewall from another IP address than 127.0.0.1. Prerequisites, check that the firewall logs format corresponds to the rule

• Effort: master

Google Cloud Audit Logs Account Suspended

Detects when Google Cloud Audit Logs notify a user account suspended for a suspicious activity

• Effort: intermediate

Google Cloud Audit Logs Application Added

Detects when an application is added to Google Workspace Domain. This should be an expected change made by an administrator and need to be checked.

• Effort: intermediate

Google Cloud Audit Logs Application Authorized

Detects when an application is authorized to access a Google user account. An exception is currently made for GMAIL because of the large number of hits.

• Effort: master

Google Cloud Audit Logs Attack Warning

Detects when Google Cloud Audit Logs notify an attack warning such as the famous "Government-backed attack".

• Effort: intermediate

Google Workspace Account Warning

Detects a suspicious login, leaked password, or account disabled following suspicious activity.

• Effort: elementary

Google Workspace Admin Creation

Detects when an admin is created or when his role is changed.

• Effort: master

• Changelog:

  • 22/05/2024 - minor - Adding new element to increase detection.

Google Workspace Suspicious Login

Detects a suspicious login reported by google.

• Effort: master

Login Brute-Force On Firewall

Detects successful access to administration console of a firewall after several failure.

• Effort: advanced

Login Brute-Force On FreeRadius

A user has attempted to login several times (brute-force) with error then one success.

• Effort: intermediate

Login Brute-Force On Sekoia.io

Detects successful access to Sekoia.io after several failure.

• Effort: intermediate

• Changelog:

  • 22/05/2024 - minor - Switch the group-by clause to a sekoiaio uuid field.

Microsoft 365 Device Code Authentication

Authentication via a device code is designed for use with input constrained devices. This method can however be abused, particularly in social engineering attacks. Whitelisting based on the organisation's practices is likely required to make this rule useful (e.g. excluding the public IP ranges of the organisation, excluding authentications attempt from managed devices, etc.). Note: if you collect Entra ID SignInLogs, the rule "Microsoft Entra ID (Azure AD) Device Code Authentication" is a better equivalent to this rule.

• Effort: master

Microsoft Entra ID (Azure AD) Device Code Authentication

Authentication via a device code is designed for use with input constrained devices. This method can however be abused, particularly in social engineering attacks. Whitelisting based on the organisation's practices is likely required to make this rule useful (e.g. excluding the public IP ranges of the organisation, excluding authentications attempt from managed devices, etc.)

• Effort: master

Netskope Admin Audit

Audit events for admin activites, from Logins to policies' changes.

• Effort: master

• Changelog:

  • 28/03/2024 - minor - Rule effort was updated to master

Okta Many Passwords Reset Attempt

This rule identifies a high number of Okta user password reset or account unlock attempts. An adversary may attempt to obtain unauthorized access to Okta user accounts using these methods and attempt to blend in with normal activity in their target's environment and evade detection.

• Effort: advanced

Okta Suspicious Activity Reported

Detects when a user reports suspicious activity for their Okta account. These events should be investigated, as they can help security teams identify when an adversary is attempting to gain access to their network.

• Effort: advanced

Okta Unauthorized Access to App

An user tries to access an unauthorized application.

• Effort: master

User Added to Local Administrators

Detects when user accounts are added which could be legitimate activity or a sign of privilege escalation activity, Potential False-Positives Legitimate administrative activity WinRM clients

• Effort: master

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.
  • 04/04/2024 - major - Rule's pattern field changed

Rundll32

PowerShell Execution Via Rundll32

Detects PowerShell Strings applied to rundll as seen in PowerShdll.dll Rule modified

• Effort: intermediate

Modify Registry

Blue Mockingbird Malware

Attempts to detect system changes made by Blue Mockingbird

• Effort: elementary

Chafer (APT 39) Activity

Detects previous Chafer (APT 39) activity attributed to OilRig as reported in Nyotron report in March 2018.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

DHCP Callout DLL Installation

Detects the installation of a Callout DLL via CalloutDlls and CalloutEnabled parameter in Registry, which can be used to execute code in context of the DHCP server (restart required).

• Effort: intermediate

DNS ServerLevelPluginDll Installation

Detects the installation of a plugin DLL via ServerLevelPluginDll parameter in Windows Registry or in command line, which can be used to execute code in context of the DNS server (restart required). To fully use this rule, prerequesites are logging for Registry events in the Sysmon configuration (events 12, 13 and 14).

• Effort: master

Disable .NET ETW Through COMPlus_ETWEnabled

Detects potential adversaries stopping ETW providers recording loaded .NET assemblies. Prerequisites are logging for Registry events or logging command line parameters (both is better). Careful for registry events, if SwiftOnSecurity's SYSMON default configuration is used, you will need to update the configuration to include the .NETFramework registry key path. Same issue with Windows 4657 EventID logging, the registry path must be specified.

• Effort: intermediate

Disable Security Events Logging Adding Reg Key MiniNt

Detects the addition of a key 'MiniNt' to the registry. Upon a reboot, Windows Event Log service will stopped write events. Prerequisites: Logging for Registry events for this specific registry key is needed in the Sysmon configuration (events 12, 13 and 14).

• Effort: master

Disable Workstation Lock

Registry change in order to disable the ability to lock the computer by using CTRL+ALT+DELETE or CTRL+L. This registry key does not exist by default. Its creation is suspicious and the value set to "1" means an activation. It has been used by FatalRAT, but other attacker/malware could probably use it. This rule needs Windows Registry changes (add,modification,deletion) logging which can be done through Sysmon Event IDs 12,13,14.

• Effort: elementary

• Changelog:

  • 21/06/2024 - major - Update detection pattern for ECS fields/value compliance

Disabling SmartScreen Via Registry

Detects when a user disables smartscreen.

• Effort: elementary

FlowCloud Malware

Detects FlowCloud malware from threat group TA410. This requires Windows Event registry logging.

• Effort: elementary

LanManServer Registry Modify

Detects when the LanManServer registry sub-key MaxMpxCt is modified. An attacker can modified this value to increase the maximum number of outstanding client requests supported.

• Effort: elementary

NetNTLM Downgrade Attack

Detects changes in Windows Registry key (LMCompatibilityLevel, NTLMMinClientSec or RestrictSendingNTLMTraffic) which can lead to NetNTLM downgrade attack. The rule requires to log registry keys creation or update, it can be done using Sysmon's Event ID 12,13 and 14.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

OceanLotus Registry Activity

Detects registry keys created in OceanLotus (also known as APT32) attack. Logging for Registry events is needed in the Sysmon configuration (events 12 and 13).

• Effort: intermediate

• Changelog:

  • 21/06/2024 - major - Update detection pattern for ECS fields/value compliance

RDP Port Change Using Powershell

Detects RDP port configuration change using a PowerShell command such as 'Set-ItemProperty -Path "HKLM:\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" -Name PortNumber -Value XXX Restart-Service termservice -force'. Threat actors can change RDP to another port to bypass protections, avoid detection based on the port, or to take full control of the system.

• Effort: intermediate

RDP Sensitive Settings Changed

Detects changes to RDP terminal service sensitive settings. Logging for registry events is needed in the Sysmon configuration (events 12 and 13).

• Effort: advanced

RedMimicry Winnti Playbook Registry Manipulation

Detects actions caused by the RedMimicry Winnti playbook. Logging for Registry events is needed in the Sysmon configuration (events 12 and 13).

• Effort: elementary

Remote Registry Management Using Reg Utility

Remote registry management using REG utility from non-admin workstation. This requires Windows Security events logging.

• Effort: master

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Suspicious Desktopimgdownldr Execution

Detects a suspicious Desktopimgdownldr execution. Desktopimgdownldr.exe is a Windows binary used to configure lockscreen/desktop image and can be abused to download malicious file.

• Effort: intermediate

Suspicious New Printer Ports In Registry

Detects a suspicious printer port creation in Registry that could be an attempt to exploit CVE-2020-1048. The CVE-2020-1048 consists in gaining persistence, privilege by abusing a flaw in the Print Spooler service to execute a payload whose path is stored in the registry key. To fully use this rule, prerequesites are logging for Registry events in the Sysmon configuration (events 12, 13 and 14).

• Effort: master

Ursnif Registry Key

Detects a new registry key created by Ursnif malware. The rule requires to log for Registry Events, which can be done using SYsmon's Event IDs 12,13 and 14.

• Effort: elementary

Wdigest Enable UseLogonCredential

Detects modification of the Windows Registry value of HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\WDigest\UseLogonCredential. This technique is used to extract passwords in clear-text using WDigest. The rule requires to log for Registry Events, which can be done using Sysmon Event IDs 12, 13 and 14.

• Effort: elementary

• Changelog:

  • 08/08/2024 - major - Rule's pattern field changed and pattern improved to cause less false positives.

Component Object Model Hijacking

Windows Registry Persistence COM Key Linking

Detects COM object hijacking via TreatAs subkey. Logging for Registry events is needed in the Sysmon configuration with this kind of rule <TargetObject name="testr12" condition="end with">\TreatAs\(Default)</TargetObject>.

• Effort: master

• Changelog:

  • 14/12/2023 - minor - Exclude common legitimate processes

Trusted Developer Utilities Proxy Execution

MSBuild Abuse

Detection of MSBuild uses by attackers to infect an host. Focuses on XML compilation which is a Metasploit payload, and on connections made by this process which is unusual.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Access Token Manipulation

Jumpcloud Api Key Updated

An API Token has been updated on Jumplcoud portal.

• Effort: advanced

Meterpreter or Cobalt Strike Getsystem Service Installation

Detects the use of getsystem Meterpreter/Cobalt Strike command by detecting some of the techniques being used (technique 1,2 and 5).

• Effort: elementary

Okta API Token created

A new API Token has been created on Okta SSO.

• Effort: advanced

Okta API Token revoked

A new API Token has been deleted on Okta SSO.

• Effort: advanced

Possible RottenPotato Attack

Detects logon events that have characteristics of events generated during an attack leveraging RottenPotato.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Shell PID Injection

Detects when shells PID are listed and injected in another process. It can be performed to reuse sudo token related to shell in order to elevate privilege and maintain persistence.

• Effort: intermediate

Deobfuscate/Decode Files or Information

Correlation Linux Decode And Exec

A Base64 string has been decoded and executed through a pipe. The prerequisites are to enable monitoring of the execve syscall using Auditbeat.

• Effort: intermediate

FromBase64String Command Line

Detects suspicious FromBase64String expressions in command line arguments.

• Effort: master

Microsoft Defender Antivirus Disabled Base64 Encoded

Detects attempts to deactivate/disable Windows Defender through base64 encoded PowerShell command line or scripts.

• Effort: intermediate

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Microsoft Defender Antivirus Set-MpPreference Base64 Encoded

Detects changes of preferences for Windows Defender through command line or PowerShell scripts. Configure Windows Defender using base64-encoded commands is suspicious and could be related to malicious activities.

• Effort: intermediate

Suspicious Microsoft Defender Antivirus Exclusion Command

Detects PowerShell commands aiming to exclude path, process, IP address, or extension from scheduled and real-time scanning. These commands can be used by attackers or malware to avoid being detected by Windows Defender. Depending on the environment and the installed software, this detection rule could raise false positives. We recommend customizing this rule by filtering legitimate processes that use Windows Defender exclusion command in your environment.

• Effort: master

Suspicious Mshta Execution

Detects suspicious mshta.exe execution patterns, either involving file polyglotism, remote file (http, ftp or ldap) or suspicious location. This technique is often used by threat actors.

• Effort: intermediate

• Changelog:

  • 17/10/2024 - minor - Adding similarity_strategy

Suspicious XOR Encoded PowerShell Command Line

Detects suspicious powershell process which includes bxor command, alternative obfuscation method to b64 encoded commands.

• Effort: advanced

Suspicious certutil command

Detects suspicious certutil command which can be used by threat actors to download and/or decode payload.

• Effort: intermediate

• Changelog:

  • 15/02/2023 - minor - "encode" and "decode" were removed as it was causing too much false positives while not being the main usage of the certutil command by attackers.

CMSTP

CMSTP Execution

Detects various indicators of Microsoft Connection Manager Profile Installer execution

• Effort: intermediate

• Changelog:

  • 19/10/2023 - minor - Slight change in selection to reduce false positives. Adding similarity.

MOFComp Execution

Detects rare usage of the Managed Object Format (MOF) compiler on Microsoft Windows. This could be abused by some attackers to load WMI classes.

• Effort: intermediate

BITS Jobs

BITSAdmin Download

Detects command to download file using BITSAdmin, a built-in tool in Windows. This technique is used by several threat actors to download scripts or payloads on infected system.

• Effort: advanced

• Changelog:

  • 06/12/2023 - minor - Adding key words to increase detection.

Indirect Command Execution

CVE 2022-1292

The c_rehash script does not properly sanitise shell metacharacters to prevent command injection. This script is distributed by some operating systems in a manner where it is automatically executed. On such operating systems, an attacker could execute arbitrary commands with the privileges of the script.

• Effort: advanced

Successful Brute Force Login From Internet

Detects a spike of failed login followed by a success one from Internet for a given source and target

• Effort: advanced

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Traffic Signaling

Binary List Tcp

A binary is trying to list TCP connections. The prerequisites are to enable monitoring of the open and openat syscalls using Auditbeat.

• Effort: advanced

Rogue Domain Controller

DC Shadow via Service Principal Name (SPN) creation

Detects DCShadow via new Service Principal Name (SPN) creation

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Exploitation for Defense Evasion

Audit CVE Event

Detects events generated by Windows to indicate the exploitation of a known vulnerability.

• Effort: elementary

• Changelog:

  • 15/07/2024 - major - review filter and improve similarity

Microsoft Malware Protection Engine Crash

Detects a crash of the Microsoft Malware Protection Engine process (MsMpEng.exe), which is suspicious and could be related to an attacker disabling the Windows protection.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

SharePoint Authenticated SSRF

Detects succesful SSRF from an authenticated SharePoint user.

• Effort: elementary

System Binary Proxy Execution

AccCheckConsole Executing Dll

Detects suspicious LOLBIN AccCheckConsole execution with parameters as used to load an arbitrary DLL.

• Effort: advanced

CMSTP Execution

Detects various indicators of Microsoft Connection Manager Profile Installer execution

• Effort: intermediate

• Changelog:

  • 19/10/2023 - minor - Slight change in selection to reduce false positives. Adding similarity.

CMSTP UAC Bypass via COM Object Access

Detects UAC Bypass Attempt Using Microsoft Connection Manager Profile Installer Autoelevate-capable COM Objects

• Effort: intermediate

• Changelog:

  • 28/05/2024 - minor - Add pattern to filter to improve coverage

CVE-2017-11882 Microsoft Office Equation Editor Vulnerability

Detects the exploitation of CVE-2017-11882 vulnerability. The Microsoft Office Equation Editor has no reason to do a network request or drop an executable file. This requires a sysmon configuration with file and network events.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

CertOC Loading Dll

Detects when a user installs certificates by using CertOC.exe to loads the target DLL file.

• Effort: intermediate

Control Panel Items

Detects the malicious use of a control panel item

• Effort: advanced

Dynwrapx Module Loading

Detects the loading of DynamicWrapperX (Dynwrapx). It is used by some malware in their infection chain and could help to detect its usage from vbs/wscript/cscript scripts. This is based on Microsoft Windows Sysmon events (Event ID 7).

• Effort: advanced

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Empire Monkey Activity

Detects EmpireMonkey APT reported Activity

• Effort: elementary

Equation Group DLL_U Load

Detects a specific tool and export used by EquationGroup

• Effort: elementary

Explorer Process Executing HTA File

Detects a suspicious execution of an HTA file by the explorer.exe process. This unusual activity was observed when running IcedID malspam.

• Effort: intermediate

IcedID Execution Using Excel

Detects Excel spawning a process (rundll32 or wmic) running suspicious command-line. This behaviour could correspond to IcedID activity.

• Effort: elementary

MOFComp Execution

Detects rare usage of the Managed Object Format (MOF) compiler on Microsoft Windows. This could be abused by some attackers to load WMI classes.

• Effort: intermediate

Malspam Execution Registering Malicious DLL

Detects the creation of a file in the C:\Datop folder, or DLL registering a file in the C:\Datop folder. Files located in the Datop folder are very characteristic of malspam execution related to Qakbot or SquirrelWaffle. Prerequisites are Logging for File Creation events, which can be done in the Sysmon configuration (events 11), for the first part of the pattern (TargetFilename).

• Effort: elementary

MavInject Process Injection

Detects process injection using the signed Windows tool Mavinject32.exe (which is a LOLBAS)

• Effort: intermediate

Mshta JavaScript Execution

Identifies suspicious mshta.exe commands that execute JavaScript supplied as a command line argument.

• Effort: elementary

PowerShell Execution Via Rundll32

Detects PowerShell Strings applied to rundll as seen in PowerShdll.dll Rule modified

• Effort: intermediate

SquirrelWaffle Malspam Execution Loading DLL

Detects cscript running suspicious command to load a DLL. This behavior has been detected in SquirrelWaffle campaign.

• Effort: intermediate

Suspicious Control Process

Detects suspicious execution of control.exe process when used to execute a DLL file.

• Effort: advanced

Suspicious DLL Loading By Ordinal

Detects suspicious DLL Loading by ordinal number in a non legitimate or rare folders. For example, Sofacy (APT28) used this technique to load their Trojan in a campaign of 2018.

• Effort: intermediate

Suspicious Desktopimgdownldr Execution

Detects a suspicious Desktopimgdownldr execution. Desktopimgdownldr.exe is a Windows binary used to configure lockscreen/desktop image and can be abused to download malicious file.

• Effort: intermediate

Suspicious Mshta Execution

Detects suspicious mshta.exe execution patterns, either involving file polyglotism, remote file (http, ftp or ldap) or suspicious location. This technique is often used by threat actors.

• Effort: intermediate

• Changelog:

  • 17/10/2024 - minor - Adding similarity_strategy

Suspicious Regasm Regsvcs Usage

catch abuse of regsvcs and regasm lolbin by attacker

• Effort: advanced

• Changelog:

  • 27/09/2023 - major - Rule creation

Suspicious Regsvr32 Execution

Detects suspicious regsvr32.exe executions, either regsvr32 registering a DLL in an unusual repository (temp/, appdata/ or public/), or regsvr32 executed by an unusual parent process, or regsvr32 executing an unusual process, or regsvr32 registering a media file and not a DLL (as seen in IcedID campaigns), or regsvr32 registering a ocx file in appdata/.

• Effort: advanced

• Changelog:

  • 23/11/2023 - major - Extended detection and added filter

Suspicious Rundll32.exe Execution

The process rundll32.exe executes a newly dropped DLL with update /i in the command line. This specific technic was observed at least being used by the IcedID loading mechanism dubbed Gziploader.

• Effort: intermediate

• Changelog:

  • 21/09/2023 - minor - Extend to some usage without dll filename

Suspicious Taskkill Command

Detects rare taskkill command being used. It could be related to Baby Shark malware.

• Effort: intermediate

Suspicious Windows Installer Execution

Detects suspicious execution of the Windows Installer service (msiexec.exe) which could be used to install a malicious MSI package hosted on a remote server.

• Effort: intermediate

xWizard Execution

Detects the execution of Xwizard tool with specific arguments which utilized to run custom class properties.

• Effort: master

XSL Script Processing

WMIC Loading Scripting Libraries

Detects threat actors proxy executing code and bypassing application controls by leveraging wmic and the /FORMAT argument switch to download and execute an XSL file (i.e js, vbs, etc). The rule requires to log Loaded DLLs to work properly, which can be done using Sysmon Event ID 7.

• Effort: master

XSL Script Processing And SquiblyTwo Attack

Detection of an attack where adversaries may bypass application control and obscure execution of code by embedding scripts inside XSL files. Another variation of this technique, dubbed "Squiblytwo", involves to invoke JScript or VBScript within an XSL file.

• Effort: intermediate

File and Directory Permissions Modification

AD Object WriteDAC Access

Detects WRITE_DAC access to a domain object. This requires Windows Event ID 4662.

• Effort: advanced

• Changelog:

  • 21/11/2023 - minor - Rule's effort level has been changed to advanced as legitimate administrator actions can trigger the rule.

File Or Folder Permissions Modifications

Adversaries may modify file or directory permissions/attributes to evade access control lists (ACLs) and access protected files.

• Effort: master

File and Directory Permissions Modification

Detects the use of chmod to give high level permissions to file that might be binary files. The prerequisites are to enable monitoring of the fchmodat, chmod and fchmod syscalls using Auditbeat.

• Effort: advanced

ICacls Granting Access To All

Detects suspicious icacls command granting access to all, used by the ransomware Ryuk to delete every access-based restrictions on files and directories. ICacls is a built-in Windows command to interact with the Discretionary Access Control Lists (DACLs) which can grand adversaries higher permissions on specific files and folders.

• Effort: elementary

Linux Remove Immutable Attribute

Adversaries may used chattr utility to alter file and folder attributes to control sudden operations like the deletion and modification of files.

• Effort: intermediate

Domain or Tenant Policy Modification

Creation or Modification of a GPO Scheduled Task

Detects lateral movement using GPO scheduled task, often used to deploy ransomware at scale. This rule is based on the EventID 5145 which is specific to Windows Servers. The advanced audit policy setting Object Access > Audit Detailed File Share must be configured for Success/Failure.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Domain Trust Created Or Removed

A trust was created or removed to a domain. An attacker could perform that in order to do lateral movement easily between domains or shutdown the ability of two domains to communicate.

• Effort: advanced

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

ESET Protect Set Policy

Detects when a new policy is set or removed.

• Effort: master

GPO Executable Delivery

Detects MSI binaries run through GPOs.

• Effort: intermediate

Jumpcloud Policy Modified

Detects when a Jumpcloud policy is modified.

• Effort: intermediate

Microsoft Entra ID (Azure AD) Domain Trust Modification

Adversaries may add new domain trusts or modify the properties of existing domain trusts to evade defenses and/or elevate privileges. Confirm the added or modified target domain/URL is legitimate administrator behavior.

• Effort: elementary

Okta Policy Modified or Deleted

Detects when an Okta policy is modified or deleted.

• Effort: advanced

Okta Policy Rule Modified or Deleted

Detects when an Okta Policy Rule is Modified or Deleted.

• Effort: advanced

Privileged AD Builtin Group Modified

Detects changes to privileged AD builtin groups in Active Directory that could indicate malicious or unexpected administrative activity. This detection rule detects changes on specific groups that are Administrators (S-1-5--500), Domain Admins (S-1-5--512), Enterprise Admins (S-1-5--519), Schema Admins (S-1-5--518), Account Operators (S-1-5-32-548) and Backup Operators (S-1-5-32-551).

• Effort: master

• Changelog:

  • 10/07/2023 - minor - Added AD groups and change to effort master.
  • 26/03/2024 - major - Rule's pattern field changed

Tenable Identity Exposure / Alsid Critical Severity Alert

Tenable Identity Exposure / Alsid raised a critical severity alert.

• Effort: master

Tenable Identity Exposure / Alsid High Severity Alert

Tenable Identity Exposure / Alsid raised an alert.

• Effort: master

Abuse Elevation Control Mechanism

CMSTP UAC Bypass via COM Object Access

Detects UAC Bypass Attempt Using Microsoft Connection Manager Profile Installer Autoelevate-capable COM Objects

• Effort: intermediate

• Changelog:

  • 28/05/2024 - minor - Add pattern to filter to improve coverage

COM Hijack Via Sdclt

Detects changes to 'HKCU\Software\Classes\Folder\shell\open\command\DelegateExecute', to bypass UAC using 'sdclt.exe'.

• Effort: intermediate

Citrix NetScaler (ADC) Actions Blocked

This rule aims to detect a large amount of actions blocked performed from the same source.

• Effort: advanced

Google Workspace Bypass 2FA

Detects when user tries to bypass the 2FA.

• Effort: master

HTML Smuggling Suspicious Usage

Based on several samples from different botnets, this rule aims at detecting HTML infection chain by looking for HTML created files followed by suspicious files being executed.

• Effort: intermediate

Linux Capabilities Discovery

Linux capabilities are special attributes in the Linux kernel that grant processes and binary executables specific privileges that are normally reserved for processes whose effective user ID is 0 (The root user, and only the root user, has UID 0). This rule aims to detect discovery of such capabilities on the Linux system. The prerequisites are to enable monitoring of the execve and getxattr syscalls using Auditbeat.

• Effort: intermediate

Okta User Impersonation Access

A user has initiated a session impersonation granting them access to the environment with the permissions of the user they are impersonating. This would likely indicate Okta administrative access and should only ever occur if requested and expected.

• Effort: advanced

Reconnaissance Commands Activities

Based on Cynet, Microsoft and Kaspersky analysis of Qakbot, this rule tries to detect some discovery TTPs.

• Effort: intermediate

Setuid Or Setgid Usage

Detects the usage of a setuid or a setgid. The prerequisites are to enable monitoring of the setuid and setgid syscalls using Auditbeat.

• Effort: intermediate

Shell PID Injection

Detects when shells PID are listed and injected in another process. It can be performed to reuse sudo token related to shell in order to elevate privilege and maintain persistence.

• Effort: intermediate

UAC Bypass Using Fodhelper

Detects UAC bypass method using Fodhelper after setting the proper registry key, used in particular by Agent Tesla (RAT) or more recently by Earth Luscas. Prerequisites are logging for Registry events in the Sysmon configuration (events 12 and 13).

• Effort: intermediate

• Changelog:

  • 21/06/2024 - major - Update detection pattern for ECS fields/value compliance

UAC Bypass Via Sdclt

Detects changes to HKCU\Software\Classes\exefile\shell\runas\command\isolatedCommand by an attacker in order to bypass User Account Control (UAC)

• Effort: elementary

UAC Bypass via Event Viewer

Detects UAC bypass method using Windows event viewer.

• Effort: intermediate

• Changelog:

  • 21/11/2023 - minor - Improve filter to reduce false positives and clarified the rule pattern.
  • 21/09/2023 - minor - Improve filter to reduce false positives

Unusual Process Executed in Temporary Directory

Identifies processes running in a temporary folder. This is sometimes done by adversaries to hide malware. The prerequisites are to enable monitoring of the execve syscall using Auditbeat.

• Effort: master

Use Alternate Authentication Material

Abusing Azure Browser SSO

Detects abusing Azure Browser SSO by requesting OAuth 2.0 refresh tokens for an Azure-AD-authenticated Windows user (i.e. the machine is joined to Azure AD and a user logs in with their Azure AD account) wanting to perform SSO authentication in the browser. An attacker can use this to authenticate to Azure AD in a browser as that user. This technique leverages the COM object (CoCreateInstance), which loads the DLL "C:\Windows\System32\MicrosoftAccountTokenProvider.dll", to get an authentication token. Monitoring the load of this DLL can detect an attacker abusing this technique. More details on this technique are available in the article in the source section. The prerequisite is to log for Loaded DLLs, it can be done using the Sysmon Event ID 7 (DLL image loaded by process).

• Effort: master

Potential RDP Connection To Non-Domain Host

Detects logons using NTLM to hosts that are potentially not part of the domain using RDP (TermSrv). Event ID 8001 corresponds to outgoing NTLM authentication traffic and TermSrv stands for RDP Terminal Services Server. Check if the contacted host is legitimate. To use this detection rule, enable logging of outbound NTLM authentications on all domain controllers, using the following Group Policy (GPO) - Computer Configuration > Policies > Windows Settings > Security Settings > Local Policies > Security Options > Network security: Restrict NTLM: Outgoing NTLM traffic to remote servers -> Define this policy setting: Audit all.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Rubeus Tool Command-line

Detects command line parameters used by Rubeus, a toolset to interact with Kerberos and abuse it.

• Effort: advanced

Successful Overpass The Hash Attempt

Detects successful logon with logon type 9 (NewCredentials) which matches the Overpass the Hash behavior of e.g Mimikatz's sekurlsa::pth module.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Subvert Trust Controls

Certificate Authority Modification

Installation of new certificate(s) in the Certificate Authority can be used to trick user when spoofing website or to add trusted destinations.

• Effort: master

Microsoft Intune Non-Compliant Device

Detects Microsoft Intune reporting a device in a non-compliant state. This can indicate either a misconfiguration in Intune or a change of configuration on said device.

• Effort: advanced

Suspicious certutil command

Detects suspicious certutil command which can be used by threat actors to download and/or decode payload.

• Effort: intermediate

• Changelog:

  • 15/02/2023 - minor - "encode" and "decode" were removed as it was causing too much false positives while not being the main usage of the certutil command by attackers.

Modify Authentication Process

1Password EPM MFA Disable

Detects when the MFA for 1Password is disabled.

• Effort: master

Active Directory Shadow Credentials

Detects alternative credentials material adding. Attackers can abuse msDS-KeyCredentialLink and create a key pair to obtain a persistent and stealthy access to the target user or computer.

• Effort: elementary

Google Workspace MFA changed

Detects when the settings for the MFA are modified.

• Effort: master

Google Workspace Password Change

Detects when a password is changed. An attacker can perform this action to impact the availability of the account.

• Effort: master

• Changelog:

  • 20/06/2024 - minor - Adding new element to increase detection.

KeePass Config XML In Command-Line

Detects a command-line interaction with the KeePass Config XML file. It could be used to retrieve informations or to be abused for persistence.

• Effort: intermediate

Microsoft Entra ID (Azure AD) MFA Method Change

This rule detects when an user makes a change to the multifactor authentication methods for their account. In environments where this rule is too noisy, alert filters should be applied, e.g. to focus on privileged accounts, or unusual source network locations.

• Effort: master

Impair Defenses

AMSI Deactivation Using Registry Key

The rule detects attempts to deactivate/disable the AMSI provider by deleting the associated registry key.

• Effort: master

AWS CloudTrail Config DeleteConfigurationRecorder

Detects when the Configuration Recorder was deleted. The configuration recorder is used to detect changes in your resource configurations and capture these changes as configuration items.

• Effort: intermediate

AWS CloudTrail Config Disable Channel/Recorder

Detects AWS Config Service disabling channel or recorder

• Effort: elementary

AWS CloudTrail Disable MFA

Detects a user disabling the multi factor authentication mechanism for its account. It could be a sign of malicious activity.

• Effort: intermediate

AWS CloudTrail EC2 Security Group Modified

Detects when an AWS EC2 security group has been modified

• Effort: master

AWS CloudTrail EventBridge Rule Disabled Or Deleted

Detects when an attacker is trying to evade defenses by deleting or disabling EventBridge rules

• Effort: master

AWS CloudTrail GuardDuty Detector Deleted

Detects when an attacker is trying to evade defenses by deleting a GuardDuty detector

• Effort: intermediate

• Changelog:

  • 08/11/2023 - minor - Added filter to reduce false positives
  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

AWS CloudTrail GuardDuty Detector Suspended

Detects the suspension of the GuardDuty service

• Effort: intermediate

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

AWS CloudTrail GuardDuty Disruption

Detects updates of the GuardDuty list of trusted IPs, perhaps to disable security alerts against malicious IPs

• Effort: intermediate

AWS CloudTrail IAM AWSCompromisedKeyQuarantineV2

Detects when AWS CloudTrail detected an AWS Access Key that was compromised, and then quarantined by AWS. This could indicate for instance that the private key was found on a GitHub public repository.

• Effort: elementary

AWS CloudTrail IAM AddClientIDToOpenIDConnectProvider

Detects the addition of a Client ID to an existing identity provider that supports OpenID Connect.

• Effort: intermediate

AWS CloudTrail IAM ChangePassword

Detects when an IAM user wants to change its password.

• Effort: advanced

AWS CloudTrail IAM CreateOpenIDConnectProvider

Detects the creation of an IAM entity to describe an identity provider that supports OpenID Connect.

• Effort: intermediate

AWS CloudTrail IAM CreateSAMLProvider

Detects when an IAM user creates a SAML provider, which could allow third-party connection and therefore could be used by attackers.

• Effort: intermediate

AWS CloudTrail IAM DeleteOpenIDConnectProvider

Detects the deletion of an IAM entity to describe an identity provider that supports OpenID Connect.

• Effort: intermediate

AWS CloudTrail IAM DeleteSAMLProvider

Detects when an IAM user deletes a SAML provider, which could be performed by attackers to cover their tracks.

• Effort: intermediate

AWS CloudTrail IAM RemoveClientIDFromOpenIDConnectProvider

Detects when a Client ID is removed from an identity provider that supports OpenID Connect. Could be used by attackers for sabotage or to cover their tracks.

• Effort: intermediate

AWS CloudTrail IAM UpdateOpenIDConnectProviderThumbprint

Detects the update of a ThumbPrint from an identity provider that supports OpenID Connect. This could be a sign of an attacker adding a trusted certificate.

• Effort: intermediate

AWS CloudTrail IAM UpdateSAMLProvider

Detects when an IAM user updates a SAML provider. Attackers could perform that to be stealthy by adding a third-party connection into an existing SAML provider.

• Effort: intermediate

AWS CloudTrail Important Change

Detects disabling, deleting and updating of a Trail source which could be done by some attackers trying to masquerade their activity.

• Effort: advanced

AWS CloudTrail Remove Flow logs

Detects when an attacker is removing Flow Logs to cover their tracks

• Effort: advanced

• Changelog:

  • 15/11/2023 - minor - Changing effort level.

Address Space Layout Randomization (ASLR) Alteration

ASLR is a security feature used by the Operating System to mitigate memory exploit, attacker might want to disable it

• Effort: intermediate

Clear EventLogs Through CommandLine

Detects a command that clears event logs which could indicate an attempt from an attacker to erase its previous traces.

• Effort: intermediate

Debugging Software Deactivation

Deactivation of some debugging softwares using taskkill command. It was observed being used by Ransomware operators.

• Effort: elementary

Disable .NET ETW Through COMPlus_ETWEnabled

Detects potential adversaries stopping ETW providers recording loaded .NET assemblies. Prerequisites are logging for Registry events or logging command line parameters (both is better). Careful for registry events, if SwiftOnSecurity's SYSMON default configuration is used, you will need to update the configuration to include the .NETFramework registry key path. Same issue with Windows 4657 EventID logging, the registry path must be specified.

• Effort: intermediate

Disable Security Events Logging Adding Reg Key MiniNt

Detects the addition of a key 'MiniNt' to the registry. Upon a reboot, Windows Event Log service will stopped write events. Prerequisites: Logging for Registry events for this specific registry key is needed in the Sysmon configuration (events 12, 13 and 14).

• Effort: master

Disable Task Manager Through Registry Key

Detects commands used to disable the Windows Task Manager by modifying the proper registry key in order to impair security tools. This technique is used by the Agent Tesla RAT, among others.

• Effort: elementary

• Changelog:

  • 21/06/2024 - major - Update detection pattern for ECS fields/value compliance
  • 25/06/2024 - major - Fix pattern selection

Disable Windows Defender Credential Guard

Detects registry keys being changed to disable Windows Defender Credential Guard. The rule requires to log Registry Keys modifications or creations, which can be done using Sysmon Event IDs 12,13 and 14.

• Effort: intermediate

Disabled IE Security Features

Detects from the command lines or the registry, changes that indicate unwanted modifications to registry keys that disable important Internet Explorer security features. This has been used by attackers during Operation Ke3chang.

• Effort: advanced

Disabled Service

Service disabling can be abused by attacker to deny security mecanisms (eg: firewall, EDR, ect) and it is also often used by cryptominer to exploit as much RAM & CPU as possible on infected host. The prerequisites are to enable monitoring of the truncate, rename and unlink syscalls using Auditbeat.

• Effort: advanced

Dism Disabling Windows Defender

Detects windows defender disabled by dism.

• Effort: advanced

ETW Tampering

Detects a command that clears or disables any ETW Trace log which could indicate a logging evasion

• Effort: intermediate

• Changelog:

  • 08/11/2023 - minor - Added filter to reduce false positives

FLTMC command usage

Detects the use of fltmc to list and load/unload a filter driver.

• Effort: advanced

Fail2ban Unban IP

An IP was ubaned by Fail2ban. It could be use to allow malicous traffic.

• Effort: advanced

GitHub Delete Action

Detects a Delete/Destroy action in GitHub audit logs.

• Effort: advanced

GitHub Dependabot Or Vulnerability Alerts Disabled

Detects dependabot or vulnerability alerts being disabled. Dependabot performs a scan to detect insecure dependencies, and sends Dependabot alerts.

• Effort: advanced

GitHub High Risk Configuration Disabled

Detects a configuration being disabled in GitHub. It detects only configuration judged as highly risky if disabled. An organization should adapt this rule according to its environment.

• Effort: advanced

GitHub New Organization Member

Detects when a member is added or invited to a GitHub organization.

• Effort: advanced

GitHub Outside Collaborator Detected

Detects an outside collaborator being removed or having its permissions changed.

• Effort: advanced

Google Cloud Audit Logs Trusted Domain Added

Detects when a domain name is added to Google Workspace Trusted Domain. This could be used by an attacker to bypass some security controls or just be a legit admin action.

• Effort: intermediate

Loss Of Parsing

Spots the loss of events parsing by Sekoia.io, could indicate a loss of valid events flow. The strategy is to focus on less frequent event to limit the impact of the skewness in the count distribution law.

• Effort: master

MalwareBytes Uninstallation

Detects command line being used by attackers to uninstall Malwarebytes.

• Effort: intermediate

Microsoft Defender Antivirus Configuration Changed

Detects when an feature configuration change is made to Microsoft Windows Defender (enabling or disabling real-time protection, etc.)

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Microsoft Defender Antivirus Disable Scheduled Tasks

The rule detects attempts to deactivate/disable Windows Defender scheduled tasks via command line or PowerShell scripts.

• Effort: intermediate

• Changelog:

  • 04/07/2024 - minor - Adding new commands to increase detection.

Microsoft Defender Antivirus Disable SecurityHealth

The rule detects attempts to deactivate/disable Windows Defender SecurityHealth through command line, PowerShell scripts, and registry. To fully use this rule Windows Registry logging is recommended.

• Effort: intermediate

Microsoft Defender Antivirus Disable Services

The rule detects attempts to deactivate/disable Windows Defender through command line and registry.

• Effort: intermediate

Microsoft Defender Antivirus Disable Using Registry

The rule detects attempts to deactivate/disable Microsoft Defender Antivirus using registry modification via command line or PowerShell scripts.

• Effort: master

Microsoft Defender Antivirus Disabled Base64 Encoded

Detects attempts to deactivate/disable Windows Defender through base64 encoded PowerShell command line or scripts.

• Effort: intermediate

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Microsoft Defender Antivirus Exclusion Configuration

Detects when an exclusion configuration change is made to Microsoft Windows Defender (adding either a path or process bypass)

• Effort: master

• Changelog:

  • 07/08/2023 - major - Considering the amount of false positives the rule effort has been changed to master. Furthermore a filter has been added.
  • 26/03/2024 - major - Rule's pattern field changed

Microsoft Defender Antivirus Restoration Abuse

The rule detects attempts to abuse Windows Defender file restoration tool. The Windows Defender process is allowed to write files in its own protected directory. This functionality can be used by a threat actor to overwrite Windows Defender files in order to prevent it from running correctly or use Windows Defender to execute a malicious DLL.

• Effort: intermediate

Microsoft Defender Antivirus Set-MpPreference Base64 Encoded

Detects changes of preferences for Windows Defender through command line or PowerShell scripts. Configure Windows Defender using base64-encoded commands is suspicious and could be related to malicious activities.

• Effort: intermediate

Microsoft Defender Antivirus Signatures Removed With MpCmdRun

Detects attempts to remove Windows Defender Signatures using MpCmdRun legitimate Windows Defender executable. No signatures mean Windows Defender will be less effective (or completely useless depending on the option used).

• Effort: elementary

Microsoft Defender Antivirus Tampering Detected

Detection of Windows Defender Tampering, from definitions' deletion to deactivation of parts or all of Defender.

• Effort: advanced

• Changelog:

  • 07/08/2023 - minor - Rule effort changed from intermediate to advanced considering the number of false positives observed.
  • 26/03/2024 - major - Rule's pattern field changed

Microsoft Intune Policy Change

Detects edits, deletions or creations made to an organization Microsoft Intune policies.

• Effort: intermediate

Microsoft Malware Protection Engine Crash

Detects a crash of the Microsoft Malware Protection Engine process (MsMpEng.exe), which is suspicious and could be related to an attacker disabling the Windows protection.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

NetNTLM Downgrade Attack

Detects changes in Windows Registry key (LMCompatibilityLevel, NTLMMinClientSec or RestrictSendingNTLMTraffic) which can lead to NetNTLM downgrade attack. The rule requires to log registry keys creation or update, it can be done using Sysmon's Event ID 12,13 and 14.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

NetSh Used To Disable Windows Firewall

Detects NetSh commands used to disable the Windows Firewall

• Effort: intermediate

Netsh Allow Command

Netsh command line to allow a program to pass through firewall.

• Effort: advanced

Netsh Allowed Python Program

Detects netsh command that performs modification on Firewall rules to allow the program python.exe. This activity is most likely related to the deployment of a Python server or an application that needs to communicate over a network. Threat actors could use it for data extraction, hosting a webshell or else.

• Effort: intermediate

Netsh Port Forwarding

Detects netsh commands that enable a port forwarding between to hosts. This can be used by attackers to tunnel RDP or SMB shares for example.

• Effort: intermediate

• Changelog:

  • 15/02/2024 - minor - Added filter to reduce false positives

Netsh Port Opening

Detects netsh commands that opens a specific port. Can be used by malware or attackers for lateralisation/exfiltration (e.g. SMB/RDP opening).

• Effort: master

Netsh Program Allowed With Suspicious Location

Detects Netsh commands that allow a suspcious application location on Windows Firewall, seen on kasidet worm. Last part of the existing rule (commandline startwith) was not added to this rule because it is not relevant.

• Effort: advanced

• Changelog:

  • 29/11/2023 - minor - Update regex pattern to insensitive case

Netsh RDP Port Forwarding

Detects netsh commands that configure a port forwarding of port 3389 used for RDP. This is commonly used by attackers during lateralization on windows environments.

• Effort: elementary

Netsh RDP Port Opening

Detects netsh commands that opens the port 3389 used for RDP, used in Sarwent Malware.

• Effort: intermediate

Okta Blacklist Manipulations

Detects when some manipulation are done in blacklist configurations.

• Effort: intermediate

Okta MFA Disabled

A MFA has beed disabled in Okta SSO. This is a common behavior to gain permanent access over a system.

• Effort: intermediate

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.

Okta Network Zone Deactivated

Detects attempts to deactivate an Okta network zone. Okta network zones can be configured to limit or restrict access to a network based on IP addresses or geolocations. An adversary may attempt to modify, delete, or deactivate an Okta network zone in order to remove or weaken an organization's security controls.

• Effort: advanced

Okta Network Zone Deleted

Detects attempts to delete an Okta network zone. Okta network zones can be configured to limit or restrict access to a network based on IP addresses or geolocations. An adversary may attempt to modify, delete, or deactivate an Okta network zone in order to remove or weaken an organization's security controls.

• Effort: advanced

Okta Network Zone Modified

Detects attempts to modify an Okta network zone. Okta network zones can be configured to limit or restrict access to a network based on IP addresses or geolocations. An adversary may attempt to modify, delete, or deactivate an Okta network zone in order to remove or weaken an organization's security controls.

• Effort: intermediate

Okta Security Threat Configuration Updated

Detects when the threat configuration has been updated in Okta.

• Effort: intermediate

Package Manager Alteration

Package manager (eg: apt, yum) can be altered to install malicious software. To ensure full performance on this rule, auditbeat intake must be configure with the module file_integrity containing path mentionned in the pattern.

• Effort: advanced

PowerShell AMSI Deactivation Bypass Using .NET Reflection

Detects Request to amsiInitFailed that can be used to disable AMSI (Antimalware Scan Interface) Scanning. More information about Antimalware Scan Interface https://docs.microsoft.com/en-us/windows/win32/amsi/antimalware-scan-interface-portal.

• Effort: advanced

• Changelog:

  • 13/06/2024 - minor - Changing effort level and adding similarity strategy to regroup alerts.

Powershell AMSI Bypass

This rule aims to detect attempts to bypass AMSI in powershell using specific techniques.

• Effort: advanced

Process Anti Debug Checking

Entries in /proc/self/status are used by malware to checks if current process is being debug. The prerequisites are to enable monitoring of the openat, openat2, open and open_by_handle_at syscalls using Auditbeat.

• Effort: master

Python Opening Ports

Detects when the Windows Filtering Platform has permitted Python.exe to listen on a port for incoming connections. This activity is most likely related to the deployment of a Python server or an application that needs to communicate over a network. Threat actors could use it for data extraction, hosting a webshell or else.

• Effort: advanced

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Raccine Uninstall

Detects commands that indicate a Raccine removal from an end system. Raccine is a free ransomware protection tool.

• Effort: elementary

Rubycat PROVEIT Admin Service Modified

Rubycat PROVEIT has detected a service modification that could require some review if not expected.

• Effort: master

SELinux Disabling

An attacker can disable SELinux to make workstation or server compromise easier as it disables several protections.

• Effort: intermediate

Suspect Svchost Memory Access

Detects suspect access to svchost process memory such as that used by Invoke-Phantom (v1.0) to kill the winRM windows event logging service.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Suspicious Driver Loaded

Checks the registry key for suspicious driver names that are vulnerable most of the time and loaded in a specific location by the KDU tool from hfiref0x. Some drivers are used by several SysInternals tools, which should have been whitelisted in the filter condition. The driver named "DBUtilDrv2" has been removed as it caused too many false positives unfortunately. It can be added under "drv_name" if more coverage is wanted. This rule needs registry key monitoring (can be done with Sysmon Event IDs 12,13 and 14).

• Effort: intermediate

• Changelog:

  • 02/01/2024 - minor - improve selection to avoid FP
  • 21/05/2024 - major - editing pattern to avoid FP
  • 25/06/2024 - minor - fix pattern following ECS parsing update

Suspicious Microsoft Defender Antivirus Exclusion Command

Detects PowerShell commands aiming to exclude path, process, IP address, or extension from scheduled and real-time scanning. These commands can be used by attackers or malware to avoid being detected by Windows Defender. Depending on the environment and the installed software, this detection rule could raise false positives. We recommend customizing this rule by filtering legitimate processes that use Windows Defender exclusion command in your environment.

• Effort: master

Suspicious PROCEXP152.sys File Created In Tmp

Detects the creation of the PROCEXP152.sys file in the application-data local temporary folder. This driver is used by Sysinternals Process Explorer but also by KDU (https://github.com/hfiref0x/KDU) or Ghost-In-The-Logs (https://github.com/bats3c/Ghost-In-The-Logs), which uses KDU. Note - Clever attackers may easily bypass this detection by just renaming the driver filename. Therefore just Medium-level and don't rely on it.

• Effort: advanced

TrustedInstaller Impersonation

The rule detects attempts to impersonate TrustedInstaller. TrustedInstaller rights could allow a threat actor to delete or modify protected file or create/delete/modify files in protected folders. This technique is used by threat actors to disable Windows Defender.

• Effort: intermediate

• Changelog:

  • 05/08/2023 - major - Filters were added to reduce false positives and effort level was modified.

WMIC Uninstall Product

Detects products being uninstalled using WMIC command.

• Effort: intermediate

• Changelog:

  • 13/02/2024 - minor - Exclude non-Windows operating systems (false positives)

Windows Defender Deactivation Using PowerShell Script

Detects attempts to deactivate Windows Defender with PowerShell using ScriptBlockLogging.

• Effort: master

Windows Firewall Changes

Detects changes on Windows Firewall configuration

• Effort: master

Hide Artifacts

Hiding Files With Attrib.exe

Detects usage of attrib.exe to hide files from users.

• Effort: advanced

Linux Suspicious Nohup Exec

Detects suspicious usage of nohup which could be leveraged by an attacker to keep a process running or break out from restricted environments

• Effort: intermediate

Microsoft 365 Suspicious Inbox Rule

Business Email Compromise threat actors often create inbox rules to forward, hide, or delete emails containing sensitive information. This rule detects common caracteristics of malicious inbox rules.

• Effort: elementary

• Changelog:

  • 13/03/2024 - minor - Add another suspicious folder.

PowerShell NTFS Alternate Data Stream

Detects writing data into NTFS alternate data streams from PowerShell. Needs Script Block Logging (Event ID 4104)

• Effort: advanced

Suspicious Headless Web Browser Execution To Download File

Detects a suspicious command used to execute a Chromium-based web browser (Chrome or Edge) using the headless mode, meaning that the browser window wouldn't be visible, and the dump mode to download a file. This technique can be used to fingerprint the compromised host, in particular by the Ducktail infostealer.

• Effort: elementary

Hijack Execution Flow

DHCP Callout DLL Installation

Detects the installation of a Callout DLL via CalloutDlls and CalloutEnabled parameter in Registry, which can be used to execute code in context of the DHCP server (restart required).

• Effort: intermediate

DHCP Server Error Failed Loading the CallOut DLL

This rule detects a DHCP server error in which a specified Callout DLL (in registry) could not be loaded.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

DHCP Server Loaded the CallOut DLL

This rule detects a DHCP server in which a specified Callout DLL (in registry) was loaded. This would indicate a succesful attack against DHCP service allowing to disrupt the service or alter the integrity of the responses.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

DNS Server Error Failed Loading The ServerLevelPluginDLL

This rule detects a DNS server error in which a specified plugin DLL (in registry) could not be loaded. This requires the dedicated Windows event provider Microsoft-Windows-DNS-Server-Service.

• Effort: master

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

DNS ServerLevelPluginDll Installation

Detects the installation of a plugin DLL via ServerLevelPluginDll parameter in Windows Registry or in command line, which can be used to execute code in context of the DNS server (restart required). To fully use this rule, prerequesites are logging for Registry events in the Sysmon configuration (events 12, 13 and 14).

• Effort: master

Dynamic Linker Hijacking From Environment Variable

LD_PRELOAD and LD_LIBRARY_PATH are environment variables used by the Operating System at the runtime to load shared objects (library.ies) when executing a new process, attacker can overwrite this variable to attempts a privileges escalation.

• Effort: master

• Changelog:

  • 11/07/2024 - minor - Added filter to reduce false positvives

Elevated Shell Launched By Browser

Detects when openwith.exe is launched with privileges followed by a browser launching an elevated shell. Related to the CVE-2024-38014.

• Effort: master

Exploiting SetupComplete.cmd CVE-2019-1378

Detects exploitation attempts of privilege escalation vulnerability via SetupComplete.cmd and PartnerSetupComplete.cmd described in CVE-2019-1378.

• Effort: intermediate

Hijack Legit RDP Session To Move Laterally

Identifies suspicious file creations in the startup folder of a remote system. An adversary could abuse this to move laterally by dropping a malicious script or executable that will be executed after a reboot or user logon.

• Effort: intermediate

Linux Shared Lib Injection Via Ldso Preload

Detect ld.so.preload modification for shared lib injection, technique used by attackers to load arbitrary code into process

• Effort: intermediate

Suspicious DLL side loading from ProgramData

Detects suspicious DLL side-loading from C:\ProgramData where the DLL is not signed.

• Effort: intermediate

Svchost DLL Search Order Hijack

Detects svchost process hijacking through DLL loading. IKEEXT and SessionEnv service, as they call LoadLibrary on files that do not exist within C:\Windows\System32\ by default. An attacker can place their malicious logic within the PROCESS_ATTACH block of their library and restart the aforementioned services "svchost.exe -k netsvcs" to gain code execution on a remote machine.

• Effort: master

Werfault DLL Injection

Werfault DLL search order look first in the current file, which lets an attacker use th legitimate exe to run its own DLL.

• Effort: intermediate

Windows Registry Persistence COM Search Order Hijacking

Detects potential COM object hijacking leveraging the COM Search Order. Logging for Registry events is needed, it can be done with Sysmon's Event IDs 12 and 13.

• Effort: advanced

• Changelog:

  • 11/01/2024 - minor - Adding filtering for some FPs

Modify Cloud Compute Infrastructure

AWS CloudTrail EC2 CreateVPC

Detects when a VPC is created.

• Effort: advanced

AWS CloudTrail EC2 Subnet Deleted

Detects when an attacker is destroying an EC2 subnet.

• Effort: master

• Changelog:

  • 22/07/2024 - minor - Update action field for ECS one

AWS CloudTrail ECS Cluster Deleted

Detects when an attacker is destroying an AWS ECS Cluster

• Effort: intermediate

AWS CloudTrail IAM Failed User Creation

Detects an attemp to create a user account where the result is an explicit denied.

• Effort: intermediate

AWS CloudTrail IAM Password Policy Updated

Detects an update to the password policy. This could be an attempt to lower accounts security level.

• Effort: intermediate

AWS CloudTrail IAM Policy Changed

Detects change on AWS IAM Policy

• Effort: master

AWS CloudTrail Root ConsoleLogin

Detects a login with a root account on AWS portal. It is a best practice to avoid root account usage for daily tasks and to create an IAM admin user.

• Effort: intermediate

AWS CloudTrail Route 53 Domain Transfer Attempt

Detects when a request in success or failure is made to transfer a domain name to an other AWS account

• Effort: intermediate

AWS CloudTrail Route 53 Domain Transfer Lock Disabled

Detects when the transfer lock feature is disabled on a domain name handled by AWS Route 53 service.

• Effort: elementary

AWS CloudTrail S3 Bucket Replication

Detects a replication rule being enable for a given S3 bucket: it could provide an attacker a way to exfiltrate data.

• Effort: master

Lacework Cloud Security Critical Severity Alert

Detects when a critical alert severity is raised by Lacework. This severity level might indicates a suspicious change in configuration or policy violation.

• Effort: master

Lacework Cloud Security High Severity Alert

Detects when a high alert severity is raised by Lacework. This severity level might indicates a suspicious change in configuration or policy violation.

• Effort: master

Lacework Cloud Security Low Severity Alert

Detects when a low alert severity is raised by Lacework. This severity level might indicates a change in configuration that could be malicious or not.

• Effort: master

Lacework Cloud Security Medium Severity Alert

Detects when a medium alert severity is raised by Lacework. This severity level might indicates a suspicious activity such as new source from user connection.

• Effort: master

Network Boundary Bridging

Loss Of Parsing

Spots the loss of events parsing by Sekoia.io, could indicate a loss of valid events flow. The strategy is to focus on less frequent event to limit the impact of the skewness in the count distribution law.

• Effort: master

SharePoint Authenticated SSRF

Detects succesful SSRF from an authenticated SharePoint user.

• Effort: elementary

Deploy Container

Docker Escape Bind Mount

Catch Docker escape via mount escape followed by chroot

• Effort: intermediate

Reflective Code Loading

Linux Fileless Execution

Process image resolved to memfd syscall. Could be used by adversaries to hide malware

• Effort: intermediate

Credential Access

OS Credential Dumping

Active Directory Database Dump Via Ntdsutil

Detects the dump of ntdis.dit database by using the utility ntdsutil.exe. NTDS.dit database stores Active Directory data, including passwords hashes for all users in the domain.

• Effort: elementary

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Active Directory Replication from Non Machine Account

Detects potential abuse of Active Directory Replication Service (ADRS) from a non machine account to request credentials. It requires a configuration step where the legit service account should be added to the exclusion list.

• Effort: advanced

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Cmdkey Cached Credentials Recon

Detects usage of cmdkey to look for cached credentials.

• Effort: intermediate

Copying Browser Files With Credentials

Detects copy of sensitive data (passwords, cookies, credit cards) included in web browsers files.

• Effort: elementary

Copying Sensitive Files With Credential Data

Detects copy of files with well-known filenames (sensitive files with credential data) using esentutl. This requires Windows Security event log with the Detailed File Share logging policy enabled.

• Effort: elementary

Credential Dump Tools Related Files

Detects processes or file names related to credential dumping tools and the dropped files they generate by default.

• Effort: advanced

• Changelog:

  • 07/08/2024 - major - Effort level was changed. Rule pattern initial field was changed to be ECS compliant and match on more intakes. A process was excluded and a filter was added, both to avoid generating too much false positives.

Credential Dumping By LaZagne

Detects LSASS process access by LaZagne for credential dumping.

• Effort: elementary

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Credential Dumping Tools Service Execution

Detects well-known credential dumping tools execution via service execution

• Effort: intermediate

Credential Dumping-Tools Common Named Pipes

Detects well-known credential dumping tools execution via specific named pipes. Prerequisites: Logging for PipeEvents is needed in Sysmon config

• Effort: master

DCSync Attack

Detects DCSync attack, it is highly likely that the post-exploitation tool Mimikatz was executed.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed
  • 05/09/2024 - minor - Changing name of elements.

DPAPI Domain Backup Key Extraction

Detects tools extracting LSA secret DPAPI domain backup key from Domain Controllers

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Dumpert LSASS Process Dumper

Detects the use of Dumpert process dumper, which dumps the lsass.exe process memory

• Effort: elementary

Grabbing Sensitive Hives Via Reg Utility

Detects dump of SAM, System or Security hives using reg.exe utility. Adversaries may attempt to dump these Windows Registry to retrieve password hashes and access credentials.

• Effort: intermediate

• Changelog:

  • 02/01/2024 - minor - Rule was improved to have broader detection and filters were added.

HackTools Suspicious Names

Quick-win rule to detect the default process names or file names of several HackTools.

• Effort: elementary

• Changelog:

  • 11/12/2024 - minor - Added a default similarity based on host name and user name to avoid too many alerts.

HackTools Suspicious Process Names In Command Line

Detects the default process name of several HackTools and also check in command line. This rule is here for quickwins as it obviously has many blind spots.

• Effort: intermediate

• Changelog:

  • 11/12/2024 - minor - Added a default similarity based on host name and user name to avoid too many alerts.
  • 10/06/2024 - minor - Added filter to the rule to reduce false positives.
  • 19/06/2023 - minor - Added filter to the rule to reduce false positives.

Impacket Secretsdump.py Tool

Detects credential dumping via secretdump of impacket suite.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

LSASS Access From Non System Account

Detects LSASS Access from Non System Account (e.g. Mimikatz)

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

LSASS Memory Dump

Detects process accessing LSASS memory which is typical for credentials dumping tools. The rule requires Sysmon EventID 10 to work as it is based on the GrantedAccess mask.

• Effort: master

• Changelog:

  • 06/04/2023 - minor - Rule effort has been upgraded to master considering the number of different false positives the rule can trigger.
  • 26/03/2024 - major - Rule's pattern field changed

LSASS Memory Dump File Creation

LSASS memory dump creation using operating systems utilities. Procdump will use process name in output file if no name is specified.

• Effort: intermediate

Load Of dbghelp/dbgcore DLL From Suspicious Process

Detects the load of dbghelp/dbgcore DLL (used to make memory dumps) by suspicious processes. Many tools import dbghelp.dll and / or dbgcore.dll to use the MiniDumpWriteDump function. As an example, SilentTrynity C2 Framework has a module that leverages this API to dump the contents of Lsass.exe and transfer it over the network back to the attacker's machine. Dumpert from OUTFLANK also uses this.

• Effort: advanced

Lsass Access Through WinRM

Detects the access of LSASS.exe process through Windows Remote Management (WinRM) protocol. This is often done using Invoke-Mimikatz -ComputerName command, which uses PSRemoting and therefore WinRM. However, this is not limited to the Mimikatz threat and can be done by other tools as well. This rule needs Process Access monitoring, which can be done using Sysmon's event ID 10.

• Effort: intermediate

Main Memory Dumping

Attacker might want to leverage their permission on the system or steal authentication tokens to third parties software, website, etc. To do so, attacker might try to dump main memory of computer. The prerequisites are to enable monitoring of the openat and open syscalls using Auditbeat.

• Effort: advanced

Malicious Service Installations

Generic and known malicious service installation that appear in cases of lateral movement, credential dumping and other suspicious activity. It detects the use of PAExec, Wannacry commonly used malicious service, APT29 known malicious service name and net user service file name which is known as a sign of persistence.

• Effort: elementary

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Mimikatz Basic Commands

Detects Mimikatz most popular commands.

• Effort: elementary

• Changelog:

  • 06/04/2023 - minor - Added a filter to the rule as many false positives were observed.

Mimikatz LSASS Memory Access

Detection of in-memory Mimikatz by focusing on processes opening the Local Security Authority (Lsass.exe) process and reading the memory contents of it. This probably means that Mimikatz has been executed on the host, meaning the attacker already has high privileges and is looking to dump credentials, most likely for lateral movement or privilege escalation purposes. The rule requires Sysmon EventID 10 to work as it is based on the GrantedAccess mask.

• Effort: advanced

• Changelog:

  • 06/04/2023 - minor - Whitelisted another SourceImage as it triggered too many false positives.
  • 21/06/2023 - minor - Whitelisted lsm.exe that triggered too many false positives.
  • 26/03/2024 - major - Rule's pattern field changed

NTDS.dit File In Suspicious Directory

The file NTDS.dit is supposed to be located mainly in C:\Windows\NTDS. The rule checks whether the file is in a legitimate directory or not (through file creation events). This is usually really suspicious and could indicate an attacker trying copy the file to then look for users password hashes.

• Effort: advanced

NTDS.dit File Interaction Through Command Line

Detects interaction with the file NTDS.dit through command line. This is usually really suspicious and could indicate an attacker trying copy the file to then look for users password hashes.

• Effort: intermediate

• Changelog:

  • 08/11/2023 - minor - Added filter to reduce false positives

NetNTLM Downgrade Attack

Detects changes in Windows Registry key (LMCompatibilityLevel, NTLMMinClientSec or RestrictSendingNTLMTraffic) which can lead to NetNTLM downgrade attack. The rule requires to log registry keys creation or update, it can be done using Sysmon's Event ID 12,13 and 14.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Password Dumper Activity On LSASS

Detects process handle on LSASS process with certain access mask and object type SAM_DOMAIN

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Process Memory Dump Using Comsvcs

Detects the use of comsvcs in command line to dump a specific process memory. This technique is used by attackers for privilege escalation and pivot.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Filter improved to reduce false positives. On the other hand, some selections were added to improve detection.
  • 10/04/2024 - minor - Rule description was changed due to some mistakes
  • 13/06/2024 - minor - Adding similarity strategy and changing effort level.

Process Memory Dump Using Createdump

Detects the use of createdump.exe in command line to dump the memory of a process. This technique is used by attackers for privilege escalation and pivot.

• Effort: elementary

Process Memory Dump Using Rdrleakdiag

Detects the use of rdrleakdiag.exe in command line to dump the memory of a process. This technique is used by attackers for privilege escalation and pivot.

• Effort: elementary

Process Memory Dumping From proc Filesystem

Attacker might want to leverage their permission on the system or steal authentication to third parties software, website, etc.. To do so, attacker might try to dump memory of interesting process, for instance ftp-server or web server to dig for authentication login and password. The prerequisites are to enable monitoring of the openat and open syscalls using Auditbeat.

• Effort: master

Process Trace Alteration

PTrace syscall provides a means by which one process ("tracer") may observe and control the execution of another process ("tracee") and examine and change the tracee's memory and registers. Attacker might want to abuse ptrace functionnality to analyse memory process. It requires to be admin or set ptrace_scope to 0 to allow all user to trace any process.

• Effort: advanced

RedMimicry Winnti Playbook Dropped File

Detects actions caused by the RedMimicry Winnti playbook

• Effort: elementary

Rubeus Tool Command-line

Detects command line parameters used by Rubeus, a toolset to interact with Kerberos and abuse it.

• Effort: advanced

SAM Registry Hive Handle Request

Detects handles requested to SAM registry hive

• Effort: advanced

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Suspicious CommandLine Lsassy Pattern

Detects the characteristic lsassy loop used to identify lsass PIDs

• Effort: intermediate

Suspicious SAM Dump

Detects suspicious SAM dump to AppData repository, as cause by QuarksPwDump and other password dumpers. Logging for Microsoft-Windows-Kernel-General Event ID 16 or Sysmon Event ID 11 is needed.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Transfering Files With Credential Data Via Network Shares

Detects file transfer of sensitive files which contain credential data using network shares.

• Effort: intermediate

• Changelog:

  • 17/10/2023 - minor - Improve selection to reduce false positives

Unsigned Image Loaded Into LSASS Process

Loading unsigned image (DLL, EXE) into LSASS process. To activate this rule you need to monitor loaded images into the LSASS process, this can be done with SYSMON Event ID 7.

• Effort: advanced

WCE wceaux.dll Creation

Detects wceaux.dll creation while Windows Credentials Editor (WCE) is executed.

• Effort: intermediate

Wdigest Enable UseLogonCredential

Detects modification of the Windows Registry value of HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\WDigest\UseLogonCredential. This technique is used to extract passwords in clear-text using WDigest. The rule requires to log for Registry Events, which can be done using Sysmon Event IDs 12, 13 and 14.

• Effort: elementary

• Changelog:

  • 08/08/2024 - major - Rule's pattern field changed and pattern improved to cause less false positives.

Windows Credential Editor Registry Key

Detects the use of Windows Credential Editor (WCE). Prerequisites are logging for Registry events in the Sysmon configuration (events 12 and 13).

• Effort: elementary

Write To File In Sudoers.d Folder

A user tried to write something to a file in /etc/sudoers.d. It can be used to elevate privilege related to sudo and make it persistent. The prerequisites are to enable monitoring of the openat syscall using Auditbeat.

• Effort: advanced

Write To File In Systemd

A user tried to write something to a file in /etc/systemd/system. This repository contains services that are run at start. It can be used to run a malicious programm at start with high privileges. The prerequisites are to enable monitoring of the execve openat using Auditbeat.

• Effort: intermediate

• Changelog:

  • 26/10/2023 - minor - Added filter to reduce false positives.
  • 04/01/2023 - minor - Added filter to reduce false positives.

Network Sniffing

Capture a network trace with netsh.exe

Detects capture a network trace via netsh.exe trace functionality

• Effort: intermediate

Network Sniffing

List of common tools used for network packages sniffing

• Effort: advanced

Network Sniffing Windows

Network sniffing refers to using the network interface on a system to monitor or capture information sent over a wired or wireless connection. An adversary may place a network interface into promiscuous mode to passively access data in transit over the network, or use span ports to capture a larger amount of data.

• Effort: intermediate

WiFi Credentials Harvesting Using Netsh

Detects the harvesting of WiFi credentials using netsh.exe.

• Effort: advanced

• Changelog:

  • 21/11/2023 - minor - Rule's effort level has been changed to advanced as it was highly dependent on the environment.

Brute Force

1Password EPM Brute Force

Detects multiple failed login followed by a success from the same user.

• Effort: master

Anomaly Bruteforce - User Enumeration

The rule detects abnormally high number of TGT failed or NTLM authent failed associate to error code username don't exist who could indicate user enumeration

• Effort: advanced

• Changelog:

  • 09/04/2024 - major - change field on aggregation
  • 13/06/2024 - minor - Adding fields to be displayed in alerts.
  • 12/07/2024 - major - improce coverage, enforce filter and change effort

Anomaly Bruteforce Disabled Users

The rule detects abnormally high number of TGT failed or NTLM authent failed associate to error code account disabled who could indicate a brute force attack

• Effort: advanced

Authentication Impossible Travel

Detects impossible travel when performing authentication from a source IP address, grouped by username.

• Effort: advanced

• Changelog:

  • 27/07/2024 - major - review filter to avoid false positive

Brute Force WALLIX Bastion

Detects a successful login after many failed attempts by the same user.

• Effort: master

Brute-Force On Fortinet Firewall Login

Spots many failed attempts to log on an administration interface.

• Effort: master

Correlation Internal Kerberos Password Spraying

Detect multiple Kerberos authentication failed on several account from one source

• Effort: master

Correlation Internal Ntlm Password Spraying

Detect multiple NTLM authentication failed on several account from one source

• Effort: master

Entra ID Password Compromised By Known Credential Testing Tool

Detects a sign-in that has a correlation ID known to be used by malicious credential testing scripts. Note that even if the sign-in was blocked by MFA (error 50074) or device authentication (error 50097), these verifications only occur after the correct password was submitted. The account's password must still be considered compromised, and be changed.

• Effort: elementary

• Changelog:

  • 05/03/2024 - minor - Rule name error was fixed
  • 09/04/2024 - minor - Error code 500532 added
  • 16/04/2024 - minor - Add more correlation IDs and error code 50052

Fortigate Firewall Login In Failure

Detects failed login attemps on firewall administration rule. Prerequisites, check that the firewall logs format corresponds to the rule

• Effort: master

Fortigate Firewall Successful External Login

Detects succesfull access to administration console of firewall from another IP address than 127.0.0.1. Prerequisites, check that the firewall logs format corresponds to the rule

• Effort: master

FreeRADIUS Failed Authentication

A failed authentication was logged by FreeRADIUS

• Effort: advanced

Google Workspace Login Brute-Force

Detects when a user failed to login multiple times before a successful login.

• Effort: master

Login Brute-Force On Firewall

Detects successful access to administration console of a firewall after several failure.

• Effort: advanced

Login Brute-Force On FreeRadius

A user has attempted to login several times (brute-force) with error then one success.

• Effort: intermediate

Login Brute-Force On Sekoia.io

Detects successful access to Sekoia.io after several failure.

• Effort: intermediate

• Changelog:

  • 22/05/2024 - minor - Switch the group-by clause to a sekoiaio uuid field.

Login Brute-Force Successful

A user has attempted to login several times (brute-force) and succeeded to login.

• Effort: advanced

• Changelog:

  • 06/10/2023 - minor - renaming and tunn filters to limit False Positive

Password Change Brute-Force On AzureAD

A change of password has failed on Azure Active Directory, 5 times for the same user

• Effort: intermediate

Password Reset Error Brute-Force On AzureAD

A reset of password has failed on Azure Active Directory, 5 times within the same entity.

• Effort: intermediate

• Changelog:

  • 22/05/2024 - minor - Switch the group-by clause to a sekoiaio uuid field.

RSA SecurID Failed Authentification

Detects many failed attempts to authenticate followed by a successfull login for a super admin account.

• Effort: advanced

• Changelog:

  • 08/08/2024 - minor - Group-by values were changed to avoid having too much alerts.

Successful Brute Force Login From Internet

Detects a spike of failed login followed by a success one from Internet for a given source and target

• Effort: advanced

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Multi-Factor Authentication Interception

Entra ID Sign-In Via Known AiTM Phishing Kit (Mamba 2FA)

Detects a sign-in attempt with known characteristics of the adversary-in-the-middle phishing kit tracked by Sekoia.io as Mamba 2FA.

• Effort: elementary

• Changelog:

  • 09/08/2024 - major - Update the indicator.
  • 25/09/2024 - major - Rename the rule, update the indicators.

Entra ID Sign-In Via Known AiTM Phishing Kit (Tycoon 2FA)

Detects a sign-in attempt with known characteristics of the adversary-in-the-middle phishing kit Tycoon 2FA.

• Effort: elementary

• Changelog:

  • 01/10/2024 - major - Update the pattern following changes in the phishing kit.

EvilProxy Phishing Domain

Detects subdomains potentially generated by the EvilProxy adversary-in-the-middle phishing platform. Inspect the other subdomains of the domain to identify the landing page, and determine if the user submitted credentials. This rule has a small percentage of false positives on legitimate domains.

• Effort: intermediate

Microsoft 365 Sign-in With No User Agent

Detects a sign-in without any User-Agent header. This may indicate that the sign-in originated from an adversary-in-the-middle phishing page or a password spraying tool. Sign-ins happening through a regular web browser always have a User-Agent header. Investigate the source IP address. If it is unknown, assume that the account's password is compromised.

• Effort: elementary

• Changelog:

  • 04/12/2023 - major - Added Login:login request type with a filter for codes indicating failure

Multiple Authentication On Microsoft 365 (Office 365) Portal From Two IP Addresses

Detection of login events from two IP addresses within 3mn, as it could happen if someone got phished with a tool like Evilginx2.

• Effort: intermediate

Okta MFA Bypass Attempt

A bypass of MFA may have been attempted.

• Effort: intermediate

Potential Azure AD Phishing Page (Adversary-in-the-Middle)

Detects an HTTP request to an URL typical of the Azure AD authentication flow, but towards a domain that is not one the legitimate Microsoft domains used for Azure AD authentication.

• Effort: intermediate

• Changelog:

  • 02/08/2024 - minor - Exclude an additionnal legitimate domain.

Sign-In Via Known AiTM Phishing Kit

Detects a sign-in attempt from an IP address belonging to a known adversary-in-the-middle phishing kit.

• Effort: elementary

• Changelog:

  • 12/12/2024 - minor - Update the selections to use a more appropriate ECS field. The rule now matches on more intakes. The name of the rule has been modified as well.

Forced Authentication

Correlation Suspicious Authentication Coercer Behavior

Detect a possible NTLM Relay attack combine with authent coerce

• Effort: intermediate

Exploitation for Credential Access

Abusing Azure Browser SSO

Detects abusing Azure Browser SSO by requesting OAuth 2.0 refresh tokens for an Azure-AD-authenticated Windows user (i.e. the machine is joined to Azure AD and a user logs in with their Azure AD account) wanting to perform SSO authentication in the browser. An attacker can use this to authenticate to Azure AD in a browser as that user. This technique leverages the COM object (CoCreateInstance), which loads the DLL "C:\Windows\System32\MicrosoftAccountTokenProvider.dll", to get an authentication token. Monitoring the load of this DLL can detect an attacker abusing this technique. More details on this technique are available in the article in the source section. The prerequisite is to log for Loaded DLLs, it can be done using the Sysmon Event ID 7 (DLL image loaded by process).

• Effort: master

Audit CVE Event

Detects events generated by Windows to indicate the exploitation of a known vulnerability.

• Effort: elementary

• Changelog:

  • 15/07/2024 - major - review filter and improve similarity

Steal Application Access Token

Abusing Azure Browser SSO

Detects abusing Azure Browser SSO by requesting OAuth 2.0 refresh tokens for an Azure-AD-authenticated Windows user (i.e. the machine is joined to Azure AD and a user logs in with their Azure AD account) wanting to perform SSO authentication in the browser. An attacker can use this to authenticate to Azure AD in a browser as that user. This technique leverages the COM object (CoCreateInstance), which loads the DLL "C:\Windows\System32\MicrosoftAccountTokenProvider.dll", to get an authentication token. Monitoring the load of this DLL can detect an attacker abusing this technique. More details on this technique are available in the article in the source section. The prerequisite is to log for Loaded DLLs, it can be done using the Sysmon Event ID 7 (DLL image loaded by process).

• Effort: master

Steal Web Session Cookie

Copying Browser Files With Credentials

Detects copy of sensitive data (passwords, cookies, credit cards) included in web browsers files.

• Effort: elementary

Unsecured Credentials

Adexplorer Usage

Detects the usage of Adexplorer, a legitimate tool from the Sysinternals suite that could be abused by attackers as it can saves snapshots of the Active Directory Database.

• Effort: advanced

• Changelog:

  • 27/03/2023 - minor - Modify pattern to avoid false positive and detect usage of either / or - character for snapshot parameter

Container Credential Access

Adversaries could abuse containers tools to obtain credential like Kubernetes secret or Kubernetes service account access token

• Effort: intermediate

Credentials Extraction

This rule aims to detect the use of a specific command to access some credentials without using mimikatz or another tool.

• Effort: advanced

Google Cloud Audit Logs 2FA Disabled

Detects when Google Cloud Audit Logs notify the 2FA deactivation for a user account.

• Effort: intermediate

Linux Suspicious Search

Adversaries may search for private key on compromised systems

• Effort: intermediate

Opening Of a Password File

Command line detection of common office software opening some password related file. It could be a security breach if an unauthorized user access it.

• Effort: master

• Changelog:

  • 07/10/2024 - minor - Modified similarity strategy.
  • 21/03/2024 - minor - Adding similarity strategy to reduce alerts creation.
  • 22/01/2024 - minor - Removing a file extension to allow broader detection.
  • 16/11/2023 - minor - Changing effort level and adding filter to reduce false positives.
  • 03/07/2023 - minor - Added french words for the command lines.
  • 22/08/2023 - major - adding similarity strategy in order to avoid multiple alerts creation

Outlook Registry Access

Detection of accesses to Microsoft Outlook registry hive, which might contain sensitive information.

• Effort: master

• Changelog:

  • 02/04/2024 - major - Updating the pattern and adding filter selection
  • 19/02/2024 - minor - Effort level was adapted according to the observed hits for the rule

Remote Registry Management Using Reg Utility

Remote registry management using REG utility from non-admin workstation. This requires Windows Security events logging.

• Effort: master

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

XCopy Suspicious Usage

Detects the usage of xcopy with suspicious command line options (used by Judgment Panda APT in the past). The rule is based on command line only in case xcopy is renamed.

• Effort: advanced

Credentials from Password Stores

1Password EPM Grant Access Vault

Detects when a group is granted access to a 1Password vault.

• Effort: master

Anomaly Secret Store Access

The rule detects abnormally high access to secrets store folder

• Effort: master

• Changelog:

  • 08/04/2024 - minor - change field name on query
  • 12/06/2024 - minor - Adding new fields to be displayed in alerts.

Credential Harvesting Via Vaultcmd.exe

Detects when the process vaultcmd is used for credential harvesting.

• Effort: advanced

Credentials Extraction

This rule aims to detect the use of a specific command to access some credentials without using mimikatz or another tool.

• Effort: advanced

Information Stealer Downloading Legitimate Third-Party DLLs

Detects operations that involved legitimate third-party DLLs used by information-stealing malware for data collection on the infected host. This detection rule correlates at least 7 events including the following DLLs - freebl3.dll, vcruntime140.dll, msvcp140.dll, nss3.dll, sqlite3.dll, softokn3.dll, mozglue.dll and libcurl.dll. This behaviour matches activities of several widespread stealer like Vidar, Raccoon Stealer v2, Mars Stealer, etc.

• Effort: intermediate

PasswordDump SecurityXploded Tool

Detects the execution of the PasswordDump SecurityXploded Tool

• Effort: elementary

Modify Authentication Process

1Password EPM MFA Disable

Detects when the MFA for 1Password is disabled.

• Effort: master

Active Directory Shadow Credentials

Detects alternative credentials material adding. Attackers can abuse msDS-KeyCredentialLink and create a key pair to obtain a persistent and stealthy access to the target user or computer.

• Effort: elementary

Google Workspace MFA changed

Detects when the settings for the MFA are modified.

• Effort: master

Google Workspace Password Change

Detects when a password is changed. An attacker can perform this action to impact the availability of the account.

• Effort: master

• Changelog:

  • 20/06/2024 - minor - Adding new element to increase detection.

KeePass Config XML In Command-Line

Detects a command-line interaction with the KeePass Config XML file. It could be used to retrieve informations or to be abused for persistence.

• Effort: intermediate

Microsoft Entra ID (Azure AD) MFA Method Change

This rule detects when an user makes a change to the multifactor authentication methods for their account. In environments where this rule is too noisy, alert filters should be applied, e.g. to focus on privileged accounts, or unusual source network locations.

• Effort: master

Adversary-in-the-Middle

Correlation Suspicious Authentication Coercer Behavior

Detect a possible NTLM Relay attack combine with authent coerce

• Effort: intermediate

Entra ID Sign-In Via Known AiTM Phishing Kit (Mamba 2FA)

Detects a sign-in attempt with known characteristics of the adversary-in-the-middle phishing kit tracked by Sekoia.io as Mamba 2FA.

• Effort: elementary

• Changelog:

  • 09/08/2024 - major - Update the indicator.
  • 25/09/2024 - major - Rename the rule, update the indicators.

Entra ID Sign-In Via Known AiTM Phishing Kit (Tycoon 2FA)

Detects a sign-in attempt with known characteristics of the adversary-in-the-middle phishing kit Tycoon 2FA.

• Effort: elementary

• Changelog:

  • 01/10/2024 - major - Update the pattern following changes in the phishing kit.

EvilProxy Phishing Domain

Detects subdomains potentially generated by the EvilProxy adversary-in-the-middle phishing platform. Inspect the other subdomains of the domain to identify the landing page, and determine if the user submitted credentials. This rule has a small percentage of false positives on legitimate domains.

• Effort: intermediate

Microsoft 365 Sign-in With No User Agent

Detects a sign-in without any User-Agent header. This may indicate that the sign-in originated from an adversary-in-the-middle phishing page or a password spraying tool. Sign-ins happening through a regular web browser always have a User-Agent header. Investigate the source IP address. If it is unknown, assume that the account's password is compromised.

• Effort: elementary

• Changelog:

  • 04/12/2023 - major - Added Login:login request type with a filter for codes indicating failure

Multiple Authentication On Microsoft 365 (Office 365) Portal From Two IP Addresses

Detection of login events from two IP addresses within 3mn, as it could happen if someone got phished with a tool like Evilginx2.

• Effort: intermediate

Possible RottenPotato Attack

Detects logon events that have characteristics of events generated during an attack leveraging RottenPotato.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Potential Azure AD Phishing Page (Adversary-in-the-Middle)

Detects an HTTP request to an URL typical of the Azure AD authentication flow, but towards a domain that is not one the legitimate Microsoft domains used for Azure AD authentication.

• Effort: intermediate

• Changelog:

  • 02/08/2024 - minor - Exclude an additionnal legitimate domain.

Sign-In Via Known AiTM Phishing Kit

Detects a sign-in attempt from an IP address belonging to a known adversary-in-the-middle phishing kit.

• Effort: elementary

• Changelog:

  • 12/12/2024 - minor - Update the selections to use a more appropriate ECS field. The rule now matches on more intakes. The name of the rule has been modified as well.

Steal or Forge Kerberos Tickets

Kerberos Pre-Auth Disabled in UAC

The rule identify a change performed on a domain user object that disables Kerberos Pre-Authentication

• Effort: elementary

Possible Replay Attack

This event can be a sign of Kerberos replay attack or, among other things, network device configuration or routing problems.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Rubeus Register New Logon Process

Detects potential use of Rubeus through registering a new logon process. This rule needs the EventID 4611, which can be configured through Group Policies (Audit Security System Extension)

• Effort: master

Rubeus Tool Command-line

Detects command line parameters used by Rubeus, a toolset to interact with Kerberos and abuse it.

• Effort: advanced

Suspicious Kerberos Ticket

Detect suspicious Kerberos ticket based on on their parameters which suggest that it could be forged.

• Effort: intermediate

• Changelog:

  • 03/07/2024 - major - Add filter to cover a second case to improve rule coverage

Suspicious Outbound Kerberos Connection

Detects suspicious outbound network activity via kerberos default port indicating possible lateral movement or first stage PrivEsc via delegation.

• Effort: advanced

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed
  • 05/08/2024 - major - Rule reworked to match more intakes and have less false positives (filters were added).

Suspicious TGS requests (Kerberoasting)

The rule aims at detecting the Kerberoasting technique, when an attacker requests TGS in order to crack them offline. Toease its task, the attacker requests tickets with weak encryption (such as RC4_HMAC_MD5). The rule therefore detects when an user is requesting 5 TGS for different users in 5 minutes.

• Effort: advanced

User Couldn't Call A Privileged Service LsaRegisterLogonProcess

The LsaRegisterLogonProcess function verifies that the application making the function call is a logon process by checking that it has the SeTcbPrivilege privilege set. Possible Rubeus tries to get a handle to LSA. This rule requires to log the Event ID 4673, which can be done by updating the Audit Policy.

• Effort: master

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Steal or Forge Authentication Certificates

Suspicious Certificate Request-adcs Abuse

Detects when a new certificate is requested or granted against Active Directory Certificate Services (AD CS) using a Subject Alternative Name (SAN)

• Effort: elementary

Suspicious Kerberos Ticket

Detect suspicious Kerberos ticket based on on their parameters which suggest that it could be forged.

• Effort: intermediate

• Changelog:

  • 03/07/2024 - major - Add filter to cover a second case to improve rule coverage

Discovery

System Service Discovery

Anomaly Internal RDP

Detects uncompleted attempts to connect to a Remote Desktop Protocol (RDP) session.

• Effort: master

PowerView commandlets 1

Detects PowerView commandlets which perform network and Windows domain enumeration and exploitation. It provides replaces for almost all Windows net commands, letting you query users, machines, domain controllers, user descriptions, share, sessions, and more.

• Effort: advanced

PowerView commandlets 2

Detects PowerView commandlets which perform network and Windows domain enumeration and exploitation. It provides replaces for almost all Windows net commands, letting you query users, machines, domain controllers, user descriptions, share, sessions, and more.

• Effort: advanced

• Changelog:

  • 04/10/2023 - major - Removed an option from the ScriptBlockText selection to reduce false positives.
  • 26/03/2024 - major - Rule's pattern field changed

SCM Database Handle Failure

Detects non-system users failing to get a handle of the SCM database.

• Effort: master

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

SCM Database Privileged Operation

Detects non-system users performing privileged operation on the SCM database

• Effort: master

Query Registry

Putty Sessions Listing

Detects attempts to list Putty sessions through registry. To fully work, this rule requires to log registry accesses, which can be done with the Windows Event ID 4656 or 4663 but for that specific configuration is needed.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Remote Registry Management Using Reg Utility

Remote registry management using REG utility from non-admin workstation. This requires Windows Security events logging.

• Effort: master

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Suspicious Taskkill Command

Detects rare taskkill command being used. It could be related to Baby Shark malware.

• Effort: intermediate

SysKey Registry Keys Access

Detects handle requests and access operations to specific registry keys to calculate the SysKey. The SysKey allows to decrypt Security Account Mannager (SAM) database entries (from registry or hive) and get NTLM, and sometimes LM hashes of local accounts passwords. Adversaries can calculate the Syskey by using RegOpenKeyEx/RegQueryInfoKey API calls to query the appropriate class info and values from the HKLM:\SYSTEM\CurrentControlSet\Control\Lsa\JD, HKLM:\SYSTEM\CurrentControlSet\Control\Lsa\Skew1, HKLM:\SYSTEM\CurrentControlSet\Control\Lsa\GBG, and HKLM:\SYSTEM\CurrentControlSet\Control\Lsa\Data keys.

• Effort: elementary

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

System Network Configuration Discovery

Discovery Commands Correlation

Detects some frequent discovery commands used by some ransomware operators.

• Effort: intermediate

• Changelog:

  • 16/04/2024 - minor - Adding new elements to increase detection.

Reconnaissance Commands Activities

Based on Cynet, Microsoft and Kaspersky analysis of Qakbot, this rule tries to detect some discovery TTPs.

• Effort: intermediate

Suspicious Headless Web Browser Execution To Download File

Detects a suspicious command used to execute a Chromium-based web browser (Chrome or Edge) using the headless mode, meaning that the browser window wouldn't be visible, and the dump mode to download a file. This technique can be used to fingerprint the compromised host, in particular by the Ducktail infostealer.

• Effort: elementary

Remote System Discovery

Anomaly Internal Ping

Detects internal ping with uncomplete connection on internal network.

• Effort: master

Network Scanning and Discovery

Tools and command lines used for network discovery from current system

• Effort: advanced

Openfiles Usage

Detects when the command openfiles, to get information on files opened remotely, is used.

• Effort: advanced

PowerView commandlets 1

Detects PowerView commandlets which perform network and Windows domain enumeration and exploitation. It provides replaces for almost all Windows net commands, letting you query users, machines, domain controllers, user descriptions, share, sessions, and more.

• Effort: advanced

PowerView commandlets 2

Detects PowerView commandlets which perform network and Windows domain enumeration and exploitation. It provides replaces for almost all Windows net commands, letting you query users, machines, domain controllers, user descriptions, share, sessions, and more.

• Effort: advanced

• Changelog:

  • 04/10/2023 - major - Removed an option from the ScriptBlockText selection to reduce false positives.
  • 26/03/2024 - major - Rule's pattern field changed

Shell PID Injection

Detects when shells PID are listed and injected in another process. It can be performed to reuse sudo token related to shell in order to elevate privilege and maintain persistence.

• Effort: intermediate

System Owner/User Discovery

RDP Session Discovery

Detects use of RDP session discovery via qwinsta or quser. Used by some threat actors to know if someone is working via RDP on a server.

• Effort: advanced

Network Sniffing

Capture a network trace with netsh.exe

Detects capture a network trace via netsh.exe trace functionality

• Effort: intermediate

Network Sniffing

List of common tools used for network packages sniffing

• Effort: advanced

Network Sniffing Windows

Network sniffing refers to using the network interface on a system to monitor or capture information sent over a wired or wireless connection. An adversary may place a network interface into promiscuous mode to passively access data in transit over the network, or use span ports to capture a larger amount of data.

• Effort: intermediate

WiFi Credentials Harvesting Using Netsh

Detects the harvesting of WiFi credentials using netsh.exe.

• Effort: advanced

• Changelog:

  • 21/11/2023 - minor - Rule's effort level has been changed to advanced as it was highly dependent on the environment.

Network Service Discovery

Advanced IP Scanner

Detects the use of Advanced IP Scanner. Seems to be a popular tool for ransomware groups.

• Effort: master

Anomaly Internal Port Connection

Detects multiple scan of different ports on internal network.

• Effort: master

• Changelog:

  • 12/06/2024 - minor - Adding field to be displayed in the alerts and changing the query.
  • 04/07/2024 - minor - Reviewing query.

Anomaly Multiple Host Port Scan

Detects multiple port scan from/to a private address, excluding DNS.

• Effort: master

• Changelog:

  • 11/06/2024 - minor - Adding fields to be displayed in the alert and changing effort level.

System Network Connections Discovery

Broadcom Edge Secure Web Gateway Anomaly TCP Denied

Detects a high number of connection TCP denied.

• Effort: master

Cmd.exe Used To Run Reconnaissance Commands

Detects command lines with suspicious args

• Effort: advanced

Discovery Commands Correlation

Detects some frequent discovery commands used by some ransomware operators.

• Effort: intermediate

• Changelog:

  • 16/04/2024 - minor - Adding new elements to increase detection.

Reconnaissance Commands Activities

Based on Cynet, Microsoft and Kaspersky analysis of Qakbot, this rule tries to detect some discovery TTPs.

• Effort: intermediate

Permission Groups Discovery

Bloodhound and Sharphound Tools Usage

Detects default process names and default command line parameters used by Bloodhound and Sharphound tools.

• Effort: intermediate

• Changelog:

  • 11/12/2024 - minor - Added a default similarity based on host name and user name to avoid too many alerts.
  • 26/03/2024 - minor - Adapted the rule to remove false positives.

Domain Group And Permission Enumeration

Detects adversaries attempts to find domain-level groups and permission settings. Commands such as net group /domain of the Net utility can list domain-level groups The knowledge of domain-level permission groups can help adversaries determine which groups exist and which users belong to a particular group. Adversaries may use this information to determine which users have elevated permissions, such as domain administrators. Wizard Spider, FIN6, and other groups used net in their campaigns.

• Effort: advanced

Gpresult Usage

Detects when an account uses gpresult to get information on gpo.

• Effort: advanced

Permission Discovery Via Wmic

Detects discovery of permission on local groups via the tool wmic.

• Effort: advanced

System Information Discovery

Discovery Commands Correlation

Detects some frequent discovery commands used by some ransomware operators.

• Effort: intermediate

• Changelog:

  • 16/04/2024 - minor - Adding new elements to increase detection.

Listing Systemd Environment

Detects a listing of systemd environment variables. This command could be used to do reconnaissance on a compromised host.

• Effort: advanced

• Changelog:

  • 06/03/2024 - minor - Effort level was adapted according to the observed hits for the rule

Shadow Copies

Detects command line used to create and list shadow copies. An adversary may attempt to get information on shadow volumes to perform deletion or extract password hashes from the ntds.dit file. This rule requires command line logging or Windows PowerShell events (4104).

• Effort: master

• Changelog:

  • 11/07/2024 - minor - Adding new elements to detect and adding filter to reduce false positives.

Suspicious Headless Web Browser Execution To Download File

Detects a suspicious command used to execute a Chromium-based web browser (Chrome or Edge) using the headless mode, meaning that the browser window wouldn't be visible, and the dump mode to download a file. This technique can be used to fingerprint the compromised host, in particular by the Ducktail infostealer.

• Effort: elementary

System Info Discovery

System info discovery, attempt to detects basic command use to fingerprint a host.

• Effort: master

WMI Fingerprint Commands

Detects attacker fingerprint activities based on the correlation of specific WMIC commands. This has been observed with Aurora malware.

• Effort: intermediate

File and Directory Discovery

Netskope DLP Alert

Detects DLP alerts which are not allowed.

• Effort: master

• Changelog:

  • 28/03/2024 - minor - Rule effort was updated to master

Account Discovery

AD Privileged Users Or Groups Reconnaissance

Detect privileged users or groups reconnaissance based on 4661 Event ID and known privileged users or groups SIDs. If the user account name is not a known admin it is suspicious.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

AD User Enumeration

Detects access to a domain user from a non-machine account. This requires Windows Security Event ID 4662 and could be triggered by some administrators configuring new users.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Active Directory Data Export Using Csvde

Detects the use of Csvde, a command-line tool from Windows Server that can be used to export Active Directory data to CSV files. This export doesn't include password hashes, but can be used as a discovery tool to enumerate users, machines and group memberships.

• Effort: elementary

Bloodhound and Sharphound Tools Usage

Detects default process names and default command line parameters used by Bloodhound and Sharphound tools.

• Effort: intermediate

• Changelog:

  • 11/12/2024 - minor - Added a default similarity based on host name and user name to avoid too many alerts.
  • 26/03/2024 - minor - Adapted the rule to remove false positives.

Discovery Commands Correlation

Detects some frequent discovery commands used by some ransomware operators.

• Effort: intermediate

• Changelog:

  • 16/04/2024 - minor - Adding new elements to increase detection.

Phosphorus (APT35) Exchange Discovery

According to the Miscosoft's report, the group Phosphorus (part of APT35) uses a specific PowerShell command to collect information about its the environment of compromised Microsoft Exchange servers. The command is the following: Get-Recipient | Select Name -ExpandProperty EmailAddresses -first 1 | Select SmtpAddress | ft -hidetableheaders

• Effort: elementary

PowerView commandlets 1

Detects PowerView commandlets which perform network and Windows domain enumeration and exploitation. It provides replaces for almost all Windows net commands, letting you query users, machines, domain controllers, user descriptions, share, sessions, and more.

• Effort: advanced

PowerView commandlets 2

Detects PowerView commandlets which perform network and Windows domain enumeration and exploitation. It provides replaces for almost all Windows net commands, letting you query users, machines, domain controllers, user descriptions, share, sessions, and more.

• Effort: advanced

• Changelog:

  • 04/10/2023 - major - Removed an option from the ScriptBlockText selection to reduce false positives.
  • 26/03/2024 - major - Rule's pattern field changed

Reconnaissance Commands Activities

Based on Cynet, Microsoft and Kaspersky analysis of Qakbot, this rule tries to detect some discovery TTPs.

• Effort: intermediate

Remote Enumeration Of Lateral Movement Groups

Detects remote session lists the member of four local groups relevant to lateral movement. This behavior is common in Active Directory mapping tools such as SharpHound.

• Effort: intermediate

Remote Privileged Group Enumeration

Detects remote listing of local privileged group. Potential false positives, which should justify alert filters, are service accounts and administrators doing maintenance.

• Effort: advanced

• Changelog:

  • 18/04/2023 - minor - Exclude events from the Local System session that cause false positives.
  • 04/04/2024 - major - Rule's pattern field changed

Shell PID Injection

Detects when shells PID are listed and injected in another process. It can be performed to reuse sudo token related to shell in order to elevate privilege and maintain persistence.

• Effort: intermediate

Network Share Discovery

Netscan Share Access Artefact

Detects netscan artefact on windows network share - indicate network share discovery.

• Effort: intermediate

Network Share Discovery

Adversaries may look for folders and drives shared on remote systems as a means of identifying sources of information to gather as a precursor for Collection and to identify potential systems of interest for Lateral Movement. Networks often contain shared network drives and folders that enable users to access file directories on various systems across a network. File sharing over a Windows network occurs over the SMB protocol. This technique is frequently leveraged by threat actors such as APT32, APT41, Wizard Spider. But also, through the use of some malware such as Cobalt Strike, Empire, PlugX and Ramsay.

• Effort: master

PowerView commandlets 1

Detects PowerView commandlets which perform network and Windows domain enumeration and exploitation. It provides replaces for almost all Windows net commands, letting you query users, machines, domain controllers, user descriptions, share, sessions, and more.

• Effort: advanced

PowerView commandlets 2

Detects PowerView commandlets which perform network and Windows domain enumeration and exploitation. It provides replaces for almost all Windows net commands, letting you query users, machines, domain controllers, user descriptions, share, sessions, and more.

• Effort: advanced

• Changelog:

  • 04/10/2023 - major - Removed an option from the ScriptBlockText selection to reduce false positives.
  • 26/03/2024 - major - Rule's pattern field changed

Domain Trust Discovery

AdFind Usage

Detects the usage of the AdFind tool. AdFind.exe is a free tool that extracts information from Active Directory. Wizard Spider (Bazar, TrickBot, Ryuk), FIN6 and MAZE operators have used AdFind.exe to collect information about Active Directory organizational units and trust objects

• Effort: elementary

• Changelog:

  • 12/10/2023 - minor - Slight change to a condition in order to reduce false positives.

Bloodhound and Sharphound Tools Usage

Detects default process names and default command line parameters used by Bloodhound and Sharphound tools.

• Effort: intermediate

• Changelog:

  • 11/12/2024 - minor - Added a default similarity based on host name and user name to avoid too many alerts.
  • 26/03/2024 - minor - Adapted the rule to remove false positives.

Domain Trust Discovery Through LDAP

Detects attempts to gather information on domain trust relationships that may be used to identify lateral movement opportunities. "trustedDomain" which is detected here is a Microsoft Active Directory ObjectClass Type that represents a domain that is trusted by, or trusting, the local AD DOMAIN. Several tools are using LDAP queries in the end to get the information (DSQuery, sometimes ADFind as well, etc.)

• Effort: elementary

• Changelog:

  • 19/10/2023 - minor - improve filter to reduce false positives

NlTest Usage

Detects attempts to gather information on domain trust relationships that may be used to identify lateral movement opportunities. These command lines were observed in numerous attacks, but also sometimes from legitimate administrators for debugging purposes. The rule does not cover very basics commands but rather the ones that are interesting for attackers to gather information on a domain.

• Effort: advanced

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.
  • 10/10/2024 - minor - Adding new elements and filters to increase detection and reduce false positives.

Phosphorus Domain Controller Discovery

According to the Miscosoft's report, the group Phosphorus (part of APT35) uses a specific PowerShell command to collect information about the Domain Controller. The command is the following: "powershell.exe" /c Get-WMIObject Win32_NTDomain | findstr DomainController

• Effort: intermediate

PowerView commandlets 1

Detects PowerView commandlets which perform network and Windows domain enumeration and exploitation. It provides replaces for almost all Windows net commands, letting you query users, machines, domain controllers, user descriptions, share, sessions, and more.

• Effort: advanced

PowerView commandlets 2

Detects PowerView commandlets which perform network and Windows domain enumeration and exploitation. It provides replaces for almost all Windows net commands, letting you query users, machines, domain controllers, user descriptions, share, sessions, and more.

• Effort: advanced

• Changelog:

  • 04/10/2023 - major - Removed an option from the ScriptBlockText selection to reduce false positives.
  • 26/03/2024 - major - Rule's pattern field changed

Trickbot Malware Activity

Detects Trickbot malware process tree pattern in which rundll32.exe is parent of wermgr.exe.

• Effort: intermediate

Software Discovery

WMIC Command To Determine The Antivirus

Detects WMIC command to determine the antivirus on a system, characteristic of the ZLoader malware (and possibly others)

• Effort: advanced

• Changelog:

  • 28/02/2024 - minor - Adding a new usage of wmic.

Cloud Service Discovery

AWS Suspicious Discovery Commands

Attackers often use discovery commands such as DescribeInstances or DescribeSecurityGroups, and many others, to find how an AWS tenant is configured.

• Effort: master

AzureEdge in Command Line

Detects use of azureedge in the command line.

• Effort: advanced

Cloud Infrastructure Discovery

AWS Suspicious Discovery Commands

Attackers often use discovery commands such as DescribeInstances or DescribeSecurityGroups, and many others, to find how an AWS tenant is configured.

• Effort: master

System Location Discovery

Language Discovery

Detects when a user makes a query on the language of the system.

• Effort: advanced

Cloud Storage Object Discovery

AWS Suspicious Discovery Commands

Attackers often use discovery commands such as DescribeInstances or DescribeSecurityGroups, and many others, to find how an AWS tenant is configured.

• Effort: master

Lateral Movement

Remote Services

AWS CloudTrail EC2 CreateKeyPair

Detects when a key pair is created. Usually, SendSSHPublicKey is used afterwards to push the created key to an EC2 instance in order to be able to establish a connection to that instance.

• Effort: advanced

AWS CloudTrail EC2 DeleteKeyPair

Detects when a specific key pair is deleted. This means the public key was removed from EC2.

• Effort: advanced

AWS CloudTrail EC2 Enable Serial Console Access

Detects when the EC2 serial console access feature is enabled. This could abused by some attackers to avoid network detection when accessing to EC2 instances.

• Effort: intermediate

AWS CloudTrail EC2 Instance Connect SendSSHPublicKey

Detects when an attacker is pushing an SSH Public Key to an EC2 instance. Then he can establish a connection to the console using SSH.

• Effort: advanced

AWS CloudTrail EC2 Instance Connect SendSerialConsoleSSHPublicKey

Detects when an attacker is pushing an SSH Public Key to an EC2 instance. Then he can establish a serial connection to the console using SSH.

• Effort: advanced

Admin Share Access

Detects access to $ADMIN share. The advanced audit policy setting "Object Access > Audit File Share" must be configured for Success/Failure. Also be very cautious to previously check if this is not commonly used by your administrators as to remotely manage your computers.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Cobalt Strike Default Service Creation Usage

Detects Cobalt Strike usage from an existing beacon when attacker tries to elevate or move laterally through a service creation.

• Effort: elementary

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Correlation Impacket Smbexec

This rule detects the execution of smbexec via the relevant share pattern name

• Effort: elementary

Denied Access To Remote Desktop

Detects when an authenticated user who is not allowed to log on remotely attempts to connect to this computer through Remote Desktop. This event can be generated by attackers when searching for available windows servers in the network. This rule detects only users from external network.

• Effort: intermediate

• Changelog:

  • 19/10/2023 - minor - Minor change in selection to reduce false positives.
  • 26/03/2024 - major - Rule's pattern field changed

Lateral Movement Remote Named Pipe

Detects lateral movement and remote exec using named pipe over network. This requires Windows Security event logging with the File Share enable policy.

• Effort: advanced

• Changelog:

  • 12/06/2024 - minor - Fix filter selection
  • 03/04/2024 - major - Rule's pattern field changed
  • 26/03/2024 - minor - Filter was improved to reduce false positives

Lsass Access Through WinRM

Detects the access of LSASS.exe process through Windows Remote Management (WinRM) protocol. This is often done using Invoke-Mimikatz -ComputerName command, which uses PSRemoting and therefore WinRM. However, this is not limited to the Mimikatz threat and can be done by other tools as well. This rule needs Process Access monitoring, which can be done using Sysmon's event ID 10.

• Effort: intermediate

MMC Spawning Windows Shell

Detects a Windows command line executable started from MMC process

• Effort: intermediate

MMC20 Lateral Movement

Detects MMC20.Application Lateral Movement; specifically looks for the spawning of the parent MMC.exe with a command line of "-Embedding" as a child of svchost.exe.

• Effort: intermediate

Protected Storage Service Access

Detects access to a protected_storage service over the network. It could identify potential abuse of DPAPI to extract domain backup keys from Domain Controllers.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

RDP Login From Localhost

Detects RDP login from localhost source address, which may be a tunnelled login to bypass network restrictions.

• Effort: advanced

• Changelog:

  • 24/11/2023 - minor - Effort level changed to advanced.
  • 04/04/2024 - major - Rule's pattern field changed

RDP Port Change Using Powershell

Detects RDP port configuration change using a PowerShell command such as 'Set-ItemProperty -Path "HKLM:\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" -Name PortNumber -Value XXX Restart-Service termservice -force'. Threat actors can change RDP to another port to bypass protections, avoid detection based on the port, or to take full control of the system.

• Effort: intermediate

Remote Service Activity Via SVCCTL Named Pipe

Detects remote service activity via remote access to the svcctl named pipe

• Effort: master

• Changelog:

  • 21/03/2024 - minor - change filter to ACL hex value and adapt effort
  • 04/04/2024 - major - Rule's pattern field changed

Smbexec.py Service Installation

Detects the use of smbexec.py tool by detecting a specific service installation

• Effort: elementary

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Replication Through Removable Media

External Disk Drive Or USB Storage Device

Detects external diskdrives or plugged in USB device.

• Effort: advanced

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Exploitation of Remote Services

Audit CVE Event

Detects events generated by Windows to indicate the exploitation of a known vulnerability.

• Effort: elementary

• Changelog:

  • 15/07/2024 - major - review filter and improve similarity

CVE-2019-0708 Scan

Detects the use of a scanner that discovers targets vulnerable to CVE-2019-0708 RDP RCE aka BlueKeep.

• Effort: elementary

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

ESET Protect Remote Action

Detects when different remote commands are performed on the same hostname is a short amount of time.

• Effort: master

Registry Checked For Lanmanserver DisableCompression Parameter

Detects registry access for Lanmanserver\Parameters. The check of the value DisableCompression could be a sign of an attack trying to exploit SMBGhost vulnerability (CVE-2020-0796).

• Effort: master

Use Alternate Authentication Material

Abusing Azure Browser SSO

Detects abusing Azure Browser SSO by requesting OAuth 2.0 refresh tokens for an Azure-AD-authenticated Windows user (i.e. the machine is joined to Azure AD and a user logs in with their Azure AD account) wanting to perform SSO authentication in the browser. An attacker can use this to authenticate to Azure AD in a browser as that user. This technique leverages the COM object (CoCreateInstance), which loads the DLL "C:\Windows\System32\MicrosoftAccountTokenProvider.dll", to get an authentication token. Monitoring the load of this DLL can detect an attacker abusing this technique. More details on this technique are available in the article in the source section. The prerequisite is to log for Loaded DLLs, it can be done using the Sysmon Event ID 7 (DLL image loaded by process).

• Effort: master

Potential RDP Connection To Non-Domain Host

Detects logons using NTLM to hosts that are potentially not part of the domain using RDP (TermSrv). Event ID 8001 corresponds to outgoing NTLM authentication traffic and TermSrv stands for RDP Terminal Services Server. Check if the contacted host is legitimate. To use this detection rule, enable logging of outbound NTLM authentications on all domain controllers, using the following Group Policy (GPO) - Computer Configuration > Policies > Windows Settings > Security Settings > Local Policies > Security Options > Network security: Restrict NTLM: Outgoing NTLM traffic to remote servers -> Define this policy setting: Audit all.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Rubeus Tool Command-line

Detects command line parameters used by Rubeus, a toolset to interact with Kerberos and abuse it.

• Effort: advanced

Successful Overpass The Hash Attempt

Detects successful logon with logon type 9 (NewCredentials) which matches the Overpass the Hash behavior of e.g Mimikatz's sekurlsa::pth module.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Collection

Data from Local System

AWS CloudTrail EC2 VM Export Failure

Detects attempt to export an AWS EC2 instance. A VM Export might indicate an attempt to extract information from an instance.

• Effort: intermediate

Formbook File Creation DB1

Detects specific file creation (Users*\AppData\Local\Temp\DB1) to store data to exfiltrate (Formbook behavior). Logging for Sysmon event 11 is usually used for this detection.

• Effort: intermediate

Information Stealer Downloading Legitimate Third-Party DLLs

Detects operations that involved legitimate third-party DLLs used by information-stealing malware for data collection on the infected host. This detection rule correlates at least 7 events including the following DLLs - freebl3.dll, vcruntime140.dll, msvcp140.dll, nss3.dll, sqlite3.dll, softokn3.dll, mozglue.dll and libcurl.dll. This behaviour matches activities of several widespread stealer like Vidar, Raccoon Stealer v2, Mars Stealer, etc.

• Effort: intermediate

Microsoft Exchange PowerShell Snap-Ins To Export Exchange Mailbox Data

Detects PowerShell SnapIn command line or PowerShell script, often used with Get-Mailbox to export Exchange mailbox data.

• Effort: intermediate

• Changelog:

  • 13/08/2024 - minor - Added filter to reduce false positives

Ntfsinfo Usage

Detects when the command ntfsinfo is used. An attacker can access to information on the volume from NTFS and have a directory dump of NTFS files.

• Effort: advanced

Data from Network Shared Drive

RDP Configuration File From Mail Process

Detects RDP configuration file being created or executed by a Mail-related process like Outlook. RDP configuration file will allow, when opened, an user to connect to the configured server easily. Attackers use this to trick victims in order to get a shared drive and potentially retrieve the data from that drive, but also drop a malicious file on the drive to establish persistence. Using RDP can also expose the victim's credential and clipboard data on some cases.

• Effort: advanced

Suspicious Access To Sensitive File Extensions

Detects known sensitive file extensions accessed on a network share. This activity could possibly correspond to a malicious one (removing backup, reading sensitive files, etc.).

• Effort: master

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Suspicious Email Attachment Received

Detects email containing a suspicious file as an attachment, based on its extension.

• Effort: advanced

• Changelog:

  • 15/04/2024 - minor - Update email from field to latest parser format
  • 14/11/2024 - major - Adding new file extension and new condition to make the rule broader as it can now match on more intakes.

Data Staged

CVE-2021-20023 SonicWall Arbitrary File Read

Detects Arbitrary File Read, which can be used with other vulnerabilities as a mean to obtain outputs generated by attackers, or sensitive data.

• Effort: advanced

Email Collection

Entra ID Consent Attempt to Suspicious OAuth Application

Detects an attempt to authorize account access to an OAuth application commonly used in business email compromise (BEC) attacks. Investigate the source IP address: unusual countries, RDP hosts and VPN providers are likely indicators of malicious activity.

• Effort: elementary

Exchange Mailbox Export

Detection of a standard Exchange Mailbox export, which stores all mails from a user in a pst file, from command line or PowerShell script.

• Effort: intermediate

Google Cloud Audit Logs Custom Gmail Route

Detects when a custom Gmail route is added or modified. This could be abused by attackers to exfiltrate data.

• Effort: advanced

Google Cloud Audit Logs Email Forwarding

Detects when an out of domain email forwarding is enabled on Google Cloud.

• Effort: advanced

Google Workspace Email Forwarding

Detects when a user enables email forwarding out of the domain

• Effort: advanced

Microsoft 365 Email Forwarding To Consumer Email Address

An email forwarding rule was created, that automatically forwards incoming emails to an address outside of the organization (most common consumer email services).

• Effort: intermediate

• Changelog:

  • 22/04/2024 - minor - Add zohomail.com

Microsoft 365 Email Forwarding To Email Address With Rare TLD

An email forwarding rule was created, that automatically forwards incoming emails to an address outside of the organization (less common top-level domain).

• Effort: intermediate

Microsoft 365 Email Forwarding To Privacy Email Address

An email forwarding rule was created, that automatically forwards incoming emails to an address outside of the organization (most common privacy email services).

• Effort: elementary

Outlook Registry Access

Detection of accesses to Microsoft Outlook registry hive, which might contain sensitive information.

• Effort: master

• Changelog:

  • 02/04/2024 - major - Updating the pattern and adding filter selection
  • 19/02/2024 - minor - Effort level was adapted according to the observed hits for the rule

Audio Capture

Audio Capture via PowerShell

Detects audio capture via PowerShell Cmdlet

• Effort: intermediate

• Changelog:

  • 18/04/2023 - minor - Use more specific patterns to fix false positives.

Data from Cloud Storage

Netskope DLP Alert

Detects DLP alerts which are not allowed.

• Effort: master

• Changelog:

  • 28/03/2024 - minor - Rule effort was updated to master

Adversary-in-the-Middle

Correlation Suspicious Authentication Coercer Behavior

Detect a possible NTLM Relay attack combine with authent coerce

• Effort: intermediate

Entra ID Sign-In Via Known AiTM Phishing Kit (Mamba 2FA)

Detects a sign-in attempt with known characteristics of the adversary-in-the-middle phishing kit tracked by Sekoia.io as Mamba 2FA.

• Effort: elementary

• Changelog:

  • 09/08/2024 - major - Update the indicator.
  • 25/09/2024 - major - Rename the rule, update the indicators.

Entra ID Sign-In Via Known AiTM Phishing Kit (Tycoon 2FA)

Detects a sign-in attempt with known characteristics of the adversary-in-the-middle phishing kit Tycoon 2FA.

• Effort: elementary

• Changelog:

  • 01/10/2024 - major - Update the pattern following changes in the phishing kit.

EvilProxy Phishing Domain

Detects subdomains potentially generated by the EvilProxy adversary-in-the-middle phishing platform. Inspect the other subdomains of the domain to identify the landing page, and determine if the user submitted credentials. This rule has a small percentage of false positives on legitimate domains.

• Effort: intermediate

Microsoft 365 Sign-in With No User Agent

Detects a sign-in without any User-Agent header. This may indicate that the sign-in originated from an adversary-in-the-middle phishing page or a password spraying tool. Sign-ins happening through a regular web browser always have a User-Agent header. Investigate the source IP address. If it is unknown, assume that the account's password is compromised.

• Effort: elementary

• Changelog:

  • 04/12/2023 - major - Added Login:login request type with a filter for codes indicating failure

Multiple Authentication On Microsoft 365 (Office 365) Portal From Two IP Addresses

Detection of login events from two IP addresses within 3mn, as it could happen if someone got phished with a tool like Evilginx2.

• Effort: intermediate

Possible RottenPotato Attack

Detects logon events that have characteristics of events generated during an attack leveraging RottenPotato.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Potential Azure AD Phishing Page (Adversary-in-the-Middle)

Detects an HTTP request to an URL typical of the Azure AD authentication flow, but towards a domain that is not one the legitimate Microsoft domains used for Azure AD authentication.

• Effort: intermediate

• Changelog:

  • 02/08/2024 - minor - Exclude an additionnal legitimate domain.

Sign-In Via Known AiTM Phishing Kit

Detects a sign-in attempt from an IP address belonging to a known adversary-in-the-middle phishing kit.

• Effort: elementary

• Changelog:

  • 12/12/2024 - minor - Update the selections to use a more appropriate ECS field. The rule now matches on more intakes. The name of the rule has been modified as well.

Archive Collected Data

Compress Data for Exfiltration via Archiver

Detects data compressed by specific tools.

• Effort: master

• Changelog:

  • 09/07/2024 - major - Reviewing detection to reduce false positives.

Data Compressed With Rar

An adversary may compress data in order to make it portable and minimize the amount of data sent over the network, this could be done the popular rar command line program.

• Effort: master

Data Compressed With Rar With Password

An adversary may compress data in order to make it portable and minimize the amount of data sent over the network, this could be done the popular rar command line program. This is a more specific one for rar where the arguments allow to encrypt both file data and headers with a given password.

• Effort: intermediate

PowerShell Data Compressed

Detects data compression through a PowerShell command (could be used by an adversary for exfiltration).

• Effort: advanced

Command and Control

Data Obfuscation

Suspicious ADSI-Cache Usage By Unknown Tool

Detects the usage of ADSI (LDAP) operations by tools. This may also detect tools like LDAPFragger. It needs file monitoring capabilities (Sysmon Event ID 11 with .sch file creation logging).

• Effort: advanced

Suspicious LDAP-Attributes Used

Detects the usage of particular AttributeLDAPDisplayNames, which are known for data exchange via LDAP by the tool LDAPFragger and are additionally not commonly used in companies. Careful as the 5136 is only on domain controllers and needs to be activated through the Group Policy.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Application Layer Protocol

Bazar Loader DGA (Domain Generation Algorithm)

Detects Bazar Loader domains based on the Bazar Loader DGA

• Effort: elementary

Cato Networks SASE High Risk Alert

Cato Networks SASE intrusion detection has detected a high risk alert.

• Effort: master

Chafer (APT 39) Activity

Detects previous Chafer (APT 39) activity attributed to OilRig as reported in Nyotron report in March 2018.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Cloudflare Gateway DNS Query Allowed to Malicious Domain

A DNS query to a domain categorized by Cloudflare Gateway as malicious was allowed because no blocking policy is configured.

• Effort: master

Cloudflare Gateway DNS Query Blocked to Malicious Domain

A DNS query to a domain categorized by Cloudflare Gateway as malicious was blocked by policy.

• Effort: master

Cloudflare Gateway HTTP File Blocked By Anti-Virus Scan

Cloudflare Gateway allows admins to enable Anti-Virus (AV) scanning of files that are uploaded or downloaded by users as the file passes through Gateway. AV scanning of files requires organizations to enable Proxy mode under Settings > Network > Layer 7 Firewall. TLS decryption is also recommended to enable inspection of HTTPS traffic.

• Effort: advanced

Cobalt Strike DNS Beaconing

Detects suspicious DNS queries known from Cobalt Strike beacons. The threshold is more than 50 suspicious DNS requests to avoid false positives.

• Effort: advanced

Cobalt Strike HTTP Default GET beaconing

Detects GET HTTP queries from known Cobalt Strike beacons (source code 4.3)

• Effort: advanced

Cobalt Strike HTTP Default POST Beaconing

Detects POST HTTP queries from known Cobalt Strike beacons (source code 4.3)

• Effort: advanced

Correlation Potential DNS Tunnel

Detects domain name which is longer than 95 characters. Long domain names are distinctive of DNS tunnels.

• Effort: advanced

• Changelog:

  • 19/07/2023 - major - New regex pattern and new filters.

Covenant Default HTTP Beaconing

Detects potential Covenant communications through the user-agent and specific urls

• Effort: intermediate

CrowdStrike Falcon Mobile Detection Critical Severity

CrowdStrike Falcon for Mobile raised an alert with critical severity

• Effort: master

CrowdStrike Falcon Mobile Detection High Severity

CrowdStrike Falcon for Mobile raised an alert with high severity

• Effort: master

CrowdStrike Falcon Mobile Detection Informational Severity

CrowdStrike Falcon for Mobile raised an alert with informational severity

• Effort: master

CrowdStrike Falcon Mobile Detection Low Severity

CrowdStrike Falcon for Mobile raised an alert with low severity

• Effort: master

CrowdStrike Falcon Mobile Detection Medium Severity

CrowdStrike Falcon for Mobile raised an alert with medium severity

• Effort: master

Cryptomining

Detection of domain names potentially related to cryptomining activities.

• Effort: master

DNS Exfiltration and Tunneling Tools Execution

Well-known DNS exfiltration tools execution

• Effort: intermediate

DNS Tunnel Technique From MuddyWater

Detecting DNS Tunnel Activity For Muddywater intrusion set. This is the loading of a specific DLL from an Excel macro which is detected.

• Effort: elementary

Detect requests to Konni C2 servers

This rule detects requests to Konni C2 servers. These patterns come from an analysis done in 2022, September.

• Effort: elementary

Dynamic DNS Contacted

Detect communication with dynamic dns domain. This kind of domain is often used by attackers. This rule can trigger false positive in non-controlled environment because dynamic dns is not always malicious.

• Effort: master

Exfiltration And Tunneling Tools Execution

Execution of well known tools for data exfiltration and tunneling

• Effort: advanced

FoggyWeb HTTP Default GET/POST Requests

Detects GET or POST request pattern observed within the first FoggyWeb campaign detected by Microsoft.

• Effort: advanced

Google Workspace External Sharing

Detects a large number of external sharing.

• Effort: master

• Changelog:

  • 20/06/2024 - minor - Adding new elements to increase detection.

Koadic MSHTML Command

Detects Koadic payload using MSHTML module

• Effort: intermediate

LokiBot Default C2 URL

Detects default C2 URL for trojan LokiBot

• Effort: elementary

Many Downloads From Several Binaries

Threat Actors might use all the binaries to download the payload to make sure at least one is present on the target. The prerequisites are to enable monitoring of the connect syscall using Auditbeat.

• Effort: advanced

Nimbo-C2 User Agent

Nimbo-C2 Uses an unusual User-Agent format in its implants.

• Effort: intermediate

Potential Bazar Loader User-Agents

Detects potential Bazar loader communications through the user-agent

• Effort: elementary

Potential Lemon Duck User-Agent

Detects LemonDuck user agent. The format used two sets of alphabetical characters separated by dashes, for example "User-Agent: Lemon-Duck-[A-Z]-[A-Z]".

• Effort: elementary

Potential LokiBot User-Agent

Detects potential LokiBot communications through the user-agent

• Effort: intermediate

• Changelog:

  • 04/08/2023 - minor - Added a condition to only match on internal IP as source

Python HTTP Server

Detects command used to start a Simple HTTP server in Python. Threat actors could use it for data extraction, hosting a webshell or else.

• Effort: intermediate

Raccoon Stealer 2.0 Legitimate Third-Party DLL Download URL

Detects Raccoon Stealer 2.0 malware downloading legitimate third-party DLLs from its C2 server. These legitimate DLLs are used by the information stealer to collect data on the compromised hosts.

• Effort: elementary

• Changelog:

  • 13/06/2023 - minor - Adding private IPs as sources

SEKOIA.IO Intelligence Feed

Detect threats based on indicators of compromise (IOCs) collected by SEKOIA's Threat and Detection Research team.

• Effort: elementary

Sliver DNS Beaconing

Detects suspicious DNS queries known from Sliver beaconing

• Effort: intermediate

Suspicious LDAP-Attributes Used

Detects the usage of particular AttributeLDAPDisplayNames, which are known for data exchange via LDAP by the tool LDAPFragger and are additionally not commonly used in companies. Careful as the 5136 is only on domain controllers and needs to be activated through the Group Policy.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Suspicious Windows DNS Queries

Detects a suspicious Windows command-line process making a DNS query via known abuse text paste web services. This is based on Microsoft Windows Sysmon events (Event ID 22).

• Effort: advanced

• Changelog:

  • 02/08/2023 - minor - Added a new field and filters to reduce false positives.

Trellix Network Security Threat Blocked

Trellix Network Security has detected a malicious traffic and blocked it.

• Effort: master

Trellix Network Security Threat Notified

Trellix Network Security has detected a malicious traffic and raised an alert.

• Effort: master

TrevorC2 HTTP Communication

Detects TrevorC2 HTTP communication based on the HTTP request URI and the user-agent.

• Effort: elementary

Proxy

Microsoft 365 Authenticated Activity From Tor IP Address

Detects authenticated Microsoft 365 activity from an IP address associated with Tor.

• Effort: advanced

Netsh Port Forwarding

Detects netsh commands that enable a port forwarding between to hosts. This can be used by attackers to tunnel RDP or SMB shares for example.

• Effort: intermediate

• Changelog:

  • 15/02/2024 - minor - Added filter to reduce false positives

Suspicious Hostname

Detects suspicious hostnames such as ones with kali in it, to detect kali linux default hosts, but also other hostnames commonly used in attacks. List can be improved according to the environment.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Suspicious TOR Gateway

Detects suspicious TOR gateways. Gateways are often used by the victim to pay and decrypt the encrypted files without installing TOR. Tor intercepts the network traffic from one or more apps on user’s computer, usually the user web browser, and shuffles it through a number of randomly-chosen computers before passing it on to its destination. This disguises user location, and makes it harder for servers to pick him/her out on repeat visits, or to tie together separate visits to different sites, this making tracking and surveillance more difficult. Before a network packet starts its journey, user’s computer chooses a random list of relays and repeatedly encrypts the data in multiple layers, like an onion. Each relay knows only enough to strip off the outermost layer of encryption, before passing what’s left on to the next relay in the list.

• Effort: advanced

TOR Usage

Detects TOR usage, based on the IP address and the destination port (filtered on NTP). TOR is short for The Onion Router, and it gets its name from how it works. TOR intercepts the network traffic from one or more apps on user’s computer, usually the user web browser, and shuffles it through a number of randomly-chosen computers before passing it on to its destination. This disguises user location, and makes it harder for servers to pick him/her out on repeat visits, or to tie together separate visits to different sites, this making tracking and surveillance more difficult. Before a network packet starts its journey, user’s computer chooses a random list of relays and repeatedly encrypts the data in multiple layers, like an onion. Each relay knows only enough to strip off the outermost layer of encryption, before passing what’s left on to the next relay in the list.

• Effort: master

TOR Usage Generic Rule

Detects TOR usage globally, whether the IP is a destination or source. TOR is short for The Onion Router, and it gets its name from how it works. TOR intercepts the network traffic from one or more apps on user’s computer, usually the user web browser, and shuffles it through a number of randomly-chosen computers before passing it on to its destination. This disguises user location, and makes it harder for servers to pick him/her out on repeat visits, or to tie together separate visits to different sites, this making tracking and surveillance more difficult. Before a network packet starts its journey, user’s computer chooses a random list of relays and repeatedly encrypts the data in multiple layers, like an onion. Each relay knows only enough to strip off the outermost layer of encryption, before passing what’s left on to the next relay in the list.

• Effort: master

• Changelog:

  • 26/01/2024 - minor - Modifying filter to improve rule.
  • 22/11/2023 - minor - Adding filter to improve rule.
  • 02/08/2024 - minor - Small pattern to change to match only the real tags related to TOR.

Web Service

Discord Suspicious Download

Discord is a messaging application. It allows users to create their own communities to share messages and attachments. Those attachments have little to no overview and can be downloaded by almost anyone, which has been abused by attackers to host malicious payloads.

• Effort: intermediate

• Changelog:

  • 05/08/2023 - minor - Added filters for commonly observed files extensions.

Telegram Bot API Request

Detects suspicious DNS queries to api.telegram.org used by Telegram Bots of any kind

• Effort: advanced

Ingress Tool Transfer

Cloudflare Gateway HTTP File Blocked By Anti-Virus Scan

Cloudflare Gateway allows admins to enable Anti-Virus (AV) scanning of files that are uploaded or downloaded by users as the file passes through Gateway. AV scanning of files requires organizations to enable Proxy mode under Settings > Network > Layer 7 Firewall. TLS decryption is also recommended to enable inspection of HTTPS traffic.

• Effort: advanced

Information Stealer Downloading Legitimate Third-Party DLLs

Detects operations that involved legitimate third-party DLLs used by information-stealing malware for data collection on the infected host. This detection rule correlates at least 7 events including the following DLLs - freebl3.dll, vcruntime140.dll, msvcp140.dll, nss3.dll, sqlite3.dll, softokn3.dll, mozglue.dll and libcurl.dll. This behaviour matches activities of several widespread stealer like Vidar, Raccoon Stealer v2, Mars Stealer, etc.

• Effort: intermediate

Network Connection Via Certutil

Identifies certutil.exe making a network connection. Adversaries could abuse certutil.exe to download a certificate, or malware, from a remote URL. The rule excludes private IP addresses and IPV6. This requires Sysmon logging.

• Effort: intermediate

Pandemic Windows Implant

Detects Pandemic Windows Implant through registry keys or specific command lines. Prerequisites: Logging for Registry events is needed, which can be done in the Sysmon configuration (events 12 and 13).

• Effort: intermediate

Raccoon Stealer 2.0 Legitimate Third-Party DLL Download URL

Detects Raccoon Stealer 2.0 malware downloading legitimate third-party DLLs from its C2 server. These legitimate DLLs are used by the information stealer to collect data on the compromised hosts.

• Effort: elementary

• Changelog:

  • 13/06/2023 - minor - Adding private IPs as sources

Rclone Process

Detects Rclone executable or Rclone execution by using the process name, the execution through a command obfuscated or not.

• Effort: advanced

• Changelog:

  • 28/06/2023 - minor - Added filter to the rule to reduce false positives.
  • 05/08/2024 - major - Edited pattern of the rule to reduce false positives.

Suspicious Desktopimgdownldr Execution

Detects a suspicious Desktopimgdownldr execution. Desktopimgdownldr.exe is a Windows binary used to configure lockscreen/desktop image and can be abused to download malicious file.

• Effort: intermediate

Suspicious Finger Usage

Detects suspicious aged finger.exe tool execution often used in malware attacks nowadays. An attacker can use finger to silently retrieve a command, a script or a payload from a remote server. For example, the tool Darkfinger-C2 uses this technique to download files from the C2 channel.

• Effort: intermediate

Suspicious Headless Web Browser Execution To Download File

Detects a suspicious command used to execute a Chromium-based web browser (Chrome or Edge) using the headless mode, meaning that the browser window wouldn't be visible, and the dump mode to download a file. This technique can be used to fingerprint the compromised host, in particular by the Ducktail infostealer.

• Effort: elementary

Suspicious URI Used In A Lazarus Campaign

Detects suspicious requests to a specific URI, usually on an .asp page. The website is often compromised.

• Effort: intermediate

Suspicious certutil command

Detects suspicious certutil command which can be used by threat actors to download and/or decode payload.

• Effort: intermediate

• Changelog:

  • 15/02/2023 - minor - "encode" and "decode" were removed as it was causing too much false positives while not being the main usage of the certutil command by attackers.

Data Encoding

DNS Exfiltration and Tunneling Tools Execution

Well-known DNS exfiltration tools execution

• Effort: intermediate

Traffic Signaling

Binary List Tcp

A binary is trying to list TCP connections. The prerequisites are to enable monitoring of the open and openat syscalls using Auditbeat.

• Effort: advanced

Remote Access Software

Antivirus Exploitation Framework Detection

Detects a highly relevant Antivirus alert that reports an exploitation framework. This is based on Windows Defender logs (Event ID 1116 and 1117).

• Effort: elementary

Antivirus Password Dumper Detection

Detects a highly relevant Antivirus alert that reports a password dumper. This detection relies on Windows Defender events logs. This is based on Windows Defender logs (Event ID 1116 and 1117).

• Effort: elementary

Antivirus Relevant File Paths Alerts

Detects an Antivirus alert in a highly relevant file path or with a relevant file name. This is only based on Windows Defender events.

• Effort: intermediate

• Changelog:

  • 15/02/2024 - minor - Effort level was adapted according to the observed hits for the rule.
  • 26/03/2024 - major - Rule's pattern field changed

Remote Access Tool Domain

Detects traffic toward a domain flagged as a Remote Administration Tool (RAT).

• Effort: master

Remote Monitoring and Management Software - AnyDesk

Detect artifacts related to the installation or execution of the Remote Monitoring and Management tool AnyDesk.

• Effort: master

Remote Monitoring and Management Software - Atera

Detect artifacts related to the installation or execution of the Remote Monitoring and Management tool Atera.

• Effort: master

Suspicious Activity Using Quick Assist

Detects when a chat is created (abusing Quick Assist feature) with a user external to the domain, which has been observed as a some phishing attemp by ransomware groups.

• Effort: elementary

Dynamic Resolution

Gatewatcher AionIQ V103 Dga Detect

Detects when an event related to dga is raised by gatewatcher. An attacker can use this to generate a new domain for C2.

• Effort: master

Non-Standard Port

RDP Port Change Using Powershell

Detects RDP port configuration change using a PowerShell command such as 'Set-ItemProperty -Path "HKLM:\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" -Name PortNumber -Value XXX Restart-Service termservice -force'. Threat actors can change RDP to another port to bypass protections, avoid detection based on the port, or to take full control of the system.

• Effort: intermediate

Suspicious Network Args In Command Line

Detection on some commonly observed suspicious processes command lines using HTTP schema with port 443.

• Effort: intermediate

• Changelog:

  • 10/08/2023 - major - Added a list of suspicious processes to drastically reduce false positives.

Protocol Tunneling

Exfiltration And Tunneling Tools Execution

Execution of well known tools for data exfiltration and tunneling

• Effort: advanced

Netsh Port Forwarding

Detects netsh commands that enable a port forwarding between to hosts. This can be used by attackers to tunnel RDP or SMB shares for example.

• Effort: intermediate

• Changelog:

  • 15/02/2024 - minor - Added filter to reduce false positives

Ngrok Process Execution

Detects possible Ngrok execution, which can be used by attacker for RDP tunneling.

• Effort: intermediate

Potential DNS Tunnel

Detects domain name which is longer than 95 characters. Long domain names are distinctive of DNS tunnels.

• Effort: advanced

• Changelog:

  • 22/06/2023 - minor - Filter some domains to reduce false positives.
  • 19/07/2023 - major - New regex pattern and new filters.

SOCKS Tunneling Tool

Detects the usage of a SOCKS tunneling tool, often used by threat actors. These tools often use the socks5 commandline argument, however socks4 can sometimes be used as well. Unfortunately, socks alone (without any number) triggered too many false positives.

• Effort: intermediate

• Changelog:

  • 20/06/2024 - minor - Added filter to reduce false positives

SSH Port Binding

When a user uses SSH tunneling in Linux, the sshd process binds sockets to communicate with the client machine via a ssh tunnel. With SSH tunneling, the SSH server can be used as a getaway to access internal systems. The traffic will seem to be coming from the SSH server whereas it only acts as a relay for an attacker. By using this technique, an attacker can successfully bypass external firewall rules. This rule is the most basic one (compared to the other one - SSH Tunnel), however it can detect the -D option in the ssh command if the machine is the client. This rule will detect the port binding (port 6010) when X11 forwarding is used. It will detect -R (server side), -D (client side) -X (server side), -Y (server side) and -L (client side) port binding.

• Effort: advanced

SSH Tunnel Traffic

When a user creates and uses a SSH tunnel in Linux, the sshd process opens sockets to communicate with other machines or ports. With SSH tunneling, the SSH server can be used as a getaway to access internal systems. The traffic will seem to be coming from the SSH server whereas it only acts as a relay for an attacker. By using this technique, an attacker can successfully bypass external firewall rules and gain foothold to your network, allowing him to scan,hunt and attack your internal systems. This rule includes a filter on port 22, this filter is created to avoid false positive when a user is connecting via ssh. If you do not use port 22 for your machines, please create an alert filter.

• Effort: advanced

SSH X11 Forwarding

When a user creates and uses SSH X11 Forwarding in Linux, the sshd process opens sockets to communicate with the client machine via a ssh tunnel. X11 forwarding is used to deport graphic programs on the client side.

• Effort: advanced

Socat Relaying Socket

Socat is a linux tool used to relay local socket or internal network connection, this technics is often used by attacker to bypass security equipment such as firewall

• Effort: advanced

• Changelog:

  • 14/06/2023 - minor - Added filter to the rule to reduce false positives.

Socat Reverse Shell Detection

Socat is a linux tool used to relay or open reverse shell that is often used by attacker to bypass security equipment.

• Effort: intermediate

• Changelog:

  • 14/06/2023 - minor - Added filter to the rule to reduce false positives.

Venom Multi-hop Proxy agent detection

Detects Venom Multi-hop Proxy agent.

• Effort: intermediate

Exfiltration

Automated Exfiltration

AWS CloudTrail RDS Change Master Password

Detects the change of database master password. It may be a part of data exfiltration.

• Effort: intermediate

AWS CloudTrail RDS Public DB Restore

Detects the recovery of a new public database instance from a snapshot. It may be a part of data exfiltration.

• Effort: intermediate

Python Exfiltration Tools

Python has some built-in modules or library that could be installed and later be used as exflitration tool by an attacker

• Effort: advanced

Scheduled Transfer

Gatewatcher AionIQ V103 Malicious Powershell Detect

Detects malicious powershell by Gatewatcher V103.

• Effort: master

Exfiltration Over C2 Channel

Claroty xDome Network Threat Detection Alert

Claroty xDome has raised an network threat detection alert.

• Effort: master

Exfiltration And Tunneling Tools Execution

Execution of well known tools for data exfiltration and tunneling

• Effort: advanced

Forcepoint Secure Web Gateway Compromised Websites

Forcepoint Secure Web Gateway has detected an access to an IP/domain tagged as compromised. Even if it has been blocked, it could be interesting to investigate the source asset.

• Effort: master

Forcepoint Secure Web Gateway Malicious Websites

Forcepoint Secure Web Gateway has detected an access to an IP/domain tagged as malicious. Even if it has been blocked, it could be interesting to investigate the source asset.

• Effort: master

Gatewatcher AionIQ Malware Alert

Forward malware information reported by Gatewatcher AionIQ

• Effort: master

Gatewatcher AionIQ Network Alert

Forward network alerts reported by Gatewatcher AionIQ

• Effort: master

Gatewatcher AionIQ V103 Beacon Detect

Detects a suspicious beacon.

• Effort: master

Gatewatcher AionIQ V103 Sigflow Alert

Detects a sigflow alert by Gatewatcher AionIQ V103.

• Effort: master

Netsh Port Forwarding

Detects netsh commands that enable a port forwarding between to hosts. This can be used by attackers to tunnel RDP or SMB shares for example.

• Effort: intermediate

• Changelog:

  • 15/02/2024 - minor - Added filter to reduce false positives

Netskope Alert

Forward alerts reported by Netskope.

• Effort: master

• Changelog:

  • 28/03/2024 - minor - Rule effort was updated to master

Remote File Copy

Detects the use of remote tools that copy files from or to remote systems

• Effort: master

SEKOIA.IO Intelligence Feed

Detect threats based on indicators of compromise (IOCs) collected by SEKOIA's Threat and Detection Research team.

• Effort: elementary

Exfiltration Over Alternative Protocol

1Password EPM Share Externally

Detects when an item from 1Password is shared externally.

• Effort: master

DNS Exfiltration and Tunneling Tools Execution

Well-known DNS exfiltration tools execution

• Effort: intermediate

Exfiltration Domain

Detects traffic toward a domain flagged as a possible exfiltration vector.

• Effort: master

• Changelog:

  • 29/02/2024 - minor - enforce detection by adding tag

Exfiltration Domain In Command Line

Detects commands containing a domain linked to http exfiltration.

• Effort: intermediate

Potential DNS Tunnel

Detects domain name which is longer than 95 characters. Long domain names are distinctive of DNS tunnels.

• Effort: advanced

• Changelog:

  • 22/06/2023 - minor - Filter some domains to reduce false positives.
  • 19/07/2023 - major - New regex pattern and new filters.

Powershell UploadString Function

Powershell's uploadXXX functions are a category of methods which can be used to exfiltrate data through native means on a Windows host.

• Effort: intermediate

TUN/TAP Driver Installation

Detects the installation of the TUN or TAP driver service, this activity could be related to data exfiltration using tunneling techniques. The TUN/TAP Windows Adapter is a network driver that enables some VPN providers to facilitate a VPN connection to their server. TUN/TAP driver is only used by specific VPNs (e.g. OpenVPN, Wireguard), not by thoses based on IKE protocols (e.g. IPsec).

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Transfer Data to Cloud Account

AWS CloudTrail EC2 VM Export Failure

Detects attempt to export an AWS EC2 instance. A VM Export might indicate an attempt to extract information from an instance.

• Effort: intermediate

Google Cloud Audit Logs Drive Ownership Transferred

Detects when Drive/Docs user files ownership is transferred. The legit use case is when a user is being removed, but this could also be abused by an attacker for exfiltration.

• Effort: advanced

Exfiltration Over Web Service

Exfiltration Domain

Detects traffic toward a domain flagged as a possible exfiltration vector.

• Effort: master

• Changelog:

  • 29/02/2024 - minor - enforce detection by adding tag

Exfiltration Domain In Command Line

Detects commands containing a domain linked to http exfiltration.

• Effort: intermediate

Outgoing Bytes Peak

Spots outgoing bytes traffic peak to detect a data exfiltration.

• Effort: advanced

• Changelog:

  • 28/05/2024 - major - On Fortinet Fortigate intakes, events other than 0000000013 are now ignored.

Powershell UploadString Function

Powershell's uploadXXX functions are a category of methods which can be used to exfiltrate data through native means on a Windows host.

• Effort: intermediate

Rclone Process

Detects Rclone executable or Rclone execution by using the process name, the execution through a command obfuscated or not.

• Effort: advanced

• Changelog:

  • 28/06/2023 - minor - Added filter to the rule to reduce false positives.
  • 05/08/2024 - major - Edited pattern of the rule to reduce false positives.

Impact

Data Destruction

AWS CloudTrail ECS Cluster Deleted

Detects when an attacker is destroying an AWS ECS Cluster

• Effort: intermediate

AWS CloudTrail RDS DB Cluster/Instance Deleted

Detects when an attacker is destroying a RDS Cluster or Instance

• Effort: advanced

Backup Catalog Deleted

The rule detects when the Backup Catalog has been deleted. It means the administrators will not be able to access any backups that were created earlier to perform recoveries. This is often being done using the wbadmin.exe tool.

• Effort: intermediate

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Commonly Used Commands To Stop Services And Remove Backups

Detects specific commands used regularly by ransomwares to stop services or remove backups

• Effort: intermediate

Secure Deletion With SDelete

Detects renaming of file while deletion with SDelete tool. SDelete is a tool that permits to securely delete files by overwriting them (no recovery possible). Few threat actors are using it to delete traces of their malware.

• Effort: intermediate

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed

Data Encrypted for Impact

Gatewatcher AionIQ V103 Ransomware Detect

Detects when a ransomware is detected by gatewatcherV103.

• Effort: master

Suncrypt Parameters

Detects SunCrypt ransomware's parameters, most of which are unique.

• Effort: elementary

Varonis Many File Created and Deleted

This rule identifies a high number of file created and deleted on the same host. It is a typical ransomware behavior.

• Effort: master

Varonis Massive Dowloads By A Single User

This rule identifies a high number of File dowloaded by a single user.

• Effort: master

Service Stop

Commonly Used Commands To Stop Services And Remove Backups

Detects specific commands used regularly by ransomwares to stop services or remove backups

• Effort: intermediate

Correlation Multi Service Disable

The rule detects a high number of services stopped or de-activated in a short period of time.

• Effort: master

• Changelog:

  • 21/08/2024 - minor - Adding a space to reduce false positives.

Disabled Service

Service disabling can be abused by attacker to deny security mecanisms (eg: firewall, EDR, ect) and it is also often used by cryptominer to exploit as much RAM & CPU as possible on infected host. The prerequisites are to enable monitoring of the truncate, rename and unlink syscalls using Auditbeat.

• Effort: advanced

Inhibit System Recovery

Commonly Used Commands To Stop Services And Remove Backups

Detects specific commands used regularly by ransomwares to stop services or remove backups

• Effort: intermediate

Inhibit System Recovery Deleting Backups

Detects adversaries attempts to delete backups or inhibit system recovery. This rule relies on differents known techniques using Windows events logs from Sysmon (ID 1), and PowerShell (ID 4103, 4104).

• Effort: intermediate

• Changelog:

  • 31/01/2024 - minor - Improve selection filter

Stop Backup Services

Detects adversaries attempts to stop backups services or disable Windows previous files versions feature. This could be related to ransomware operators or legit administrators. This rule relies Windows command line logging and registry logging, and PowerShell (ID 4103, 4104).

• Effort: master

• Changelog:

  • 21/06/2024 - major - Update detection pattern for ECS fields/value compliance
  • 16/05/2024 - minor - add pattern to extend and improve detection

Suncrypt Parameters

Detects SunCrypt ransomware's parameters, most of which are unique.

• Effort: elementary

Network Denial of Service

Anomaly CloudFlare DDoS

Detects anomaly on volume of DNS events from CloudFlare logs.

• Effort: master

Endpoint Denial of Service

Audit CVE Event

Detects events generated by Windows to indicate the exploitation of a known vulnerability.

• Effort: elementary

• Changelog:

  • 15/07/2024 - major - review filter and improve similarity

System Shutdown/Reboot

Rebooting

Detects when forcing a computer to shutdown.

• Effort: master

Account Access Removal

Computer Account Deleted

Detects computer account deletion.

• Effort: master

• Changelog:

  • 26/03/2024 - major - Rule's pattern field changed

Google Workspace Admin Deletion

Detects when an admin is deleted or when his role is unassigned.

• Effort: master

Google Workspace User Deletion

Detects when an user is deleted.

• Effort: master

Google Workspace User Suspended

Detects when an user is suspended. An attacker can use this to remove an account used during the intrusion.

• Effort: master

Jumpcloud Account Locked

A user has been locked on Jumpcloud portal.

• Effort: intermediate

Okta User Account Locked

An user has been locked in Okta.

• Effort: intermediate

Privileged AD Builtin Group Modified

Detects changes to privileged AD builtin groups in Active Directory that could indicate malicious or unexpected administrative activity. This detection rule detects changes on specific groups that are Administrators (S-1-5--500), Domain Admins (S-1-5--512), Enterprise Admins (S-1-5--519), Schema Admins (S-1-5--518), Account Operators (S-1-5-32-548) and Backup Operators (S-1-5-32-551).

• Effort: master

• Changelog:

  • 10/07/2023 - minor - Added AD groups and change to effort master.
  • 26/03/2024 - major - Rule's pattern field changed

User Account Deleted

Detects local user deletion

• Effort: master

• Changelog:

  • 04/04/2024 - major - Rule's pattern field changed