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Cisco Secure Firewall

Overview

The Cisco Secure Firewall (formely Next-Generation Firewall) is a security product to protect your network, from physical ones to ones hosted in the cloud.

Cisco Secure Firewall include:

  • Adaptive Security Appliance (ASA): that combines firewall, antivirus, intrusion prevention, and virtual private network (VPN) capabilities.
  • Firepower Threat Defense (FTD): a unified software image, which includes the Cisco ASA features and FirePOWER Services. This unified software is capable of offering the function of ASA and FirePOWER in one platform, both in terms of hardware and software features.
  • Next Generation IPS (NGIPS): that detect and stop intrusions in your internal network or in your public cloud. NGIPS helps you to mitigate vulnerabilities and manage patch application helps you to mitigate vulnerabilities and manage patch applications.

Sending Cisco logs to Sekoia.io will help you discovering potential network security threats, which are contextualized thanks to our Cyber Threat Intelligence (CTI).

Benefit from SEKOIA.IO built-in rules and upgrade Cisco Secure Firewall with the following detection capabilities out-of-the-box.

SEKOIA.IO x Cisco Secure Firewall on ATT&CK Navigator

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
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
Bloodhound and Sharphound Tools Usage

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

  • Effort: intermediate
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
CMSTP Execution

Detects various indicators of Microsoft Connection Manager Profile Installer execution

  • Effort: intermediate
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
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 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-2021-20023 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
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 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: intermediate
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-2021-26855 Exchange SSRF

Detects the exploitation of ProyxLogon vulerability on Exchange servers.

  • Effort: advanced
CVE-2021-34473 ProxyShell Attempt

Detects CVE-2021-34473 ProxyShell attempt against Microsoft Exchange Server, Remote Code Execution Vulnerability.

  • Effort: advanced
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
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
Cobalt Strike Default Beacons Names

Detects the default names of Cobalt Strike beacons / payloads.

  • Effort: elementary
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
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
Download Files From Suspicious TLDs

Detects download of certain file types from hosts in suspicious TLDs

  • Effort: master
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
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
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
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.

  • Effort: advanced
Koadic MSHTML Command

Detects Koadic payload using MSHTML module

  • Effort: intermediate
LokiBot Default C2 URL

Detects default C2 URL for trojan LokiBot

  • Effort: elementary
Network Scanning and Discovery

Tools and command lines used for network discovery from current system

  • Effort: advanced
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
Nimbo-C2 User Agent

Nimbo-C2 Uses an unusual User-Agent format in its implants.

  • Effort: intermediate
PasswordDump SecurityXploded Tool

Detects the execution of the PasswordDump SecurityXploded Tool

  • Effort: elementary
Possible Malicious File Double Extension

Detects request to potential malicious file with double extension

  • Effort: elementary
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
Potential Bazar Loader User-Agents

Detects potential Bazar loader communications through the user-agent

  • Effort: elementary
Potential DNS Tunnel

Detects domain name which is longer than 95 characters. Long domain names are distinctive of DNS tunnels.

  • Effort: advanced
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
Privilege Escalation Awesome Scripts (PEAS)

Detect PEAS privileges escalation scripts and binaries

  • Effort: elementary
ProxyShell Exchange Suspicious Paths

Detects suspicious calls to Exchange resources, in locations related to webshells observed in campaigns using this vulnerability.

  • Effort: elementary
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
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
RTLO Character

Detects RTLO (Right-To-Left character) in file and process names.

  • Effort: elementary
RYUK Ransomeware - martinstevens Username

Detects user name "martinstevens". Wizard Spider is used to add the user name "martinstevens" to the AD of its victims. It was observed in several campaigns; in 2019 and 2020.

  • 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
SharePoint Authenticated SSRF

Detects succesful SSRF from an authenticated SharePoint user.

  • Effort: elementary
Sliver DNS Beaconing

Detects suspicious DNS queries known from Sliver beaconing

  • Effort: intermediate
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
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: elementary
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
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 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
System Info Discovery

System info discovery, attempt to detects basic command use to fingerprint a host

  • Effort: master
Telegram Bot API Request

Detects suspicious DNS queries to api.telegram.org used by Telegram Bots of any kind

  • Effort: advanced
WCE wceaux.dll Creation

Detects wceaux.dll creation while Windows Credentials Editor (WCE) is executed.

  • Effort: intermediate

Event Categories

The following table lists the data source offered by this integration.

Data Source Description
Host network interface every packets are logged and information on the outcome, the source/destination are extracted
Network device logs ACL logs are examined in detail
Network protocol analysis ICMP, TCP and UDP packets are fully analyzed
Web proxy Cisco Web Security Appliance logs provide information about the connected client and the requested resource
Web logs Cisco Web Security Appliance logs provide information about the connected client and the requested resource

In details, the following table denotes the type of events produced by this integration.

Name Values
Kind alert, event
Category file, intrusion_detection, malware, network
Type change, connection, end, info, start

Event Samples

Find below few samples of events and how they are normalized by Sekoia.io.

{
    "message": "%FTD-2-106001: Inbound TCP connection denied from 172.16.10.234/901 to 192.168.122.55/111 flags SYN  on interface LAN",
    "event": {
        "code": "106001",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Firepower Threat Defense"
    },
    "action": {
        "target": "network-traffic",
        "name": "denied"
    },
    "destination": {
        "ip": "192.168.122.55",
        "port": 111,
        "address": "192.168.122.55"
    },
    "network": {
        "direction": "Inbound",
        "transport": "tcp"
    },
    "source": {
        "ip": "172.16.10.234",
        "port": 901,
        "address": "172.16.10.234"
    },
    "related": {
        "ip": [
            "172.16.10.234",
            "192.168.122.55"
        ]
    }
}

{
    "message": "%FTD-2-106006: Deny inbound UDP from 172.16.10.234/901 to 192.168.122.55/111 on interface LAN",
    "event": {
        "code": "106006",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Firepower Threat Defense"
    },
    "action": {
        "target": "network-traffic",
        "name": "deny"
    },
    "destination": {
        "ip": "192.168.122.55",
        "port": 111,
        "address": "192.168.122.55"
    },
    "network": {
        "direction": "inbound",
        "transport": "udp"
    },
    "source": {
        "ip": "172.16.10.234",
        "port": 901,
        "address": "172.16.10.234"
    },
    "related": {
        "ip": [
            "172.16.10.234",
            "192.168.122.55"
        ]
    }
}

{
    "message": "%NGIPS-1-430002: EventPriority: Low, DeviceUUID: b2433c5c-a6a1-11eb-a6e7-be0b9833091f, InstanceID: 2, FirstPacketSecond: 2021-04-30T11:31:19Z, ConnectionID: 4, AccessControlRuleAction: Allow, SrcIP: 172.16.10.10, DstIP: 172.16.20.10, ICMPType: Echo Request, ICMPCode: No Code, Protocol: icmp, IngressInterface: inside, EgressInterface: outside, ACPolicy: Default Allow All Traffic, AccessControlRuleName: test, Client: ICMP client, ApplicationProtocol: ICMP, InitiatorPackets: 1, ResponderPackets: 0, InitiatorBytes: 74, ResponderBytes: 0, NAPPolicy: Balanced Security and Connectivity",
    "event": {
        "code": "430002",
        "kind": "event",
        "category": [
            "network"
        ],
        "action": "connection-started",
        "type": [
            "connection",
            "start"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Secure IPS"
    },
    "action": {
        "target": "network-traffic"
    },
    "destination": {
        "bytes": 0,
        "ip": "172.16.20.10",
        "packets": 0,
        "address": "172.16.20.10"
    },
    "log": {
        "level": "Low"
    },
    "network": {
        "application": "icmp client",
        "protocol": "ICMP",
        "transport": "icmp"
    },
    "rule": {
        "name": "test",
        "ruleset": "Default Allow All Traffic"
    },
    "source": {
        "bytes": 74,
        "ip": "172.16.10.10",
        "packets": 1,
        "address": "172.16.10.10"
    },
    "related": {
        "ip": [
            "172.16.10.10",
            "172.16.20.10"
        ]
    }
}

{
    "message": "%NGIPS-1-430003: EventPriority: Low, DeviceUUID: e8566508-eaa9-11e5-860f-de3e305d8269, InstanceID: 3, FirstPacketSecond: 2020-02-04T08:45:34Z, ConnectionID: 34774, AccessControlRuleAction: <br/>Block with reset, SrcIP: 93.157.158.93, DstIP: 10.1.9.9, SrcPort: 13723, DstPort: 80, Protocol: tcp, IngressInterface: outside, EgressInterface: seversDMZ, ACPolicy: Basic IPS/IDS and GeoIP block foreign contries, AccessControlRuleName: GeoBlock other Countries, Prefilter Policy: Unknown, ConnectionDuration: 0, InitiatorPackets: 1, ResponderPackets: 0, InitiatorBytes: 54, ResponderBytes: 0, NAPPolicy: Balanced Security and Connectivity",
    "event": {
        "code": "430003",
        "kind": "event",
        "category": [
            "network"
        ],
        "action": "connection-finished",
        "type": [
            "connection",
            "end"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Secure IPS"
    },
    "action": {
        "target": "network-traffic"
    },
    "destination": {
        "bytes": 0,
        "ip": "10.1.9.9",
        "packets": 0,
        "port": 80,
        "address": "10.1.9.9"
    },
    "log": {
        "level": "Low"
    },
    "network": {
        "transport": "tcp"
    },
    "rule": {
        "name": "GeoBlock other Countries",
        "ruleset": "Basic IPS/IDS and GeoIP block foreign contries"
    },
    "source": {
        "bytes": 54,
        "ip": "93.157.158.93",
        "packets": 1,
        "port": 13723,
        "address": "93.157.158.93"
    },
    "related": {
        "ip": [
            "10.1.9.9",
            "93.157.158.93"
        ]
    }
}

{
    "message": "%FTD-1-430005: SrcIP: 10.0.1.20, DstIP: 81.2.69.144, SrcPort: 46004, DstPort: 80, Protocol: tcp, FileDirection: Download, FileAction: Malware Cloud Lookup, FileSHA256: 2546dcffc5ad854d4ddc64fbf056871cd5a00f2471cb7a5bfd4ac23b6e9eedad, SHA_Disposition: Unavailable, SperoDisposition: Spero detection not performed on file, ThreatName: Win.Ransomware.Eicar::95.sbx.tg, FileName: eicar_com.zip, FileType: ZIP, FileSize: 184, ApplicationProtocol: HTTP, Client: cURL, User: No Authentication Required, FirstPacketSecond: 2019-08-16T09:39:02Z, FilePolicy: malware-and-file-policy, FileStorageStatus: Not Stored (Disposition Was Pending), FileSandboxStatus: File Size Is Too Small, URI: http://www.eicar.org/download/eicar_com.zip",
    "event": {
        "code": "430005",
        "kind": "alert",
        "category": [
            "malware"
        ],
        "action": "malware-detected",
        "type": [
            "info"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Firepower Threat Defense"
    },
    "action": {
        "target": "network-traffic"
    },
    "cisco": {
        "ftd": {
            "file_sandbox_status": "File Size Is Too Small",
            "file_storage_status": "Not Stored (Disposition Was Pending)",
            "sha_disposition": "Unavailable",
            "spero_disposition": "Spero detection not performed on file"
        }
    },
    "destination": {
        "ip": "81.2.69.144",
        "port": 80,
        "address": "81.2.69.144"
    },
    "file": {
        "extension": "zip",
        "hash": {
            "sha256": "2546dcffc5ad854d4ddc64fbf056871cd5a00f2471cb7a5bfd4ac23b6e9eedad"
        },
        "name": "eicar_com.zip",
        "size": 184
    },
    "network": {
        "application": "curl",
        "protocol": "HTTP",
        "transport": "tcp"
    },
    "source": {
        "ip": "10.0.1.20",
        "port": 46004,
        "address": "10.0.1.20"
    },
    "threat": {
        "software": {
            "name": "Win.Ransomware.Eicar::95.sbx.tg"
        }
    },
    "url": {
        "original": "http://www.eicar.org/download/eicar_com.zip",
        "domain": "www.eicar.org",
        "top_level_domain": "org",
        "subdomain": "www",
        "registered_domain": "eicar.org",
        "path": "/download/eicar_com.zip",
        "scheme": "http",
        "port": 80
    },
    "user": {
        "name": "No Authentication Required"
    },
    "related": {
        "hash": [
            "2546dcffc5ad854d4ddc64fbf056871cd5a00f2471cb7a5bfd4ac23b6e9eedad"
        ],
        "ip": [
            "10.0.1.20",
            "81.2.69.144"
        ],
        "user": [
            "No Authentication Required"
        ]
    }
}

{
    "message": "%ASA-6-106012: Deny IP from 192.168.122.143 to 224.0.0.22, IP options: \"Router Alert\"",
    "event": {
        "code": "106012",
        "kind": "event",
        "category": [
            "network"
        ],
        "reason": "IP options: \"Router Alert\""
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "deny"
    },
    "destination": {
        "ip": "224.0.0.22",
        "address": "224.0.0.22"
    },
    "source": {
        "ip": "192.168.122.143",
        "address": "192.168.122.143"
    },
    "related": {
        "ip": [
            "192.168.122.143",
            "224.0.0.22"
        ]
    }
}

{
    "message": "%ASA-6-106015: Deny TCP (no connection) from 10.9.4.3/52675 to 161.5.222.141/443 flags FIN ACK on interface ACME_interface",
    "event": {
        "code": "106015",
        "kind": "event",
        "category": [
            "network"
        ],
        "reason": "no connection"
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "deny"
    },
    "destination": {
        "ip": "161.5.222.141",
        "port": 443,
        "address": "161.5.222.141"
    },
    "network": {
        "transport": "tcp"
    },
    "source": {
        "ip": "10.9.4.3",
        "port": 52675,
        "address": "10.9.4.3"
    },
    "related": {
        "ip": [
            "10.9.4.3",
            "161.5.222.141"
        ]
    }
}

{
    "message": "%ASA-4-106023: Deny udp src ACMEsL:10.0.200.29/320 dst identity:224.0.1.129/320 by access-group \"ACME_group\" [0x0, 0x0]",
    "event": {
        "code": "106023",
        "kind": "event",
        "category": [
            "network"
        ],
        "reason": "ACME_group"
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "deny"
    },
    "destination": {
        "ip": "224.0.1.129",
        "port": 320,
        "address": "224.0.1.129"
    },
    "network": {
        "transport": "udp"
    },
    "source": {
        "ip": "10.0.200.29",
        "port": 320,
        "address": "10.0.200.29"
    },
    "related": {
        "ip": [
            "10.0.200.29",
            "224.0.1.129"
        ]
    }
}

{
    "message": "%ASA-6-106100: access-list ACME_INFRA permitted udp ACME_INFRA/10.1.0.16(42592) -> ACME/10.1.1.76(161) hit-cnt 1 first hit [0x42666c4c, 0x05739900]",
    "event": {
        "code": "106100",
        "kind": "event",
        "category": [
            "network"
        ],
        "reason": "ACME_INFRA"
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "permitted"
    },
    "destination": {
        "ip": "10.1.1.76",
        "port": 161,
        "address": "10.1.1.76"
    },
    "network": {
        "transport": "udp"
    },
    "source": {
        "ip": "10.1.0.16",
        "port": 42592,
        "address": "10.1.0.16"
    },
    "related": {
        "ip": [
            "10.1.0.16",
            "10.1.1.76"
        ]
    }
}

{
    "message": "%ASA-6-110003: Routing failed to locate next hop for icmp from WAN:10.11.0.2/0 to WAN:10.112.115.1/0",
    "event": {
        "code": "110003",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "routing failed to locate next hop for icmp"
    },
    "destination": {
        "ip": "10.112.115.1",
        "address": "10.112.115.1"
    },
    "source": {
        "ip": "10.11.0.2",
        "address": "10.11.0.2"
    },
    "related": {
        "ip": [
            "10.11.0.2",
            "10.112.115.1"
        ]
    }
}

{
    "message": "%ASA-5-111007: Begin configuration: 10.24.25.21 reading from http [POST]",
    "event": {
        "code": "111007",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "begin configuration"
    },
    "network": {
        "transport": "http"
    },
    "source": {
        "ip": "10.24.25.21",
        "address": "10.24.25.21"
    },
    "related": {
        "ip": [
            "10.24.25.21"
        ]
    }
}

{
    "message": "%ASA-7-199019: Mar  6 21:58:53 Ipc[1234]: func return 1#012",
    "event": {
        "code": "199019",
        "kind": "event",
        "category": [
            "network"
        ],
        "action": "return 1#012"
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic"
    },
    "host": {
        "name": "func"
    },
    "process": {
        "pid": 1234,
        "name": "Ipc"
    }
}

{
    "message": "%ASA-6-302013: Built inbound TCP connection 1800234408 for TTA-ACME-VDO_CAM:10.1.7.248/40454 (10.1.7.248/40454) to TTA-ACME-SRV_INFRA:10.1.0.10/53 (10.1.0.10/53)",
    "event": {
        "code": "302013",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "built"
    },
    "destination": {
        "ip": "10.1.0.10",
        "nat": {
            "ip": "10.1.0.10",
            "port": 53
        },
        "port": 53,
        "address": "10.1.0.10"
    },
    "network": {
        "direction": "inbound",
        "transport": "tcp"
    },
    "source": {
        "ip": "10.1.7.248",
        "port": 40454,
        "nat": {
            "ip": "10.1.7.248",
            "port": 40454
        },
        "address": "10.1.7.248"
    },
    "related": {
        "ip": [
            "10.1.0.10",
            "10.1.7.248"
        ]
    }
}

{
    "message": "%ASA-6-302014: Teardown TCP connection 3642851852 for outside:9.27.0.93/63677 to Pika:172.17.1.200/443 duration 0:10:06 bytes 4666 FIN Timeout from Pika",
    "event": {
        "code": "302014",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "teardown"
    },
    "destination": {
        "ip": "172.17.1.200",
        "port": 443,
        "address": "172.17.1.200"
    },
    "network": {
        "bytes": 4666,
        "transport": "tcp"
    },
    "source": {
        "ip": "9.27.0.93",
        "port": 63677,
        "address": "9.27.0.93"
    },
    "related": {
        "ip": [
            "172.17.1.200",
            "9.27.0.93"
        ]
    }
}

{
    "message": "%ASA-6-302020: Built inbound ICMP connection for faddr 47.241.116.84/10800 gaddr 10.11.0.2/0 laddr 10.11.0.2/0",
    "event": {
        "code": "302020",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "built"
    },
    "destination": {
        "ip": "47.241.116.84",
        "port": 10800,
        "address": "47.241.116.84"
    },
    "network": {
        "direction": "inbound",
        "transport": "icmp"
    },
    "source": {
        "ip": "10.11.0.2",
        "address": "10.11.0.2"
    },
    "related": {
        "ip": [
            "10.11.0.2",
            "47.241.116.84"
        ]
    }
}

{
    "message": "%ASA-6-302020: Built inbound ICMP connection for faddr 1.2.3.4/1(LOCAL\\USER) gaddr 1.2.3.5/0 laddr 1.2.3.5/0 (USER) type 8 code 0",
    "event": {
        "code": "302020",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "built"
    },
    "cisco": {
        "ftd": {
            "icmp_code": "0",
            "icmp_type": "8"
        }
    },
    "destination": {
        "ip": "1.2.3.4",
        "port": 1,
        "address": "1.2.3.4"
    },
    "network": {
        "direction": "inbound",
        "transport": "icmp"
    },
    "source": {
        "ip": "1.2.3.5",
        "address": "1.2.3.5"
    },
    "user": {
        "domain": "LOCAL",
        "name": "USER"
    },
    "related": {
        "ip": [
            "1.2.3.4",
            "1.2.3.5"
        ],
        "user": [
            "USER"
        ]
    }
}

{
    "message": "%ASA-6-302021: Teardown ICMP connection for faddr 172.16.10.208/2189 gaddr 172.16.19.90/0 laddr 172.16.19.90/0 (karibou)",
    "event": {
        "code": "302021",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "teardown"
    },
    "destination": {
        "ip": "172.16.10.208",
        "port": 2189,
        "address": "172.16.10.208"
    },
    "network": {
        "transport": "icmp"
    },
    "source": {
        "ip": "172.16.19.90",
        "address": "172.16.19.90"
    },
    "user": {
        "name": "karibou"
    },
    "related": {
        "ip": [
            "172.16.10.208",
            "172.16.19.90"
        ],
        "user": [
            "karibou"
        ]
    }
}

{
    "message": "%ASA-6-302021: Teardown ICMP connection for faddr 1.2.3.4/25481 gaddr 1.2.4.3/0 laddr 1.2.4.3/0 type 8 code 0",
    "event": {
        "code": "302021",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "teardown"
    },
    "cisco": {
        "ftd": {
            "icmp_code": "0",
            "icmp_type": "8"
        }
    },
    "destination": {
        "ip": "1.2.3.4",
        "port": 25481,
        "address": "1.2.3.4"
    },
    "network": {
        "transport": "icmp"
    },
    "source": {
        "ip": "1.2.4.3",
        "address": "1.2.4.3"
    },
    "related": {
        "ip": [
            "1.2.3.4",
            "1.2.4.3"
        ]
    }
}

{
    "message": "%ASA-6-305011: Built dynamic TCP translation from interco_pa_asa:10.79.16.23/35928 to dmz-gce:126.189.129.55/35928",
    "event": {
        "code": "305011",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "built"
    },
    "destination": {
        "ip": "126.189.129.55",
        "port": 35928,
        "address": "126.189.129.55"
    },
    "network": {
        "transport": "tcp"
    },
    "source": {
        "ip": "10.79.16.23",
        "port": 35928,
        "address": "10.79.16.23"
    },
    "related": {
        "ip": [
            "10.79.16.23",
            "126.189.129.55"
        ]
    }
}

{
    "message": "%ASA-6-305012: Teardown dynamic TCP translation from interco_asa:10.79.16.24/55924 to dmz:12.18.129.56/55924 duration 0:00:15",
    "event": {
        "code": "305012",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "teardown"
    },
    "destination": {
        "ip": "12.18.129.56",
        "port": 55924,
        "address": "12.18.129.56"
    },
    "network": {
        "transport": "tcp"
    },
    "source": {
        "ip": "10.79.16.24",
        "port": 55924,
        "address": "10.79.16.24"
    },
    "related": {
        "ip": [
            "10.79.16.24",
            "12.18.129.56"
        ]
    }
}

{
    "message": "%ASA-4-313005: No matching connection for ICMP error message: icmp src outside:1.2.3.4(LOCAL\\a.smithee) dst inside:1.4.3.2 (type 3, code 3) on outside interface.  Original IP payload: udp src 1.4.3.2/53 dst 1.2.3.4/60717.",
    "event": {
        "code": "313005",
        "kind": "event",
        "category": [
            "network"
        ],
        "reason": "icmp"
    },
    "observer": {
        "vendor": "Cisco",
        "ingress": {
            "interface": {
                "alias": "outside"
            }
        },
        "egress": {
            "interface": {
                "alias": "inside"
            }
        },
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "no matching connection"
    },
    "cisco": {
        "ftd": {
            "icmp_code": "3",
            "icmp_type": "3"
        }
    },
    "destination": {
        "ip": "1.4.3.2",
        "address": "1.4.3.2"
    },
    "network": {
        "transport": "icmp"
    },
    "source": {
        "ip": "1.2.3.4",
        "address": "1.2.3.4"
    },
    "user": {
        "domain": "LOCAL",
        "name": "a.smithee"
    },
    "related": {
        "ip": [
            "1.2.3.4",
            "1.4.3.2"
        ],
        "user": [
            "a.smithee"
        ]
    }
}

{
    "message": "%ASA-3-313008: Denied IPv6-ICMP type=136, code=0 from fe80::f037:5fbc:b824:230d on interface NEA-FOR-WIFOR",
    "event": {
        "code": "313008",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "denied"
    },
    "cisco": {
        "ftd": {
            "icmp_code": "0",
            "icmp_type": "136"
        }
    },
    "network": {
        "transport": "ipv6-icmp"
    },
    "source": {
        "ip": "fe80::f037:5fbc:b824:230d",
        "address": "fe80::f037:5fbc:b824:230d"
    },
    "related": {
        "ip": [
            "fe80::f037:5fbc:b824:230d"
        ]
    }
}

{
    "message": "%ASA-7-609002: Teardown local-host outside:1.2.3.4 duration 0:10:26",
    "event": {
        "code": "609002",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "ingress": {
            "interface": {
                "alias": "outside"
            }
        },
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "teardown"
    },
    "cisco": {
        "ftd": {
            "event": {
                "duration": "0:10:26"
            }
        }
    },
    "source": {
        "ip": "1.2.3.4",
        "address": "1.2.3.4"
    },
    "related": {
        "ip": [
            "1.2.3.4"
        ]
    }
}

{
    "message": "%ASA-6-716058: Group <CLIENT_VPN> User <Acme_account> IP <86.199.78.204> AnyConnect session lost connection. Waiting to resume.",
    "event": {
        "code": "716058",
        "kind": "event",
        "category": [
            "network"
        ],
        "type": [
            "connection"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "anyconnect session lost connection"
    },
    "source": {
        "ip": "86.199.78.204",
        "address": "86.199.78.204"
    },
    "user": {
        "domain": "CLIENT_VPN",
        "name": "Acme_account"
    },
    "related": {
        "ip": [
            "86.199.78.204"
        ],
        "user": [
            "Acme_account"
        ]
    }
}

{
    "message": "%ASA-6-716059: Group <CLIENT_VPN> User <User_Acme> IP <10.17.100.175> AnyConnect session resumed connection from IP <10.17.100.175>.",
    "event": {
        "code": "716059",
        "kind": "event",
        "category": [
            "network"
        ],
        "type": [
            "connection"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "anyconnect session resumed"
    },
    "source": {
        "ip": "10.17.100.175",
        "address": "10.17.100.175"
    },
    "user": {
        "domain": "CLIENT_VPN",
        "name": "User_Acme"
    },
    "related": {
        "ip": [
            "10.17.100.175"
        ],
        "user": [
            "User_Acme"
        ]
    }
}

{
    "message": "%ASA-5-722011: Group <GroupPolicy_CLIENT_VPN> User <User_acme> IP <91.172.139.4> SVC Message: 17/WARNING: Reconnecting the VPN tunnel..",
    "event": {
        "code": "722011",
        "kind": "event",
        "category": [
            "network"
        ],
        "type": [
            "connection"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "reconnecting the vpn tunnel.."
    },
    "source": {
        "ip": "91.172.139.4",
        "address": "91.172.139.4"
    },
    "user": {
        "domain": "GroupPolicy_CLIENT_VPN",
        "name": "User_acme"
    },
    "related": {
        "ip": [
            "91.172.139.4"
        ],
        "user": [
            "User_acme"
        ]
    }
}

{
    "message": "%ASA-5-722012: Group <GroupPolicy_CLIENT_VPN> User <User_Acme> IP <86.217.237.163> SVC Message: 16/NOTICE: Client PC is going into suspend mode (Sleep, Hibernate, etc)..",
    "event": {
        "code": "722012",
        "kind": "event",
        "category": [
            "network"
        ],
        "type": [
            "connection"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "client pc is going into suspend mode (sleep, hibernate, etc).."
    },
    "source": {
        "ip": "86.217.237.163",
        "address": "86.217.237.163"
    },
    "user": {
        "domain": "GroupPolicy_CLIENT_VPN",
        "name": "User_Acme"
    },
    "related": {
        "ip": [
            "86.217.237.163"
        ],
        "user": [
            "User_Acme"
        ]
    }
}

{
    "message": "%ASA-6-722023: Group <GroupPolicy_CLIENT_VPN> User <User_Acme> IP <86.215.190.93> TCP SVC connection terminated without compression",
    "event": {
        "code": "722023",
        "kind": "event",
        "category": [
            "network"
        ],
        "type": [
            "connection"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "svc connection terminated"
    },
    "source": {
        "ip": "86.215.190.93",
        "address": "86.215.190.93"
    },
    "user": {
        "domain": "GroupPolicy_CLIENT_VPN",
        "name": "User_Acme"
    },
    "related": {
        "ip": [
            "86.215.190.93"
        ],
        "user": [
            "User_Acme"
        ]
    }
}

{
    "message": "%ASA-6-722023: Group <GroupPolicy-CLIENT-VPN> User <a.smithee> IP <1.2.3.4> UDP SVC connection terminated without compression",
    "event": {
        "code": "722023",
        "kind": "event",
        "category": [
            "network"
        ],
        "type": [
            "connection"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "svc connection terminated"
    },
    "source": {
        "ip": "1.2.3.4",
        "address": "1.2.3.4"
    },
    "user": {
        "domain": "GroupPolicy-CLIENT-VPN",
        "name": "a.smithee"
    },
    "related": {
        "ip": [
            "1.2.3.4"
        ],
        "user": [
            "a.smithee"
        ]
    }
}

{
    "message": "%ASA-5-722028: Group <GroupPolicy_CLIENT_VPN> User <User_Acme> IP <91.172.139.4> Stale SVC connection closed.",
    "event": {
        "code": "722028",
        "kind": "event",
        "category": [
            "network"
        ],
        "type": [
            "connection"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "connection closed."
    },
    "source": {
        "ip": "91.172.139.4",
        "address": "91.172.139.4"
    },
    "user": {
        "domain": "GroupPolicy_CLIENT_VPN",
        "name": "User_Acme"
    },
    "related": {
        "ip": [
            "91.172.139.4"
        ],
        "user": [
            "User_Acme"
        ]
    }
}

{
    "message": "%ASA-5-722032: Group <GroupPolicy_CLIENT_VPN> User <User_Acme> IP <93.23.18.76> New UDP SVC connection replacing old connection.",
    "event": {
        "code": "722032",
        "kind": "event",
        "category": [
            "network"
        ],
        "type": [
            "connection"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "connection replacing old connection."
    },
    "source": {
        "ip": "93.23.18.76",
        "address": "93.23.18.76"
    },
    "user": {
        "domain": "GroupPolicy_CLIENT_VPN",
        "name": "User_Acme"
    },
    "related": {
        "ip": [
            "93.23.18.76"
        ],
        "user": [
            "User_Acme"
        ]
    }
}

{
    "message": "%ASA-5-722033: Group <GroupPolicy_CLIENT_VPN> User <User_Acme> IP <77.205.143.138> First TCP SVC connection established for SVC session.",
    "event": {
        "code": "722033",
        "kind": "event",
        "category": [
            "network"
        ],
        "type": [
            "connection"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "connection established for svc session."
    },
    "source": {
        "ip": "77.205.143.138",
        "address": "77.205.143.138"
    },
    "user": {
        "domain": "GroupPolicy_CLIENT_VPN",
        "name": "User_Acme"
    },
    "related": {
        "ip": [
            "77.205.143.138"
        ],
        "user": [
            "User_Acme"
        ]
    }
}

{
    "message": "%ASA-5-722034: Group <GroupPolicy_CLIENT_VPN> User <User_Acme> IP <109.17.100.175> New TCP SVC connection, no existing connection.",
    "event": {
        "code": "722034",
        "kind": "event",
        "category": [
            "network"
        ],
        "type": [
            "connection"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "connection, no existing connection."
    },
    "source": {
        "ip": "109.17.100.175",
        "address": "109.17.100.175"
    },
    "user": {
        "domain": "GroupPolicy_CLIENT_VPN",
        "name": "User_Acme"
    },
    "related": {
        "ip": [
            "109.17.100.175"
        ],
        "user": [
            "User_Acme"
        ]
    }
}

{
    "message": "%ASA-4-722037: Group <GroupPolicy_CLIENT_VPN> User <User_Acme> IP <92.131.212.102> SVC closing connection: Transport closing.",
    "event": {
        "code": "722037",
        "kind": "event",
        "category": [
            "network"
        ],
        "reason": "Transport closing",
        "type": [
            "connection"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "closing connection"
    },
    "source": {
        "ip": "92.131.212.102",
        "address": "92.131.212.102"
    },
    "user": {
        "domain": "GroupPolicy_CLIENT_VPN",
        "name": "User_Acme"
    },
    "related": {
        "ip": [
            "92.131.212.102"
        ],
        "user": [
            "User_Acme"
        ]
    }
}

{
    "message": "%ASA-6-725001: Starting SSL handshake with client WAN:195.101.173.60/49238 for TLS session.",
    "event": {
        "code": "725001",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "starting ssl handshake"
    },
    "source": {
        "ip": "195.101.173.60",
        "port": 49238,
        "address": "195.101.173.60"
    },
    "related": {
        "ip": [
            "195.101.173.60"
        ]
    }
}

{
    "message": "%ASA-6-725002: Device completed SSL handshake with client WAN:90.114.208.186/65531",
    "event": {
        "code": "725002",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "device completed ssl handshake"
    },
    "source": {
        "ip": "90.114.208.186",
        "port": 65531,
        "address": "90.114.208.186"
    },
    "related": {
        "ip": [
            "90.114.208.186"
        ]
    }
}

{
    "message": "%ASA-6-725006: Device failed SSL handshake with client WAN:195.101.173.60/49699",
    "event": {
        "code": "725006",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "device failed ssl handshake"
    },
    "source": {
        "ip": "195.101.173.60",
        "port": 49699,
        "address": "195.101.173.60"
    },
    "related": {
        "ip": [
            "195.101.173.60"
        ]
    }
}

{
    "message": "<166>Nov 09 2022 10:01:59: %ASA-6-725007: SSL session with client WAN:195.101.173.60/49486 terminated.",
    "event": {
        "code": "725007",
        "kind": "event",
        "category": [
            "network"
        ],
        "reason": "terminated"
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "ssl session"
    },
    "source": {
        "ip": "195.101.173.60",
        "port": 49486,
        "address": "195.101.173.60"
    },
    "related": {
        "ip": [
            "195.101.173.60"
        ]
    }
}

{
    "message": "%ASA-4-733100: [scanning] drop rate-1 exceeded. Current burst rate is 8 per second, max configured rate is 10; Current average rate is 23 per second, max configured rate is 5; Cumulative total count is 14188",
    "event": {
        "code": "733100",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "scanning"
    }
}

{
    "message": "%ASA-6-737016: IPAA: Freeing local pool address 192.168.122.247",
    "event": {
        "code": "737016",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Adaptive Security Appliance"
    },
    "action": {
        "target": "network-traffic",
        "name": "freeing local pool address"
    },
    "source": {
        "ip": "192.168.122.247",
        "address": "192.168.122.247"
    },
    "related": {
        "ip": [
            "192.168.122.247"
        ]
    }
}

{
    "message": "%FTD-6-852001: Received Lightweight to full proxy event from application Snort for TCP flow 1.2.3.4/10000 to 4.3.2.1/47003",
    "event": {
        "code": "852001",
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Firepower Threat Defense"
    },
    "action": {
        "target": "network-traffic"
    },
    "destination": {
        "ip": "4.3.2.1",
        "port": 47003,
        "address": "4.3.2.1"
    },
    "network": {
        "transport": "tcp",
        "application": "Snort"
    },
    "source": {
        "ip": "1.2.3.4",
        "port": 10000,
        "address": "1.2.3.4"
    },
    "related": {
        "ip": [
            "1.2.3.4",
            "4.3.2.1"
        ]
    }
}

{
    "message": "%FTD-1-430002: EventPriority: Low, DeviceUUID: 1662dc94-665c-4e50-97df-1c5b281556aa, InstanceID: 3, FirstPacketSecond: 2023-07-27T08:13:09Z, ConnectionID: 62230, AccessControlRuleAction: Allow, SrcIP: 1.2.3.4, DstIP: 5.6.7.8, SrcPort: 63853, DstPort: 443, Protocol: tcp, IngressInterface: WAN, EgressInterface: DMZ, IngressZone: OUT, EgressZone: DMZ, IngressVRF: Global, EgressVRF: Global, ACPolicy: ACPolicy, AccessControlRuleName: IN_KEMP_MAIL, Prefilter Policy: EXAMPLE L3-L4 Policy, InitiatorPackets: 2, ResponderPackets: 1, InitiatorBytes: 128, ResponderBytes: 66, NAPPolicy: Balanced Security and Connectivity",
    "event": {
        "code": "430002",
        "kind": "event",
        "category": [
            "network"
        ],
        "action": "connection-started",
        "type": [
            "connection",
            "start"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Firepower Threat Defense"
    },
    "action": {
        "target": "network-traffic"
    },
    "destination": {
        "bytes": 66,
        "ip": "5.6.7.8",
        "packets": 1,
        "port": 443,
        "address": "5.6.7.8"
    },
    "log": {
        "level": "Low"
    },
    "network": {
        "transport": "tcp"
    },
    "rule": {
        "name": "IN_KEMP_MAIL",
        "ruleset": "ACPolicy"
    },
    "source": {
        "bytes": 128,
        "ip": "1.2.3.4",
        "packets": 2,
        "port": 63853,
        "address": "1.2.3.4"
    },
    "related": {
        "ip": [
            "1.2.3.4",
            "5.6.7.8"
        ]
    }
}

{
    "message": "%FTD-1-430003: EventPriority: Low, DeviceUUID: 1662dc94-665c-4e50-97df-1c5b281556aa, InstanceID: 5, FirstPacketSecond: 2023-07-27T08:13:09Z, ConnectionID: 35868, AccessControlRuleAction: Allow, SrcIP: 1.2.3.4, DstIP: 5.6.7.8, SrcPort: 56901, DstPort: 53, Protocol: udp, IngressInterface: LAN, EgressInterface: WAN, IngressZone: LAN, EgressZone: OUT, IngressVRF: Global, EgressVRF: Global, ACPolicy: ACPolicy, AccessControlRuleName: SORTIE_SRVAD_DNS_OUT, Prefilter Policy: EXAMPLE L3-L4 Policy, User: Not Found, Client: DNS client, ApplicationProtocol: DNS, ConnectionDuration: 0, InitiatorPackets: 1, ResponderPackets: 1, InitiatorBytes: 88, ResponderBytes: 152, NAPPolicy: Balanced Security and Connectivity, DNSQuery: 1.fr.pool.ntp.org, DNSRecordType: a host address, DNSResponseType: No Error, DNS_TTL: 150, NAT_InitiatorPort: 22294, NAT_ResponderPort: 53, NAT_InitiatorIP: 4.3.2.1, NAT_ResponderIP: 8.7.6.5",
    "event": {
        "code": "430003",
        "kind": "event",
        "category": [
            "network"
        ],
        "action": "connection-finished",
        "type": [
            "connection",
            "end"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Firepower Threat Defense"
    },
    "action": {
        "target": "network-traffic"
    },
    "destination": {
        "bytes": 152,
        "ip": "5.6.7.8",
        "packets": 1,
        "port": 53,
        "address": "5.6.7.8"
    },
    "dns": {
        "question": {
            "name": "1.fr.pool.ntp.org",
            "top_level_domain": "org",
            "subdomain": "1.fr.pool",
            "registered_domain": "ntp.org"
        },
        "response_code": "No Error"
    },
    "cisco": {
        "dns": {
            "record_type": "a host address",
            "ttl": "150"
        }
    },
    "log": {
        "level": "Low"
    },
    "network": {
        "application": "dns client",
        "protocol": "DNS",
        "transport": "udp"
    },
    "rule": {
        "name": "SORTIE_SRVAD_DNS_OUT",
        "ruleset": "ACPolicy"
    },
    "source": {
        "bytes": 88,
        "ip": "1.2.3.4",
        "packets": 1,
        "port": 56901,
        "address": "1.2.3.4"
    },
    "user": {
        "name": "Not Found"
    },
    "related": {
        "ip": [
            "1.2.3.4",
            "5.6.7.8"
        ],
        "user": [
            "Not Found"
        ],
        "hosts": [
            "1.fr.pool.ntp.org"
        ]
    }
}

{
    "message": "%FTD-1-430003: EventPriority: Low, DeviceUUID: 1662dc94-665c-4e50-97df-1c5b281556aa, InstanceID: 5, FirstPacketSecond: 2023-07-27T08:13:09Z, ConnectionID: 35871, AccessControlRuleAction: Allow, SrcIP: 1.2.3.4, DstIP: 5.6.7.8, SrcPort: 50158, DstPort: 443, Protocol: tcp, IngressInterface: LAN, EgressInterface: WAN, IngressZone: LAN, EgressZone: OUT, IngressVRF: Global, EgressVRF: Global, ACPolicy: ACPolicy, AccessControlRuleName: SORTIE_INTERNET_ALL, Prefilter Policy: EXAMPLE L3-L4 Policy, User: Not Found, Client: SSL client, ApplicationProtocol: HTTPS, WebApplication: Trend Micro, ConnectionDuration: 0, InitiatorPackets: 10, ResponderPackets: 13, InitiatorBytes: 967, ResponderBytes: 5018, NAPPolicy: Balanced Security and Connectivity, SSLPolicy: None, SSLFlowStatus: Success, SSLCipherSuite: Unknown, SSLCertificate: 3ccc5ece59e81d905ed314c1e9af0f797393fec5, SSLVersion: Unknown, SSLServerCertStatus: Valid, SSLActualAction: Do Not Decrypt, SSLExpectedAction: Do Not Decrypt, SSLServerName: example.org, URLCategory: Computer Security, URLReputation: Trusted, URL: https://example.org, NAT_InitiatorPort: 36170, NAT_ResponderPort: 443, NAT_InitiatorIP: 4.3.2.1, NAT_ResponderIP: 8.7.6.5",
    "event": {
        "code": "430003",
        "kind": "event",
        "category": [
            "network"
        ],
        "action": "connection-finished",
        "type": [
            "connection",
            "end"
        ]
    },
    "observer": {
        "vendor": "Cisco",
        "product": "Firepower Threat Defense"
    },
    "action": {
        "target": "network-traffic"
    },
    "destination": {
        "bytes": 5018,
        "ip": "5.6.7.8",
        "packets": 13,
        "port": 443,
        "address": "5.6.7.8"
    },
    "url": {
        "original": "https://example.org",
        "domain": "example.org",
        "top_level_domain": "org",
        "registered_domain": "example.org",
        "scheme": "https",
        "port": 443
    },
    "log": {
        "level": "Low"
    },
    "network": {
        "application": "ssl client",
        "protocol": "HTTPS",
        "transport": "tcp"
    },
    "rule": {
        "name": "SORTIE_INTERNET_ALL",
        "ruleset": "ACPolicy"
    },
    "source": {
        "bytes": 967,
        "ip": "1.2.3.4",
        "packets": 10,
        "port": 50158,
        "address": "1.2.3.4"
    },
    "user": {
        "name": "Not Found"
    },
    "related": {
        "ip": [
            "1.2.3.4",
            "5.6.7.8"
        ],
        "user": [
            "Not Found"
        ]
    }
}

{
    "message": "Group <AnyConnect-SESAME> User <JD34242243> IP <1.2.3.4> AnyConnect session lost connection. Waiting to resume.",
    "event": {
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco"
    },
    "action": {
        "target": "network-traffic",
        "name": "anyconnect session lost connection"
    },
    "user": {
        "domain": "AnyConnect-SESAME",
        "name": "JD34242243"
    },
    "source": {
        "ip": "1.2.3.4",
        "address": "1.2.3.4"
    },
    "related": {
        "ip": [
            "1.2.3.4"
        ],
        "user": [
            "JD34242243"
        ]
    }
}

{
    "message": "Group <MYGROUP> User <JD34242243> IP <1.2.3.4> SVC closing connection: DPD failure.",
    "event": {
        "kind": "event",
        "category": [
            "network"
        ],
        "reason": "DPD failure"
    },
    "observer": {
        "vendor": "Cisco"
    },
    "action": {
        "target": "network-traffic"
    },
    "user": {
        "domain": "MYGROUP",
        "name": "JD34242243"
    },
    "source": {
        "ip": "1.2.3.4",
        "address": "1.2.3.4"
    },
    "related": {
        "ip": [
            "1.2.3.4"
        ],
        "user": [
            "JD34242243"
        ]
    }
}

{
    "message": "Group = MYGROUP, Username = JD34242243, IP = 1.2.3.4, Session disconnected. Session Type: SSL, Duration: 6h:33m:18s, Bytes xmt: 220870890, Bytes rcv: 57125392, Reason: Idle Timeout",
    "event": {
        "kind": "event",
        "category": [
            "network"
        ],
        "reason": "Idle Timeout"
    },
    "observer": {
        "vendor": "Cisco"
    },
    "action": {
        "target": "network-traffic"
    },
    "user": {
        "domain": "MYGROUP",
        "name": "JD34242243"
    },
    "source": {
        "ip": "1.2.3.4",
        "address": "1.2.3.4"
    },
    "related": {
        "ip": [
            "1.2.3.4"
        ],
        "user": [
            "JD34242243"
        ]
    }
}

{
    "message": "Task ran for 109 msec, Process = aaa_shim_thread, PC = ade9333c, Call stack =   0x000000aaabb34820  0x000000aaabb2429c  0x000000aaabb24218",
    "event": {
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco"
    },
    "action": {
        "target": "network-traffic"
    },
    "cisco": {
        "ftd": {
            "event": {
                "duration": "109"
            }
        }
    },
    "host": {
        "name": "ade9333c"
    }
}

{
    "message": "TunnelGroup <AnyConnect-SESAME> GroupPolicy <MYGROUP> User <JD34242243> IP <1.2.3.4> No IPv6 address available for SVC connection",
    "event": {
        "kind": "event",
        "category": [
            "network"
        ]
    },
    "observer": {
        "vendor": "Cisco"
    },
    "action": {
        "target": "network-traffic"
    },
    "user": {
        "domain": "AnyConnect-SESAME",
        "name": "JD34242243"
    },
    "source": {
        "ip": "1.2.3.4",
        "address": "1.2.3.4"
    },
    "related": {
        "ip": [
            "1.2.3.4"
        ],
        "user": [
            "JD34242243"
        ]
    }
}

Extracted Fields

The following table lists the fields that are extracted, normalized under the ECS format, analyzed and indexed by the parser. It should be noted that infered fields are not listed.

Name Type Description
@timestamp date Date/time when the event originated.
action.target keyword The target of the action. This field is mandatory for STIX2 compliance
cisco.dns.record_type keyword Cisco record type returned for the DNS query
cisco.dns.ttl keyword Cisco ttl returned for the DNS query
cisco.ftd.event.duration keyword Cisco FTD event duration
cisco.ftd.file_sandbox_status keyword The descriptive name for the filelog sandbox status.
cisco.ftd.file_storage_status keyword The storage status of the file associated with the event
cisco.ftd.icmp_code keyword The ICMP code used by the session responder.
cisco.ftd.icmp_type keyword The ICMP type used by the session initiator.
cisco.ftd.sha_disposition keyword Sha disposition
cisco.ftd.spero_disposition keyword The descriptive name for the filelog spero status.
destination.bytes long Bytes sent from the destination to the source.
destination.domain keyword The domain name of the destination.
destination.ip ip IP address of the destination.
destination.nat.ip ip Destination NAT ip
destination.nat.port long Destination NAT Port
destination.packets long Packets sent from the destination to the source.
destination.port long Port of the destination.
dns.question.name keyword The name being queried.
dns.response_code keyword The DNS response code.
event.action keyword The action captured by the event.
event.category keyword Event category. The second categorization field in the hierarchy.
event.code keyword Identification code for this event.
event.kind keyword The kind of the event. The highest categorization field in the hierarchy.
event.reason keyword Reason why this event happened, according to the source
event.type keyword Event type. The third categorization field in the hierarchy.
file.extension keyword File extension, excluding the leading dot.
file.hash.sha256 keyword SHA256 hash.
file.name keyword Name of the file including the extension, without the directory.
file.size long File size in bytes.
host.hostname keyword Hostname of the host.
host.ip ip Host ip addresses.
host.name keyword Name of the host.
http.request.bytes long Total size in bytes of the request (body and headers).
http.request.method keyword HTTP request method.
http.request.mime_type keyword Mime type of the body of the request.
http.response.bytes long Total size in bytes of the response (body and headers).
http.response.status_code long HTTP response status code.
log.level keyword Log level of the log event.
network.application keyword Application level protocol name.
network.bytes long Total bytes transferred in both directions.
network.direction keyword Direction of the network traffic.
network.protocol keyword Application protocol name.
network.transport keyword Protocol Name corresponding to the field iana_number.
observer.egress.interface.alias keyword Interface alias
observer.hostname keyword Hostname of the observer.
observer.ingress.interface.alias keyword Interface alias
observer.vendor keyword Vendor name of the observer.
process.name keyword Process name.
process.pid long Process id.
rule.category keyword Rule category
rule.name keyword Rule name
rule.ruleset keyword Rule ruleset
source.bytes long Bytes sent from the source to the destination.
source.ip ip IP address of the source.
source.nat.ip ip Source NAT ip
source.nat.port long Source NAT port
source.packets long Packets sent from the source to the destination.
source.port long Port of the source.
threat.software.name keyword Name of the software.
url.original wildcard Unmodified original url as seen in the event source.
url.path wildcard Path of the request, such as "/search".
url.scheme keyword Scheme of the url.
user.domain keyword Name of the directory the user is a member of.
user.name keyword Short name or login of the user.
user_agent.original keyword Unparsed user_agent string.

Configure

CISCO Secure Firewall logs

On CISCO appliances, most of the important hardward and software activities that are relevant for security detection and analysis, are enable by one simple command. To enable logging, enter the following commands:

hostname(config)# logging enable
hostname(config)# logging timestamp
hostname(config)# logging trap informational

Transport to the concentrator

Prerequisites

The following prerequisites are needed in order to setup efficient log concentration:

  • Have administrator privileges on the CISCO appliance
  • Traffic towards the concentrator must be open on UDP 514

Configure the CISCO Appliance

In order to forward the logs to the concentrator, please follow those commands:

Note the interface name 

hostname(config)# show interface

Note the host name 

hostname(config)# show hostname

You then have to configure an output destination for logs. Here, we choose to send syslog messages to an external syslog server. 

hostname(config)# logging host interface_name syslog_ip [ tcp[/ port ] udp [/ port ]

Example: 

hostname(config)# logging host interface_1 127.0.0.1 udp

Explanations:

  • The interface_name argument specifies the interface through which you access the syslog server.
  • The syslog_ip argument specifies the IP address of the syslog server.
  • The tcp[/ port ] or udp[/ port ] keyword and argument pair specify that the ASA and ASASM should use TCP or UDP to send syslog messages to the syslog server.
  • You can configure the ASA to send data to a syslog server using either UDP or TCP, but not both. The default protocol is UDP if you do not specify a protocol.

If you specify TCP, the ASA discovers when the syslog server fails and as a security protection, new connections through the ASA are blocked. If you specify UDP, the ASA continues to allow new connections whether or not the syslog server is operational. Valid port values for either protocol are 1025 through 65535. The default UDP port is 514. The default TCP port is 1470. For more information about Cisco ASA logging, please refer to your Cisco documentation.

Forward logs to Sekoia.io

The reader is invited to consult the Syslog Forwarding documentation to forward these logs to Sekoia.io.