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Auditbeat Linux

Overview

Auditbeat communicates directly with the Linux audit framework, collects the same data as auditd then the data can be stored in JSON inside a log file before being sent to a log concentrator.

Benefit from SEKOIA.IO built-in rules and upgrade AuditBeat Linux with the following detection capabilities out-of-the-box.

SEKOIA.IO x AuditBeat Linux on ATT&CK Navigator

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
Advanced IP Scanner

Detects the use of Advanced IP Scanner. Seems to be a popular tool for ransomware groups.

  • Effort: master
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
Commonly Used Commands To Stop Services And Remove Backups

Detects specific commands used regularly by ransomwares to stop services or remove backups

  • Effort: intermediate
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: advanced
ETW Tampering

Detects a command that clears or disables any ETW Trace log which could indicate a logging evasion

  • Effort: intermediate
Exfiltration Domain In Command Line

Detects commands containing a domain linked to http exfiltration.

  • Effort: intermediate
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
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
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
Lazarus Loaders

Detects different loaders used by the Lazarus Group APT

  • Effort: elementary
MalwareBytes Uninstallation

Detects command line being used by attackers to uninstall Malwarebytes.

  • Effort: intermediate
MavInject Process Injection

Detects process injection using the signed Windows tool Mavinject32.exe (which is a LOLBAS)

  • Effort: intermediate
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
NetSh Used To Disable Windows Firewall

Detects NetSh commands used to disable the Windows Firewall

  • Effort: intermediate
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: elementary
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
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: intermediate
Outlook Registry Access

Detection of accesses to Microsoft Outlook registry hive, which might contain sensitive information.

  • Effort: elementary
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 EncodedCommand

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

  • Effort: advanced
Process Memory Dump Using Comsvcs

Detects the use of comsvcs in command line to dump a specific proces memory. This techinique is widlely used by attackers for privilege escalation and pivot.

  • Effort: elementary
Qakbot Persistence Using Schtasks

Detects possible Qakbot persistence using schtasks.

  • Effort: intermediate
Raccine Uninstall

Detects commands that indicate a Raccine removal from an end system. Raccine is a free ransomware protection tool.

  • Effort: elementary
Rclone Process

Detects Rclone executable or Rclone execution by using the process name, the execution through a command obfuscated or not.

  • Effort: advanced
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
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 Cmd File Copy Command To Network Share

Copy suspicious files through Windows cmd prompt to network share

  • Effort: intermediate
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 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 Network Args In Command Line

Detection on suspicious network arguments in processes command lines using HTTP schema with port 443.

  • Effort: intermediate
Suspicious PowerShell Invocations - Specific

Detects suspicious PowerShell invocation command parameters

  • Effort: intermediate
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
Usage Of Procdump With Common Arguments

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

  • 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
WiFi Credentials Harvesting Using Netsh

Detects the harvesting of WiFi credentials using netsh.exe, used in particular by Agent Tesla (RAT) and Turla Mosquito (RAT)

  • Effort: elementary
Windows Defender History Directory Deleted

Windows Defender history directory has been deleted. Could be an attempt by an attacker to remove its traces.

  • Effort: elementary
Windows Defender 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
Windows Firewall Changes

Detects changes on Windows Firewall configuration

  • Effort: master
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

Event Categories

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

Data Source Description
Authentication logs From system module, login dataset retreive User logins, logouts, and system boots
File monitoring From audit module, the file metricset sends events when a file is changed (created, updated, or deleted) on disk. The events contain file metadata and hashes
Process monitoring From system module, process dataset retreive Started and stopped processes
Process use of network From system module, socket dataset retreive Opened and Closed sockets

Event Samples

Find below few samples of events and how they are normalized by SEKOIA.IO.

{
    "message": "{\"@timestamp\":\"2021-01-01T00:01:01.000Z\",\"@metadata\":{\"beat\":\"auditbeat\",\"type\":\"_doc\",\"version\":\"7.13.0\"},\"event\":{\"module\":\"system\",\"dataset\":\"process\",\"kind\":\"event\",\"category\":[\"process\"],\"type\":[\"end\"],\"action\":\"process_stopped\"},\"process\":{\"working_directory\":\"/my/directory\",\"start\":\"2021-01-01T00:01:01.000Z\",\"name\":\"smtp\",\"entity_id\":\"AZERTY123456789\",\"ppid\":1457,\"executable\":\"/usr/lib/postfix/sbin/smtp\",\"pid\":123123,\"args\":[\"smtp\",\"-t\",\"unix\",\"-u\",\"-c\"],\"hash\":{\"sha1\":\"53fe0c00019fb177e43c7ac214f466f01158384e\"}},\"message\":\"Process smtp (PID: 123123) by user postfix STOPPED\",\"user\":{\"effective\":{\"id\":\"999\",\"group\":{\"id\":\"222\"}},\"saved\":{\"id\":\"999\",\"group\":{\"id\":\"222\"}},\"name\":\"postfix\",\"id\":\"999\",\"group\":{\"id\":\"222\",\"name\":\"postfix\"}},\"service\":{\"type\":\"system\"},\"ecs\":{\"version\":\"1.9.0\"},\"host\":{\"name\":\"fame\"},\"agent\":{\"hostname\":\"fame\",\"ephemeral_id\":\"qsdfghjklm-1111-2222-3333-azertyuiop\",\"id\":\"wxcvbn-010101-121212-4444-azertyuiop\",\"name\":\"fame\",\"type\":\"auditbeat\",\"version\":\"7.13.0\"}}",
    "event": {
        "kind": "event",
        "module": "system",
        "category": [
            "process"
        ],
        "type": [
            "end"
        ],
        "action": "process_stopped"
    },
    "agent": {
        "hostname": "fame",
        "ephemeral_id": "qsdfghjklm-1111-2222-3333-azertyuiop",
        "id": "wxcvbn-010101-121212-4444-azertyuiop",
        "name": "fame",
        "type": "auditbeat",
        "version": "7.13.0"
    },
    "auditbeat": {
        "@metadata": {},
        "event": {},
        "process": {
            "hash": {}
        },
        "message": "Process smtp (PID: 123123) by user postfix STOPPED",
        "user": {
            "effective": {
                "group": {}
            },
            "saved": {
                "group": {}
            },
            "group": {}
        },
        "service": {},
        "ecs": {},
        "host": {},
        "agent": {}
    },
    "auditd": {
        "user": {
            "effective": {
                "group": {}
            },
            "saved": {
                "id": "999",
                "group": {
                    "id": "222"
                }
            },
            "group": {
                "id": "222"
            }
        }
    },
    "host": {
        "name": "fame"
    },
    "log": {
        "hostname": "fame"
    },
    "process": {
        "working_directory": "/my/directory",
        "start": "2021-01-01T00:01:01.000Z",
        "name": "smtp",
        "entity_id": "AZERTY123456789",
        "executable": "/usr/lib/postfix/sbin/smtp",
        "pid": 123123,
        "args": [
            "smtp",
            "-t",
            "unix",
            "-u",
            "-c"
        ],
        "hash": {
            "sha1": "53fe0c00019fb177e43c7ac214f466f01158384e"
        },
        "parent": {
            "pid": 1457
        },
        "command_line": "smtp -t unix -u -c"
    },
    "service": {
        "type": "system"
    },
    "@timestamp": "2021-01-01T00:01:01.000Z",
    "user": {
        "effective": {
            "id": "999",
            "group": {
                "id": "222"
            }
        },
        "saved": {
            "group": {
                "id": "222"
            }
        },
        "name": "postfix",
        "id": "999",
        "group": {
            "id": "222",
            "name": "postfix"
        }
    },
    "related": {
        "hash": [
            "53fe0c00019fb177e43c7ac214f466f01158384e"
        ],
        "user": [
            "postfix"
        ]
    }
}
{
    "message": "{\"@timestamp\":\"2021-11-09T17:39:26.389Z\",\"@metadata\":{\"beat\":\"auditbeat\",\"type\":\"_doc\",\"version\":\"7.15.1\"},\"process\":{\"ppid\":18470,\"title\":\"/opt/google/chrome/chrome --type=zygote --enable-crashpad --crashpad-handler-pid=18479 --enable-crash-reporter=, --change-stack-\",\"name\":\"chrome\",\"executable\":\"/opt/google/chrome/chrome\",\"working_directory\":\"/home/housetodd\",\"pid\":18488},\"auditd\":{\"session\":\"3\",\"summary\":{\"actor\":{\"primary\":\"housetodd\",\"secondary\":\"housetodd\"},\"object\":{\"primary\":\"/proc/1/oom_score_adj\",\"type\":\"file\"},\"how\":\"/opt/google/chrome/chrome\"},\"paths\":[{\"cap_fe\":\"0\",\"cap_fver\":\"0\",\"inode\":\"16064\",\"name\":\"/proc/1/\",\"ogid\":\"0\",\"ouid\":\"0\",\"rdev\":\"00:00\",\"cap_fi\":\"0000000000000000\",\"cap_fp\":\"0000000000000000\",\"dev\":\"00:04\",\"item\":\"0\",\"mode\":\"040555\",\"nametype\":\"PARENT\"},{\"nametype\":\"NORMAL\",\"ogid\":\"0\",\"ouid\":\"0\",\"cap_fe\":\"0\",\"dev\":\"00:04\",\"item\":\"1\",\"mode\":\"0100644\",\"name\":\"/proc/1/oom_score_adj\",\"rdev\":\"00:00\",\"cap_fi\":\"0000000000000000\",\"cap_fp\":\"0000000000000000\",\"cap_fver\":\"0\",\"inode\":\"25973\"}],\"message_type\":\"syscall\",\"sequence\":9052,\"result\":\"fail\",\"data\":{\"tty\":\"(none)\",\"exit\":\"EACCES\",\"a0\":\"7ffc1bfcdfa0\",\"a3\":\"7ffc1bfcde00\",\"a2\":\"55881de610b8\",\"a1\":\"1b6\",\"arch\":\"x86_64\",\"syscall\":\"creat\"}},\"event\":{\"module\":\"auditd\",\"category\":[\"file\"],\"action\":\"opened-file\",\"outcome\":\"failure\",\"kind\":\"event\",\"type\":[\"creation\"]},\"user\":{\"filesystem\":{\"id\":\"5511617b-5ca7-4dd5-bb80-d8590dff4430\",\"group\":{\"id\":\"5511617b-5ca7-4dd5-bb80-d8590dff4430\",\"name\":\"housetodd\"},\"name\":\"housetodd\"},\"name\":\"housetodd\",\"audit\":{\"id\":\"5511617b-5ca7-4dd5-bb80-d8590dff4430\",\"name\":\"housetodd\"},\"saved\":{\"group\":{\"id\":\"5511617b-5ca7-4dd5-bb80-d8590dff4430\",\"name\":\"housetodd\"},\"id\":\"5511617b-5ca7-4dd5-bb80-d8590dff4430\",\"name\":\"housetodd\"},\"group\":{\"id\":\"5511617b-5ca7-4dd5-bb80-d8590dff4430\",\"name\":\"housetodd\"},\"id\":\"5511617b-5ca7-4dd5-bb80-d8590dff4430\"},\"host\":{\"name\":\"xps-housetodd\",\"ip\":[\"144.1.237.149\"],\"mac\":[\"22:69:ae:27:fe:66\"],\"hostname\":\"xps-housetodd\",\"architecture\":\"x86_64\",\"os\":{\"family\":\"debian\",\"name\":\"Ubuntu\",\"kernel\":\"4.15.0-161-generic\",\"codename\":\"bionic\",\"type\":\"linux\",\"platform\":\"ubuntu\",\"version\":\"18.04.6 LTS (Bionic Beaver)\"},\"id\":\"7dd912136af040e4a6ea4f683010b824\",\"containerized\":false},\"file\":{\"gid\":\"0\",\"owner\":\"housetodd\",\"group\":\"housetodd\",\"path\":\"/proc/1/oom_score_adj\",\"device\":\"00:00\",\"inode\":\"25973\",\"mode\":\"0644\",\"uid\":\"0\"},\"tags\":[\"access\"],\"service\":{\"type\":\"auditd\"},\"ecs\":{\"version\":\"1.11.0\"},\"agent\":{\"version\":\"7.15.1\",\"hostname\":\"xps-housetodd\",\"ephemeral_id\":\"f1ac5b09-4f0c-42cf-b9f7-f854eeae073a\",\"id\":\"e9872892-b999-4ad5-83da-d6ec9dbc1f81\",\"name\":\"xps-housetodd\",\"type\":\"auditbeat\"}}",
    "event": {
        "kind": "event",
        "module": "auditd",
        "category": [
            "file"
        ],
        "type": [
            "creation"
        ],
        "action": "opened-file"
    },
    "agent": {
        "version": "7.15.1",
        "hostname": "xps-housetodd",
        "ephemeral_id": "f1ac5b09-4f0c-42cf-b9f7-f854eeae073a",
        "id": "e9872892-b999-4ad5-83da-d6ec9dbc1f81",
        "name": "xps-housetodd",
        "type": "auditbeat"
    },
    "auditbeat": {
        "@metadata": {},
        "process": {},
        "auditd": {
            "summary": {
                "actor": {},
                "object": {}
            },
            "paths": [
                {},
                {}
            ],
            "data": {}
        },
        "event": {},
        "user": {
            "filesystem": {
                "group": {}
            },
            "audit": {},
            "saved": {
                "group": {}
            },
            "group": {}
        },
        "host": {
            "os": {}
        },
        "file": {},
        "tags": [
            "access"
        ],
        "service": {},
        "ecs": {},
        "agent": {}
    },
    "auditd": {
        "session": "3",
        "summary": {
            "actor": {
                "primary": "housetodd",
                "secondary": "housetodd"
            },
            "object": {
                "primary": "/proc/1/oom_score_adj",
                "type": "file"
            },
            "how": "/opt/google/chrome/chrome"
        },
        "paths": [
            {
                "cap_fe": "0",
                "cap_fver": "0",
                "inode": "16064",
                "name": "/proc/1/",
                "ogid": "0",
                "ouid": "0",
                "rdev": "00:00",
                "cap_fi": "0000000000000000",
                "cap_fp": "0000000000000000",
                "dev": "00:04",
                "item": "0",
                "mode": "040555",
                "nametype": "PARENT"
            },
            {
                "nametype": "NORMAL",
                "ogid": "0",
                "ouid": "0",
                "cap_fe": "0",
                "dev": "00:04",
                "item": "1",
                "mode": "0100644",
                "name": "/proc/1/oom_score_adj",
                "rdev": "00:00",
                "cap_fi": "0000000000000000",
                "cap_fp": "0000000000000000",
                "cap_fver": "0",
                "inode": "25973"
            }
        ],
        "message_type": "syscall",
        "sequence": 9052,
        "result": "fail",
        "data": {
            "tty": "(none)",
            "exit": "EACCES",
            "a0": "7ffc1bfcdfa0",
            "a3": "7ffc1bfcde00",
            "a2": "55881de610b8",
            "a1": "1b6",
            "arch": "x86_64",
            "syscall": "creat"
        },
        "user": {
            "filesystem": {
                "group": {}
            },
            "audit": {},
            "saved": {
                "group": {
                    "id": "5511617b-5ca7-4dd5-bb80-d8590dff4430",
                    "name": "housetodd"
                },
                "id": "5511617b-5ca7-4dd5-bb80-d8590dff4430",
                "name": "housetodd"
            },
            "group": {
                "id": "5511617b-5ca7-4dd5-bb80-d8590dff4430"
            }
        }
    },
    "file": {
        "gid": "0",
        "owner": "housetodd",
        "group": "housetodd",
        "path": "/proc/1/oom_score_adj",
        "device": "00:00",
        "inode": "25973",
        "mode": "0644",
        "uid": "0"
    },
    "host": {
        "name": "xps-housetodd",
        "ip": [
            "144.1.237.149"
        ],
        "mac": [
            "22:69:ae:27:fe:66"
        ],
        "hostname": "xps-housetodd",
        "architecture": "x86_64",
        "os": {
            "family": "debian",
            "name": "Ubuntu",
            "kernel": "4.15.0-161-generic",
            "codename": "bionic",
            "type": "linux",
            "platform": "ubuntu",
            "version": "18.04.6 LTS (Bionic Beaver)"
        },
        "id": "7dd912136af040e4a6ea4f683010b824",
        "containerized": false
    },
    "log": {
        "hostname": "xps-housetodd"
    },
    "process": {
        "title": "/opt/google/chrome/chrome --type=zygote --enable-crashpad --crashpad-handler-pid=18479 --enable-crash-reporter=, --change-stack-",
        "name": "chrome",
        "executable": "/opt/google/chrome/chrome",
        "working_directory": "/home/housetodd",
        "pid": 18488,
        "parent": {
            "pid": 18470
        }
    },
    "service": {
        "type": "auditd"
    },
    "@timestamp": "2021-11-09T17:39:26.389Z",
    "user": {
        "filesystem": {
            "id": "5511617b-5ca7-4dd5-bb80-d8590dff4430",
            "group": {
                "id": "5511617b-5ca7-4dd5-bb80-d8590dff4430",
                "name": "housetodd"
            },
            "name": "housetodd"
        },
        "name": "housetodd",
        "audit": {
            "id": "5511617b-5ca7-4dd5-bb80-d8590dff4430",
            "name": "housetodd"
        },
        "saved": {
            "group": {
                "id": "5511617b-5ca7-4dd5-bb80-d8590dff4430"
            }
        },
        "group": {
            "id": "5511617b-5ca7-4dd5-bb80-d8590dff4430",
            "name": "housetodd"
        },
        "id": "5511617b-5ca7-4dd5-bb80-d8590dff4430"
    },
    "related": {
        "user": [
            "housetodd"
        ],
        "ip": [
            "144.1.237.149"
        ],
        "hosts": [
            "xps-housetodd"
        ]
    }
}
{
    "message": "{\"@timestamp\":\"2021-11-09T19:07:37.325Z\",\"@metadata\":{\"beat\":\"auditbeat\",\"type\":\"_doc\",\"version\":\"7.15.1\"},\"event\":{\"outcome\":\"unknown\",\"kind\":\"event\",\"type\":[\"info\"],\"module\":\"auditd\",\"category\":[\"file\"],\"action\":\"violated-seccomp-policy\"},\"user\":{\"id\":\"56d2c11c-9371-4617-bac3-2c18e86042c6\",\"audit\":{\"id\":\"56d2c11c-9371-4617-bac3-2c18e86042c6\",\"name\":\"UWWL21LVdEVmqrbT\"},\"group\":{\"id\":\"56d2c11c-9371-4617-bac3-2c18e86042c6\",\"name\":\"UWWL21LVdEVmqrbT\"},\"name\":\"UWWL21LVdEVmqrbT\"},\"process\":{\"name\":\"ThreadPoolSingl\",\"executable\":\"/opt/google/chrome/chrome\",\"pid\":2720},\"host\":{\"mac\":[\"0c:5d:c0:dc:1f:3f\"],\"hostname\":\"xps-UWWL21LVdEVmqrbT\",\"architecture\":\"x86_64\",\"os\":{\"family\":\"debian\",\"name\":\"Ubuntu\",\"kernel\":\"4.15.0-161-generic\",\"codename\":\"bionic\",\"type\":\"linux\",\"platform\":\"ubuntu\",\"version\":\"18.04.6 LTS (Bionic Beaver)\"},\"id\":\"7dd912136af040e4a6ea4f683010b824\",\"containerized\":false,\"ip\":[\"43.161.42.208\"],\"name\":\"xps-UWWL21LVdEVmqrbT\"},\"agent\":{\"id\":\"e9872892-b999-4ad5-83da-d6ec9dbc1f81\",\"name\":\"xps-UWWL21LVdEVmqrbT\",\"type\":\"auditbeat\",\"version\":\"7.15.1\",\"hostname\":\"xps-UWWL21LVdEVmqrbT\",\"ephemeral_id\":\"f1ac5b09-4f0c-42cf-b9f7-f854eeae073a\"},\"ecs\":{\"version\":\"1.11.0\"},\"auditd\":{\"session\":\"2\",\"summary\":{\"how\":\"/opt/google/chrome/chrome\",\"actor\":{\"primary\":\"UWWL21LVdEVmqrbT\",\"secondary\":\"UWWL21LVdEVmqrbT\"},\"object\":{\"primary\":\"stat\",\"type\":\"process\"}},\"message_type\":\"seccomp\",\"sequence\":12522,\"result\":\"unknown\",\"data\":{\"code\":\"0x50000\",\"syscall\":\"stat\",\"compat\":\"0\",\"ip\":\"0x7fe0a0df1845\",\"arch\":\"x86_64\",\"sig\":\"0\"}},\"service\":{\"type\":\"auditd\"}}",
    "event": {
        "kind": "event",
        "module": "auditd",
        "category": [
            "file"
        ],
        "type": [
            "info"
        ],
        "action": "violated-seccomp-policy"
    },
    "agent": {
        "id": "e9872892-b999-4ad5-83da-d6ec9dbc1f81",
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        "hostname": "web-66",
        "architecture": "x86_64",
        "os": {
            "type": "linux",
            "platform": "ubuntu",
            "version": "18.04.6 LTS (Bionic Beaver)",
            "family": "debian",
            "name": "Ubuntu",
            "kernel": "4.15.0-161-generic",
            "codename": "bionic"
        },
        "id": "7dd912136af040e4a6ea4f683010b824",
        "containerized": false,
        "ip": [
            "173.8.126.146"
        ],
        "name": "web-66",
        "mac": [
            "57:4c:ff:5d:1e:41"
        ]
    },
    "log": {
        "hostname": "web-66"
    },
    "process": {
        "pid": 12416,
        "working_directory": "/home/NElD74Hc4MX8PjLF/Documents/Projets/Qh1HoDnBg4mYfHhi"
    },
    "service": {
        "type": "auditd"
    },
    "@timestamp": "2021-11-09T16:17:55.149Z",
    "user": {
        "id": "4e8ff660-f139-4248-8b64-ad29495fca9e",
        "name": "NElD74Hc4MX8PjLF",
        "audit": {
            "id": "4e8ff660-f139-4248-8b64-ad29495fca9e",
            "name": "NElD74Hc4MX8PjLF"
        }
    },
    "related": {
        "ip": [
            "173.8.126.146"
        ],
        "hosts": [
            "web-66"
        ],
        "user": [
            "NElD74Hc4MX8PjLF"
        ]
    }
}

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.
agent.hostname keyword Deprecated - use agent.name or agent.id to identify an agent. Hostname of the agent.
cloud.image.id keyword Image ID for the cloud instance.
container.image.name keyword Name of the image the container was built on.
error.message match_only_text Error message.
event.action keyword The action captured by the event.
event.category keyword Event category. The second categorization field in the hierarchy.
event.kind keyword The kind of the event. The highest categorization field in the hierarchy.
event.module keyword Name of the module this data is coming from.
event.type keyword Event type. The third categorization field in the hierarchy.
fields object Contains user configurable fields.
host.name keyword Name of the host.
log.hostname keyword Hostname of the computer (temporary fix for detection rules and smart description).
process.command_line wildcard Full command line that started the process.
process.parent.pid long Process id.

Configure

Transport to the collector

Prerequisites

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

  • Have administrator privileges on the server
  • Traffic towards the log collector sever which is using Rsyslog must be open on port TCP/514

Configure the client

Install and configure Auditbeat

To download and install Auditbeat on a Debian based distributions (including Ubuntu, Linux Mint, etc.). Use the commands that work with your system:

curl -L -O https://artifacts.elastic.co/downloads/beats/auditbeat/auditbeat-7.13.1-amd64.deb
sudo dpkg -i auditbeat-7.13.1-amd64.deb

To download and install Auditbeat on Fedora, CentOS or Red Hat Enterprise Linux, use the commands that work with your system:

curl -L -O https://artifacts.elastic.co/downloads/beats/auditbeat/auditbeat-7.13.1-x86_64.rpm
sudo rpm -vi auditbeat-7.13.1-x86_64.rpm

Modify the version number with the newest one.

Auditbeat uses modules to collect audit information. By default, Auditbeat uses a configuration that’s tailored to the operating system where Auditbeat is running.

Replace the configuration file /etc/auditbeat/auditbeat.yml by the following content:

########################## Auditbeat Configuration #############################

# =========================== Modules configuration ============================
auditbeat.modules:

# The auditd module collects events from the audit framework in the Linux
# kernel. You need to specify audit rules for the events that you want to audit.
- module: auditd
  resolve_ids: true
  failure_mode: silent
  backlog_limit: 8196
  rate_limit: 0
  include_raw_message: false
  include_warnings: false

  # Load audit rules
  audit_rules: |
    ## Example of audit rules here. Comment what is NOT needed
    ## Executions.
    -a always,exit -F arch=b64 -S execve,execveat -k exec

    ## External access (warning: these can be expensive to audit).
    -a always,exit -F arch=b64 -S accept,bind,connect -F key=external-access

    ## Identity changes.
    -w /etc/group -p wa -k identity
    -w /etc/passwd -p wa -k identity
    -w /etc/gshadow -p wa -k identity

    ## Unauthorized access attempts.
    -a always,exit -F arch=b64 -S open,creat,truncate,ftruncate,openat,open_by_handle_at -F exit=-EACCES -k access
    -a always,exit -F arch=b64 -S open,creat,truncate,ftruncate,openat,open_by_handle_at -F exit=-EPERM -k access

# The file integrity module sends events when files are changed (created,
# updated, deleted). The events contain file metadata and hashes.
- module: file_integrity
  paths:
  - /bin
  - /usr/bin
  - /sbin
  - /usr/sbin
  - /etc
  - /var/spool/cron/crontabs
  - /etc/cron.d
  - /etc/cron.daily
  - /etc/cron.hourly
  - /etc/cron.monthly
  - /etc/cron.weekly


  scan_at_start: true
  scan_rate_per_sec: 50 MiB
  max_file_size: 100 MiB
  hash_types: [sha1]

  # Detect changes to files included in subdirectories. Disabled by default.
  recursive: false

- module: system
  datasets:
    - package   # Installed, updated, and removed packages
  period: 2m

- module: system
  datasets:
    - host      # General host information, e.g. uptime, IPs
    - login     # User logins, logouts, and system boots.
    - process   # Started and stopped processes
    - socket    # Opened and closed sockets
    - user      # User information


  user.detect_password_changes: true

# ================================== Outputs ===================================
# ---------------------------- Elasticsearch Output ----------------------------
output.elasticsearch:
  enabled: false

# -------------------------------- File Output ---------------------------------
output.file:
  enabled: true

  # Configure JSON encoding
  codec.json:
    #pretty: false
    # Configure escaping HTML symbols in strings.
    #escape_html: false

  # Path to the directory where to save the generated files.
  path: "/tmp/auditbeat"
  filename: auditbeat
  rotate_every_kb: 10000
  number_of_files: 7
  permissions: 0600

# =================================== Paths ====================================

path.home: "/usr/share/auditbeat/bin"
path.config: "/etc/auditbeat"
path.data: "/var/lib/auditbeat"
path.logs: "/var/log/auditbeat"

# ================================== Template ==================================

# Elasticsearch template settings
setup.template.settings:
  # A dictionary of settings to place into the settings.index dictionary
  index:
    number_of_shards: 1
    #codec: best_compression

# ================================== Logging ===================================

logging.level: info

logging.to_files: true
logging.files:
  path: /var/log/auditbeat
  name: auditbeat
  rotateeverybytes: 10485760 # = 10MB
  keepfiles: 7
  permissions: 0600

Don't forget to set the right level of permission of the new auditbeat.yml if you edited a new one. sudo chmod 0600 auditbeat.yml Plus in this case ensure the owner of the file is root: sudo chown root:root auditbeat.yml

Auditbeat comes with predefined assets for parsing, indexing, and visualizing your data. To load these assets:

sudo auditbeat -e

If no error occurs, use Ctrl + C to stop running it in the terminal.

Start Auditbeat with the following command:

sudo systemctl restart auditbeat.service

Check your logs in /tmp/auditbeat/auditbeat in JSON format. It may be recommended to set up logrotate for the Auditbeat logs generated in /tmp/auditbeat.

Configure local Rsyslog service

In order to allow the rsyslog to work properly, please ensure the following packages are installed:

sudo apt install rsyslog

Settup a light client rsyslog by editing the /etc/rsyslog.conf file.

### Create a dedicated Rsyslog configuration file
module(load="imuxsock")                                 # provides support for local system logging
module(load="imklog" permitnonkernelfacility="on")      # provides kernel logging support

# Set the maximum supported message size
$MaxMessageSize 20k

# Use traditional timestamp format.
$ActionFileDefaultTemplate RSYSLOG_TraditionalFileFormat

# Set the default permissions for all log files.
$FileOwner root
$FileGroup adm
$FileCreateMode 0640
$DirCreateMode 0755
$Umask 0022

$ActionQueueType LinkedList     # create a queue stored in the RAM
$ActionQueueFileName sek_fwd    # set up the prefix for writting
$ActionQueueMaxDiskSpace 5g     # allow 5 giga of storage for the buffer
$ActionQueueSaveOnShutdown on   # write on disk is the rsyslog is whut down
$ActionResumeRetryCount -1      # prevent the rsyslog from droping the logs if the connexion is interrupted

# Where to place spool and state files
$WorkDirectory /var/spool/rsyslog
$IncludeConfig /etc/rsyslog.d/*.conf

# Rules
*.*          -/var/log/syslog

Please ensure, options $PrivDropToUser syslog and $PrivDropToGroup syslog are removed, otherwise rsyslog process could not read auditbeat output.

And add a dedicated configuration file for the Auditbeat logs in /etc/rsyslog.d/8-linux_auditbeat.conf to be sent to a log concentrator.

module(load="imfile" PollingInterval="10")              #needs to be done just once
input(type="imfile"
      File="/tmp/auditbeat/auditbeat"
      Tag="linux_auditbeat"
      Severity="info"
      Facility="local7")

if ($syslogtag contains 'linux_auditbeat') then {
     action(
         type="omfwd"
         protocol="tcp"
         target="YOUR_RSYSLOG_DESTINATION_SERVER"
         port="514"
         TCP_Framing="octet-counted"
     )
}

Don't forget to change the value of YOUR_RSYSLOG_DESTINATION_SERVER in the bottom of the rsyslog.conf file

Restart Rsyslog
sudo systemctl restart rsyslog.service

Transport to SEKOIA.IO

The reader is invited to consult the Rsyslog Transport documentation to transport logs to SEKOIA.IO.

Enjoy your events

Go to the events page to watch your incoming events.