IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Kernel module load via insmod

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Kernel module load via insmod

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Detects the use of the insmod binary to load a Linux kernel object file. Threat actors can use this binary, given they have root privileges, to load a rootkit on a system providing them with complete control and the ability to hide from security products. Manually loading a kernel module in this manner should not be at all common and can indicate suspcious or malicious behavior.

Rule type: eql

Rule indices:

logs-endpoint.events.*
endgame-*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://decoded.avast.io/davidalvarez/linux-threat-hunting-syslogk-a-kernel-rootkit-found-under-development-in-the-wild/

Tags:

Domain: Endpoint
OS: Linux
Use Case: Threat Detection
Tactic: Persistence
Threat: Rootkit
Data Source: Elastic Endgame
Data Source: Elastic Defend

Version: 105

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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process where host.os.type == "linux" and event.type == "start" and process.name == "insmod" and process.args : "*.ko"

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
Technique:
- Name: Boot or Logon Autostart Execution
- ID: T1547
- Reference URL: https://attack.mitre.org/techniques/T1547/
Sub-technique:
- Name: Kernel Modules and Extensions
- ID: T1547.006
- Reference URL: https://attack.mitre.org/techniques/T1547/006/

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