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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Windows Subsystem for Linux Distribution Installed

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Windows Subsystem for Linux Distribution Installed

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Detects changes to the registry that indicates the install of a new Windows Subsystem for Linux distribution by name. Adversaries may enable and use WSL for Linux to avoid detection.

Rule type: eql

Rule indices:

winlogbeat-*
logs-endpoint.events.*
logs-windows.*
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://learn.microsoft.com/en-us/windows/wsl/wsl-config

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Defense Evasion
Data Source: Elastic Endgame
Data Source: Elastic Defend

Version: 4

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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registry where host.os.type == "windows" and
 registry.path :
       ("HK*\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Lxss\\*\\PackageFamilyName",
        "\\REGISTRY\\*\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Lxss\\*\\PackageFamilyName")

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Modify Registry
- ID: T1112
- Reference URL: https://attack.mitre.org/techniques/T1112/
Technique:
- Name: Indirect Command Execution
- ID: T1202
- Reference URL: https://attack.mitre.org/techniques/T1202/

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