Host Files System Changes via Windows Subsystem for Linux

Detects files creation and modification on the host system from the Windows Subsystem for Linux. 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://github.com/microsoft/WSL

Tags:

Elastic
Host
Windows
Threat Detection
Defense Evasion
Elastic Endgame

Version: 1

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

edit

sequence by process.entity_id with maxspan=5m
 [process where event.type == "start" and
  process.name : "dllhost.exe" and
   /* Plan9FileSystem CLSID - WSL Host File System Worker */
  process.command_line : "*{DFB65C4C-B34F-435D-AFE9-A86218684AA8}*"]
 [file where process.name : "dllhost.exe" and not file.path : "?:\\Users\\*\\Downloads\\*"]

Framework: MITRE ATT&CK^TM

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

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