IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Host Files System Changes via Windows Subsystem for Linuxedit
Detects files creation and modification on the host system from the 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:
Tags:
- Domain: Endpoint
- OS: Windows
- Use Case: Threat Detection
- Tactic: Defense Evasion
- Data Source: Elastic Endgame
Version: 3
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule queryedit
sequence by process.entity_id with maxspan=5m
[process where host.os.type == "windows" and 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 host.os.type == "windows" and process.name : "dllhost.exe" and not file.path : "?:\\Users\\*\\Downloads\\*"]
Framework: MITRE ATT&CKTM
-
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/