Windows Binary Executed From WSL — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2023-02-14 / not supplied.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 6a1a3040a85d82ddeb0561f3c8f9886dcf0759d97fff39c3307ce74f2ec43655

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Windows Binary Executed From WSL
id: ed825c86-c009-4014-b413-b76003e33d35
status: test
description: |
    Detects the execution of Windows binaries from within a WSL instance.
    This could be used to masquerade parent-child relationships
references:
    - Internal Research
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-02-14
tags:
    - attack.execution
    - attack.stealth
    - attack.t1202
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|re: '[a-zA-Z]:\\'
        CurrentDirectory|contains: '\\\\wsl.localhost' # Note: programs not supporting UNC paths (example: cmd.exe). Will default to another location
    condition: selection
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• Internal Research (source note; no public URL supplied)