Indirect Command Execution By Program Compatibility Wizard — Sigma Rule

Rule metadata and linked tags

Author: A. Sungurov , oscd.community. Source status: test; severity: low. Source dates: 2020-10-12 / 2021-11-27.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 9d034a4ca92fd6447aca939d92adf4535baef4b96872fb92de04e9acd8a595d6

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: Indirect Command Execution By Program Compatibility Wizard
id: b97cd4b1-30b8-4a9d-bd72-6293928d52bc
status: test
description: Detect indirect command execution via Program Compatibility Assistant pcwrun.exe
references:
    - https://twitter.com/pabraeken/status/991335019833708544
    - https://lolbas-project.github.io/lolbas/Binaries/Pcwrun/
author: A. Sungurov , oscd.community
date: 2020-10-12
modified: 2021-11-27
tags:
    - attack.stealth
    - attack.t1218
    - attack.execution
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\pcwrun.exe'
    condition: selection
falsepositives:
    - Need to use extra processing with 'unique_count' / 'filter' to focus on outliers as opposed to commonly seen artifacts
    - Legit usage of scripts
level: low

Original YAML and metadata in JSON

False positives

• Need to use extra processing with 'unique_count' / 'filter' to focus on outliers as opposed to commonly seen artifacts
• Legit usage of scripts

Source references

• https://twitter.com/pabraeken/status/991335019833708544
• https://lolbas-project.github.io/lolbas/Binaries/Pcwrun/