Execution via WorkFolders.exe — Sigma Rule

Rule metadata and linked tags

Author: Maxime Thiebaut (@0xThiebaut). Source status: test; severity: high. Source dates: 2021-10-21 / 2022-12-25.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 8cd7a4696d513cb4855f687519911aab58bfdf6f5d9b482d3a2d85d0ff09aa9e

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: Execution via WorkFolders.exe
id: 0bbc6369-43e3-453d-9944-cae58821c173
status: test
description: Detects using WorkFolders.exe to execute an arbitrary control.exe
references:
    - https://twitter.com/elliotkillick/status/1449812843772227588
author: Maxime Thiebaut (@0xThiebaut)
date: 2021-10-21
modified: 2022-12-25
tags:
    - attack.stealth
    - attack.t1218
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\control.exe'
        ParentImage|endswith: '\WorkFolders.exe'
    filter:
        Image: 'C:\Windows\System32\control.exe'
    condition: selection and not filter
falsepositives:
    - Legitimate usage of the uncommon Windows Work Folders feature.
level: high

Original YAML and metadata in JSON

False positives

• Legitimate usage of the uncommon Windows Work Folders feature.

Source references

• https://twitter.com/elliotkillick/status/1449812843772227588