Use of Wfc.exe — Sigma Rule

Rule metadata and linked tags

Author: Christopher Peacock @SecurePeacock, SCYTHE @scythe_io. Source status: test; severity: medium. Source dates: 2022-06-01 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 450b6579a58c0ebe77b4abf9f723ac66e81cab327940e99dd288eb5d4132dc7e

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: Use of Wfc.exe
id: 49be8799-7b4d-4fda-ad23-cafbefdebbc5
status: test
description: The Workflow Command-line Compiler can be used for AWL bypass and is listed in Microsoft's recommended block rules.
references:
    - https://lolbas-project.github.io/lolbas/OtherMSBinaries/Wfc/
    - https://learn.microsoft.com/en-us/windows/security/application-security/application-control/windows-defender-application-control/design/applications-that-can-bypass-wdac
author: 'Christopher Peacock @SecurePeacock, SCYTHE @scythe_io'
date: 2022-06-01
tags:
    - attack.execution
    - attack.stealth
    - attack.t1127
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        - Image|endswith: '\wfc.exe'
        - OriginalFileName: 'wfc.exe'
    condition: selection
falsepositives:
    - Legitimate use by a software developer
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate use by a software developer

Source references

• https://lolbas-project.github.io/lolbas/OtherMSBinaries/Wfc/
• https://learn.microsoft.com/en-us/windows/security/application-security/application-control/windows-defender-application-control/design/applications-that-can-bypass-wdac