Bypass UAC via Fodhelper.exe — Sigma Rule

Rule metadata and linked tags

Author: E.M. Anhaus (originally from Atomic Blue Detections, Tony Lambert), oscd.community. Source status: test; severity: high. Source dates: 2019-10-24 / 2021-11-27.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: c07647abb2f6ecf3cb5a4f24f4d56c203c2ab0410cde2e010fea87e1db7f85ed

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: Bypass UAC via Fodhelper.exe
id: 7f741dcf-fc22-4759-87b4-9ae8376676a2
status: test
description: Identifies use of Fodhelper.exe to bypass User Account Control. Adversaries use this technique to execute privileged processes.
references:
    - https://eqllib.readthedocs.io/en/latest/analytics/e491ce22-792f-11e9-8f5c-d46d6d62a49e.html
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1548.002/T1548.002.md
author: E.M. Anhaus (originally from Atomic Blue Detections, Tony Lambert), oscd.community
date: 2019-10-24
modified: 2021-11-27
tags:
    - attack.privilege-escalation
    - attack.t1548.002
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\fodhelper.exe'
    condition: selection
falsepositives:
    - Legitimate use of fodhelper.exe utility by legitimate user
level: high

Original YAML and metadata in JSON

False positives

• Legitimate use of fodhelper.exe utility by legitimate user

Source references

• https://eqllib.readthedocs.io/en/latest/analytics/e491ce22-792f-11e9-8f5c-d46d6d62a49e.html
• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1548.002/T1548.002.md