UAC Bypass Abusing Winsat Path Parsing - Process — Sigma Rule

Rule metadata and linked tags

Author: Christian Burkard (Nextron Systems). Source status: test; severity: high. Source dates: 2021-08-30 / 2024-12-01.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 2f3a963b493c550466d50729455e2466bd45f48d4f46dd5a0132f5b8b4708ea2

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: UAC Bypass Abusing Winsat Path Parsing - Process
id: 7a01183d-71a2-46ad-ad5c-acd989ac1793
status: test
description: Detects the pattern of UAC Bypass using a path parsing issue in winsat.exe (UACMe 52)
references:
    - https://github.com/hfiref0x/UACME
author: Christian Burkard (Nextron Systems)
date: 2021-08-30
modified: 2024-12-01
tags:
    - attack.privilege-escalation
    - attack.t1548.002
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        IntegrityLevel:
            - 'High'
            - 'System'
            - 'S-1-16-16384' # System
            - 'S-1-16-12288' # High
        ParentImage|endswith: '\AppData\Local\Temp\system32\winsat.exe'
        ParentCommandLine|contains: 'C:\Windows \system32\winsat.exe'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/hfiref0x/UACME