UAC Bypass Abusing Winsat Path Parsing - Registry — Sigma Rule

Rule metadata and linked tags

Author: Christian Burkard (Nextron Systems). Source status: test; severity: high. Source dates: 2021-08-30 / 2023-08-17.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: d3f24e9d11fbdfb1f0cf5a981fcd07b36e57405b03e854598041ca4d9bb49f6e

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 - Registry
id: 6597be7b-ac61-4ac8-bef4-d3ec88174853
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: 2023-08-17
tags:
    - attack.privilege-escalation
    - attack.t1548.002
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|contains: '\Root\InventoryApplicationFile\winsat.exe|'
        TargetObject|endswith: '\LowerCaseLongPath'
        Details|startswith: 'c:\users\'
        Details|endswith: '\appdata\local\temp\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