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UAC Bypass Abusing Winsat Path Parsing - Registry

Detects the pattern of UAC Bypass using a path parsing issue in winsat.exe (UACMe 52)

MITRE ATT&CK

T1548.002
defense-evasionprivilege-escalation

Detection Query

selection:
  TargetObject|contains: \Root\InventoryApplicationFile\winsat.exe|
  TargetObject|endswith: \LowerCaseLongPath
  Details|startswith: c:\users\
  Details|endswith: \appdata\local\temp\system32\winsat.exe
condition: selection

Author

Christian Burkard (Nextron Systems)

Created

2021-08-30

Data Sources

windowsRegistry Set Events

Platforms

windows

References

Tags

attack.defense-evasionattack.privilege-escalationattack.t1548.002
Raw Content
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.defense-evasion
    - 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