sigmahighHunting

UAC Bypass Using Disk Cleanup

Detects the pattern of UAC Bypass using scheduled tasks and variable expansion of cleanmgr.exe (UACMe 34)

MITRE ATT&CK

defense-evasionprivilege-escalation

Detection Query

selection:
  CommandLine|endswith: '"\system32\cleanmgr.exe /autoclean /d C:'
  ParentCommandLine: C:\Windows\system32\svchost.exe -k netsvcs -p -s Schedule
  IntegrityLevel:
    - High
    - System
    - S-1-16-16384
    - S-1-16-12288
condition: selection

Author

Christian Burkard (Nextron Systems)

Created

2021-08-30

Data Sources

windowsProcess Creation Events

Platforms

windows

References

https://github.com/hfiref0x/UACME

Tags

attack.defense-evasionattack.privilege-escalationattack.t1548.002

Raw Content

title: UAC Bypass Using Disk Cleanup
id: b697e69c-746f-4a86-9f59-7bfff8eab881
status: test
description: Detects the pattern of UAC Bypass using scheduled tasks and variable expansion of cleanmgr.exe (UACMe 34)
references:
    - https://github.com/hfiref0x/UACME
author: Christian Burkard (Nextron Systems)
date: 2021-08-30
modified: 2024-12-01
tags:
    - attack.defense-evasion
    - attack.privilege-escalation
    - attack.t1548.002
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|endswith: '"\system32\cleanmgr.exe /autoclean /d C:'
        ParentCommandLine: 'C:\Windows\system32\svchost.exe -k netsvcs -p -s Schedule'
        IntegrityLevel:
            - 'High'
            - 'System'
            - 'S-1-16-16384' # System
            - 'S-1-16-12288' # High
    condition: selection
falsepositives:
    - Unknown
level: high