Suspicious Permission Check Through Accesschk.EXE (via process_creation)

title: Suspicious Permission Check Through Accesschk.EXE (via process_creation)
id: 4c48e464-6a4f-5ffb-9f0f-2c3ac46b1ef0
status: stable
description: This rule detects the use of the "Accesschk" utility, an access and privilege audit tool developed by SysInternal and frequently being misused by adversary to verify process privileges
references:
    - https://attack.mitre.org/techniques/T1069/001/
    - https://speakerdeck.com/heirhabarov/hunting-for-privilege-escalation-in-windows-environment?slide=43
    - https://www.youtube.com/watch?v=JGs-aKf2OtU&ab_channel=OFFZONEMOSCOW
    - https://github.com/carlospolop/PEASS-ng/blob/fa0f2e17fbc1d86f1fd66338a40e665e7182501d/winPEAS/winPEASbat/winPEAS.bat
    - https://github.com/gladiatx0r/Powerless/blob/04f553bbc0c65baf4e57344deff84e3f016e6b51/Powerless.bat
author: Huntrule Team
date: 2026-05-21
tags:
    - attack.discovery
    - attack.t1069.001
logsource:
    product: windows
    category: process_creation
detection:
    selection_img:
        - Product|endswith: 'AccessChk'
        - Description|contains: 'Reports effective permissions'
        - Image|endswith:
              - '\accesschk.exe'
              - '\accesschk64.exe'
              - '\accesschk64a.exe'
        - OriginalFileName: 'accesschk.exe'
    selection_cli:
        CommandLine|contains:
            - 'uwcqv '
            - 'kwsu '
            - 'qwsu '
            - 'uwdqs '
    condition: all of selection*
falsepositives:
    - Unknown
level: medium