proc_creation_win_sysinternals_accesschk_check_permissions.yml

title: Permission Check Via Accesschk.EXE
id: c625d754-6a3d-4f65-9c9a-536aea960d37
status: test
description: Detects the usage of the "Accesschk" utility, an access and privilege audit tool developed by SysInternal and often being abused by attacker to verify process privileges
references:
    - 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: Teymur Kheirkhabarov (idea), Mangatas Tondang, oscd.community, Nasreddine Bencherchali (Nextron Systems)
date: 2020/10/13
modified: 2023/02/20
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'
        - OriginalFileName: 'accesschk.exe'
    selection_cli:
        CommandLine|contains: # These are the most common flags used with this tool. You could add other combinations if needed
            - 'uwcqv '
            - 'kwsu '
            - 'qwsu '
            - 'uwdqs '
    condition: all of selection*
fields:
    - IntegrityLevel
    - Product
    - Description
    - CommandLine
falsepositives:
    - System administrator Usage
level: medium