SigmaHQ/rules/windows/sysmon/sysmon_cmstp_com_object_access.yml

title: CMSTP UAC Bypass via COM Object Access
status: stable
description: Detects UAC Bypass Attempt Using Microsoft Connection Manager Profile Installer Autoelevate-capable COM Objects
tags:
    - attack.defense_evasion
    - attack.privilege_escalation
    - attack.execution
    - attack.t1088
    - attack.t1191
    - attack.g0069
author: Nik Seetharaman
references:
    - http://www.endurant.io/cmstp/detecting-cmstp-enabled-code-execution-and-uac-bypass-with-sysmon/
    - https://twitter.com/hFireF0X/status/897640081053364225
logsource:
    product: windows
    service: sysmon
detection:
    # CMSTP Spawning Child Process
    selection1:
        EventID: 1
        ParentCommandLine:
            - '*\DllHost.exe'
            - '*\{3E5FC7F9-9A51-4367-9063-A120244FBEC7}' #CMSTPLUA
    selection2:
        EventID: 1
        ParentCommandLine:
            - '*\DllHost.exe'
            - '*\{3E000D72-A845-4CD9-BD83-80C07C3B881F}' #CMLUAUTIL, see https://twitter.com/hFireF0X/status/897640081053364225
    condition: 1 of them
fields:
    - CommandLine
    - ParentCommandLine
    - Hashes
falsepositives:
    - Legitimate CMSTP use (unlikely in modern enterprise environments)
level: high