SigmaHQ/rules/windows/process_access/sysmon_cmstp_execution.yml

action: global
title: CMSTP Execution
id: 9d26fede-b526-4413-b069-6e24b6d07167
status: stable
description: Detects various indicators of Microsoft Connection Manager Profile Installer execution
tags:
    - attack.defense_evasion
    - attack.t1218.003
    - attack.t1191  # an old one
    - attack.execution
    - attack.t1559.001
    - attack.t1175  # an old one
    - attack.g0069
    - attack.g0080
    - car.2019-04-001
author: Nik Seetharaman
date: 2018/07/16
modified: 2020/08/24
references:
    - https://web.archive.org/web/20190720093911/http://www.endurant.io/cmstp/detecting-cmstp-enabled-code-execution-and-uac-bypass-with-sysmon/
fields:
    - CommandLine
    - ParentCommandLine
    - Details
falsepositives:
    - Legitimate CMSTP use (unlikely in modern enterprise environments)
level: high
---
logsource:
    product: windows
    category: registry_event
detection:
    # Registry Object Add
    selection2:
        TargetObject|contains: '\cmmgr32.exe'
        EventType: 'CreateKey'
    # Registry Object Value Set
    selection3:
        TargetObject|contains: '\cmmgr32.exe'
    # Process Access Call Trace
    selection4:
        CallTrace|contains: 'cmlua.dll'
    condition: 1 of them
---
logsource:
    category: process_creation
    product: windows
detection:
    # CMSTP Spawning Child Process
    selection1:
        ParentImage|endswith: '\cmstp.exe'
    condition: 1 of them