SigmaHQ/rules/windows/process_creation/win_cmstp_com_object_access.yml

title: CMSTP UAC Bypass via COM Object Access
id: 4b60e6f2-bf39-47b4-b4ea-398e33cfe253
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
    - car.2019-04-001
author: Nik Seetharaman
modified: 2019/07/31
date: 2019/01/16
references:
    - http://www.endurant.io/cmstp/detecting-cmstp-enabled-code-execution-and-uac-bypass-with-sysmon/
    - https://twitter.com/hFireF0X/status/897640081053364225
logsource:
    category: process_creation
    product: windows
detection:
    selection1:
        ParentCommandLine: '*\DllHost.exe'
    selection2:
        ParentCommandLine:
            - '*{3E5FC7F9-9A51-4367-9063-A120244FBEC7}'
            - '*{3E000D72-A845-4CD9-BD83-80C07C3B881F}'
    condition: selection1 and selection2
fields:
    - CommandLine
    - ParentCommandLine
    - Hashes
falsepositives:
    - Legitimate CMSTP use (unlikely in modern enterprise environments)
level: high
Converted Sysmon/1 and Security/4688 to generic process creation rules 2019-01-16 22:36:31 +00:00			`title: CMSTP UAC Bypass via COM Object Access`
Added UUIDs to rules 2019-11-12 22:12:27 +00:00			`id: 4b60e6f2-bf39-47b4-b4ea-398e33cfe253`
Converted Sysmon/1 and Security/4688 to generic process creation rules 2019-01-16 22:36:31 +00:00			`status: stable`
			`description: Detects UAC Bypass Attempt Using Microsoft Connection Manager Profile Installer Autoelevate-capable COM Objects`
			`tags:`
Increased indentation to 4 * Converted (to generic sigma) rules * Converter outputs by default with indentation 4 2019-03-01 23:14:20 +00:00			`- attack.defense_evasion`
			`- attack.privilege_escalation`
			`- attack.execution`
			`- attack.t1088`
			`- attack.t1191`
			`- attack.g0069`
First Pass 2019-06-14 04:15:38 +00:00			`- car.2019-04-001`
Converted Sysmon/1 and Security/4688 to generic process creation rules 2019-01-16 22:36:31 +00:00			`author: Nik Seetharaman`
fix: fixing rule win_cmstp_com_object_access https://github.com/Neo23x0/sigma/issues/408 2019-07-31 12:16:52 +00:00			`modified: 2019/07/31`
fix: fixed missing date fields in remaining files 2020-01-30 15:07:37 +00:00			`date: 2019/01/16`
Converted Sysmon/1 and Security/4688 to generic process creation rules 2019-01-16 22:36:31 +00:00			`references:`
Increased indentation to 4 * Converted (to generic sigma) rules * Converter outputs by default with indentation 4 2019-03-01 23:14:20 +00:00			`- http://www.endurant.io/cmstp/detecting-cmstp-enabled-code-execution-and-uac-bypass-with-sysmon/`
			`- https://twitter.com/hFireF0X/status/897640081053364225`
Converted Sysmon/1 and Security/4688 to generic process creation rules 2019-01-16 22:36:31 +00:00			`logsource:`
Increased indentation to 4 * Converted (to generic sigma) rules * Converter outputs by default with indentation 4 2019-03-01 23:14:20 +00:00			`category: process_creation`
			`product: windows`
Converted Sysmon/1 and Security/4688 to generic process creation rules 2019-01-16 22:36:31 +00:00			`detection:`
Increased indentation to 4 * Converted (to generic sigma) rules * Converter outputs by default with indentation 4 2019-03-01 23:14:20 +00:00			`selection1:`
			`ParentCommandLine: '*\DllHost.exe'`
			`selection2:`
			`ParentCommandLine:`
fix: fixing rule win_cmstp_com_object_access https://github.com/Neo23x0/sigma/issues/408 2019-07-31 12:16:52 +00:00			`- '*{3E5FC7F9-9A51-4367-9063-A120244FBEC7}'`
			`- '*{3E000D72-A845-4CD9-BD83-80C07C3B881F}'`
Increased indentation to 4 * Converted (to generic sigma) rules * Converter outputs by default with indentation 4 2019-03-01 23:14:20 +00:00			`condition: selection1 and selection2`
Converted Sysmon/1 and Security/4688 to generic process creation rules 2019-01-16 22:36:31 +00:00			`fields:`
Increased indentation to 4 * Converted (to generic sigma) rules * Converter outputs by default with indentation 4 2019-03-01 23:14:20 +00:00			`- CommandLine`
			`- ParentCommandLine`
			`- Hashes`
Converted Sysmon/1 and Security/4688 to generic process creation rules 2019-01-16 22:36:31 +00:00			`falsepositives:`
Increased indentation to 4 * Converted (to generic sigma) rules * Converter outputs by default with indentation 4 2019-03-01 23:14:20 +00:00			`- Legitimate CMSTP use (unlikely in modern enterprise environments)`
Converted Sysmon/1 and Security/4688 to generic process creation rules 2019-01-16 22:36:31 +00:00			`level: high`