Installs or removes a Connection Manager service profile.
cmstp.exe /ni /s c:\cmstp\CorpVPN.inf
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.
Execute code hidden within an inf file. Download and run scriptlets from internet.
C:\Windows\System32\cmstp.exe, C:\Windows\SysWOW64\cmstp.exe
Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_cmstp_execution_by_creation.yml, Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_uac_bypass_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
Oddvar Moe (@oddvarmoe), Nick Tyrer (@NickTyrer)