.. /Infdefaultinstall.exe

Star

Paths:

• C:\Windows\System32\Infdefaultinstall.exe
• C:\Windows\SysWOW64\Infdefaultinstall.exe

Resources:

• https://twitter.com/KyleHanslovan/status/911997635455852544
• https://blog.conscioushacker.io/index.php/2017/10/25/evading-microsofts-autoruns/
• https://bohops.com/2018/03/10/leveraging-inf-sct-fetch-execute-techniques-for-bypass-evasion-persistence-part-2/

Acknowledgements:

• Kyle Hanslovan (@kylehanslovan)

Detections:

• Sigma: https://github.com/SigmaHQ/sigma/blob/c04bef2fbbe8beff6c7620d5d7ea6872dbe7acba/rules/windows/process_creation/proc_creation_win_infdefaultinstall_execute_sct_scripts.yml
• BlockRule: https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-application-control/microsoft-recommended-block-rules

Execute

1. Executes SCT script using scrobj.dll from a command in entered into a specially prepared INF file.

   InfDefaultInstall.exe Infdefaultinstall.inf

   Use case

   Code execution

   Privileges required

   Admin

   Operating systems

   Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11

   ATT&CK® technique

   T1218