.. /Setupapi.dll

Star

Paths:

• c:\windows\system32\setupapi.dll
• c:\windows\syswow64\setupapi.dll

Resources:

• https://github.com/huntresslabs/evading-autoruns
• https://twitter.com/pabraeken/status/994742106852941825
• https://windows10dll.nirsoft.net/setupapi_dll.html

Acknowledgements:

• Kyle Hanslovan (COM Scriptlet) (@KyleHanslovan)
• Huntress Labs (COM Scriptlet) (@HuntressLabs)
• Casey Smith (COM Scriptlet) (@subTee)
• Nick Carr (Threat Intel) (@ItsReallyNick)

Detections:

• Sigma: https://github.com/SigmaHQ/sigma/blob/683b63f8184b93c9564c4310d10c571cbe367e1e/rules/windows/process_creation/proc_creation_win_rundll32_setupapi_installhinfsection.yml
• Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_rundll32_susp_activity.yml
• Splunk: https://github.com/splunk/security_content/blob/86a5b644a44240f01274c8b74d19a435c7dae66e/detections/endpoint/detect_rundll32_application_control_bypass___setupapi.yml

AWL bypass

1. Execute the specified (local or remote) .wsh/.sct script with scrobj.dll in the .inf file by calling an information file directive (section name specified).

   rundll32.exe setupapi.dll,InstallHinfSection DefaultInstall 128 C:\Tools\shady.inf

   Use case

   Run local or remote script(let) code through INF file specification.

   Privileges required

   User

   Operating systems

   Windows 10, Windows 11

   ATT&CK® technique

   T1218.011

   Tags

   Input: INF

   This function was tagged with "Input: INF".

Execute

1. Launch an executable file via the InstallHinfSection function and .inf file section directive.

   rundll32.exe setupapi.dll,InstallHinfSection DefaultInstall 128 C:\Tools\calc_exe.inf

   Use case

   Load an executable payload.

   Privileges required

   User

   Operating systems

   Windows

   ATT&CK® technique

   T1218.011

   Tags

   Input: INF

   This function was tagged with "Input: INF".