Windows NT System Setup
rundll32 syssetup.dll,SetupInfObjectInstallAction DefaultInstall 128 c:\temp\something.inf
Launch an executable file via the SetupInfObjectInstallAction function and .inf file section directive.
Load an executable payload.
c:\windows\system32\syssetup.dll, c:\windows\syswow64\syssetup.dll
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___syssetup.yml
Pierre-Alexandre Braeken (Execute) (@pabraeken), Matt harr0ey (Execute) (@harr0ey), Jimmy (Scriptlet) (@bohops)