Runexehelper.exe

Commands

1. ExecuteUser T1218

   Executes arbitrary code

   runexehelper.exe {PATH_ABSOLUTE:.exe}

   Launches the specified exe. Prerequisites: (1) diagtrack_action_output environment variable must be set to an existing, writable folder; (2) runexewithargs_output.txt file cannot exist in the folder indicated by the variable.

   os: Windows 10, Windows 11, Windows Server 2012, Windows Server 2016, Windows Server 2019, Windows Server 2022

   Execute: EXE

Detection

• Sigma https://github.com/SigmaHQ/sigma/blob/197615345b927682ab7ad7fa3c5f5bb2ed911eed/rules/windows/process_creation/proc_creation_win_lolbin_runexehelper.yml
• IOCc:\windows\system32\runexehelper.exe is run
• IOCExistence of runexewithargs_output.txt file

Resources

• https://twitter.com/0gtweet/status/1206692239839289344