.. /Runonce.exe

Star

Paths:

• C:\Windows\System32\runonce.exe
• C:\Windows\SysWOW64\runonce.exe

Resources:

• https://twitter.com/pabraeken/status/990717080805789697
• https://cmatskas.com/configure-a-runonce-task-on-windows/

Acknowledgements:

• Pierre-Alexandre Braeken (@pabraeken)

Detections:

• Sigma: https://github.com/SigmaHQ/sigma/blob/c04bef2fbbe8beff6c7620d5d7ea6872dbe7acba/rules/windows/registry/registry_event/registry_event_runonce_persistence.yml
• Sigma: https://github.com/SigmaHQ/sigma/blob/c04bef2fbbe8beff6c7620d5d7ea6872dbe7acba/rules/windows/process_creation/proc_creation_win_runonce_execution.yml
• Elastic: https://github.com/elastic/detection-rules/blob/2926e98c5d998706ef7e248a63fb0367c841f685/rules/windows/persistence_run_key_and_startup_broad.toml
• IOC: Registy key add - HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\YOURKEY

Execute

1. Executes a Run Once Task that has been configured in the registry

   Runonce.exe /AlternateShellStartup

   Use case

   Persistence, bypassing defensive counter measures

   Privileges required

   Administrator

   Operating systems

   Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11

   ATT&CK® technique

   T1218