ComputerDefaults.exe

Commands

1. UAC BypassUser T1548.002

   Execute a binary or script as a high-integrity process without a UAC prompt.

   ComputerDefaults.exe

   Upon execution, ComputerDefaults.exe checks two registry values at HKEY_CURRENT_USER\Software\Classes\ms-settings\Shell\open\command; if these are set by an attacker, the set command will be executed as a high-integrity process without a UAC prompt being displayed to the user. See ‘resources’ for which registry keys/values to set.

   os: Windows 10, Windows 11

Detection

• IOCEvent ID 10
• IOCA binary or script spawned as a child process of ComputerDefaults.exe
• IOCChanges to HKEY_CURRENT_USER\Software\Classes\ms-settings\Shell\open\command
• Sigma https://github.com/SigmaHQ/sigma/blob/master/rules/windows/process_creation/proc_creation_win_uac_bypass_computerdefaults.yml

Resources

• https://gist.github.com/havoc3-3/812547525107bd138a1a839118a3a44b