Apple has just released an update to XProtect, bringing it to version 5331. As usual, it doesn’t release information about what security issues this update might address.

This version adds two new Yara rules for additional SOMA/AMOS variants, MACOS.SOMA.FEENA and MACOS.SOMA.FEENB, and adds two more OSASCRIPT rules to XPScripts.yr, bringing its total to 19.

You can check whether this update has been installed by opening System Information via About This Mac, and selecting the Installations item under Software.

A full listing of security data file versions is given by SilentKnight and SystHist for El Capitan to Tahoe available from their product page. If your Mac hasn’t yet installed this update, you can force it using SilentKnight or at the command line.

If you want to install this as a named update in SilentKnight, its label is XProtectPlistConfigData_10_15-5331

Sequoia and Tahoe systems only

This update has already been released for Sequoia and Tahoe via iCloud. If you want to check it manually, use the Terminal command
sudo xprotect check
then enter your admin password. If that returns version 5331 but your Mac still reports an older version is installed, you should be able to force the update using
sudo xprotect update

Finally, for those testing macOS 26.4 beta 2, I am aware that SilentKnight currently crashes on launch, thanks to several of you who have been kind enough to email me. I can’t find an explanation for this in my code, so am hoping it will resolve in beta 3.