Apple has just released an update to XProtect for all supported versions of macOS, bringing it to version 5303. As usual, Apple doesn’t release information about what security issues this update might add or change.

This version adds two new rules, for MACOS_SOMA_JUEN and MACOS_SOMA_LLJU, continuing to extend its coverage of the Amos/Soma family of malware.

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_15-5303

Sequoia systems only

This update has just now been released for Sequoia 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 5303 but your Mac still reports an older version is installed, you may be able to force the update using
sudo xprotect update

Update:

The update was released via iCloud at 2010 GMT.