Apple has just released its regular weekly update to XProtect, bringing it to version 5366, for all Macs. The last version released was 5363. As usual it doesn’t release information about what security issues this update might address.

This version adds a new private rule for OSACompiledJXA to its Yara rules, and adds 6 new Yara rules for MACOS.BRUSQUEBARNACLE.ZSSTPILO, MACOS.BRUSQUEBARNACLE.JXDRHISC, MACOS.LOATHESOMELABELMAKER.NACO, MACOS.LOATHESOMELABELMAKER.MIPR, MACOS.TIMELYTURTLE.HAIMREA and MACOS.TIMELYTURTLE.OPENDIA.

Changes in the Osascript rules in XPScripts.yr include the addition of the same private rule OSACompiledJXA, and two new rules for MACOS.OSASCRIPT.BRICCHLO and MACOS.OSASCRIPT.BRJXDRHISC.

In older versions of macOS 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 Golden Gate 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_15-5366

Sequoia, Tahoe and Golden Gate systems only

This update has already been released for Sequoia and later 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 5366 but your Mac still reports an older version is installed, you should be able to force the update using
sudo xprotect update
There are no guarantees whether that will work in Sequoia, though.