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Sure enough, it appears that later in Mojave’s cycle, and before July 2019, Apple had changed checks made by macOS on code signatures, extending online revocation checks using OCSP to apps which had already cleared quarantine. At that time, I questioned whether macOS security was in the process of change, which might have accounted for that long pause.
The last time that there were such long intervals between security data updates was with the release of Mojave in 2018, when XProtect went without updates for nine months, and MRT was left for six months.
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As of today, the last XProtect update was pushed on 24 September (version 2151), and there has only been one very minor update to MRT (1.85) since 13 September – a period of over two months. This is important for users of those older systems, whose Gatekeeper is far less stringent and easily bypassed, and which are ignorant of notarization and unable to check it.Īlthough updates to XProtect’s data files and to MRT always have been irregular, a year ago they occurred quite frequently, with XProtect updates every 7-21 days, and MRT every month or so. Current data for XProtect and the MRT tool itself still appear to be fully functional in all versions going right back to El Capitan. XProtect and MRT are unusual among Apple’s security tools, in that they’re almost independent of the version of macOS that you’re running.
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Gatekeeper and notarization checks are built into macOS, but XProtect and MRT are dependent on their own pushed updates.
Gatekeeper, Notarization and XProtect, to block malware from running.The App Store, or the combination of Gatekeeper and Notarization, to prevent the launch or execution of malware.According to the Apple Platform Security guide, the three layers of malware defences in macOS consist of: