If you ever see an error alert reporting this type of problem, first check the signature on the software that it refers to. What’s strange, though, is that this doesn’t appear to affect High Sierra and older versions of macOS. You’re seeing that message because macOS is checking the signature on your HP printer software, and being told that its signing certificate has been revoked. Thanks to the work of Thomas Reed at Malwarebytes, I can answer that this is completely unassociated with XProtect or MRT. Could it be that the XProtect update was also broken? Given the recent problems with MRT version 1.68, it’s easy to ascribe this to the same update, although this message clearly isn’t coming from MRT. Many users are today reporting that their HP printer software has suddenly stopped working, with worrying messages implying that their software is malicious and “will damage your computer”.
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