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Aren’t microcode firmware updates loaded by the OS on boot? So they’re not actually persistent since it doesn’t modify any kind of flash memory in the CPU. You can just replace a malicious firmware on disk with an official one.
Am I misunderstanding how microcode firmware works?
I can’t speak for the details, but I know for sure you can load malicious firmware that cannot be cleared by the OS.
https://www.crowdstrike.com/en-us/cybersecurity-101/malware/bootkits/
From my understanding bootkits are just one example.
Someone please correct me if I am wrong.
This article is about UEFI rootkits, not malicious CPU microcode firmware.
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