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A comment on Introducing Ring -3 Rootkits: BIOS rootkit targeting vPro chipsets (2009) [pdf].

Re:Introducing Ring -3 Rootkits: BIOS rootkit targeting vPro... by TazeTSchnitzel on Sunday March 23, 2014 @11:22AM (#7453643)
Is this one place where the fabled BADBIOS could live?
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Re:Introducing Ring -3 Rootkits: BIOS rootkit targeting vPro... by jevinskie on Sunday March 23, 2014 @11:57AM (#7453763)
Seems so. The independent CPU has access to system RAM, that is pretty much game over. SMM (ring -2 in the slides) may be another good choice. [0]

[0]: https://en.wikipedia.org/wiki/System_Management_Mode

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