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For now (and I haven't seen an annoucement of a coming change about it), only trustlets signed by Microsoft can be executed in the VSM (Virtual Secure Mode), so you won't be able to write a malware or a rootkit that leverages it to hide the execution flow.

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Thanks for clarifying. With drivers they get around that by using vulnerable drivers, but this isn't regular kernel mode code execution, and MS will probably revoke certs for future vulnerable trustlets? (Or not, since that can cause outages). Sounds like a whole new area of research.

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