A security researcher speaking at the Chaos Computer Congress in Hamburg demonstrated a hack that rewrites an Intel Mac’s firmware using a Thunderbolt device with attack code in an option ROM. Known as Thunderstrike, the proof of concept presented by Trammel Hudson infects the Apple Extensible Firmware Interface (EFI) in a way he claims cannot be detected, nor removed by reinstalling OS X.
http://9to5mac.com/2014/12/30/security-researcher-thunderbolt-macs/
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