Snagging creds from locked machines

First off, this is dead simple and shouldn’t work, but it does. Also, there is no possible way that I’m the first one that has identified this, but here it is (trust me, I tested it so many ways to confirm it because I couldn’t believe it was true)

TL;DR USB Ethernet + DHCP + Responder == Creds

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Story added 8. September 2016, content source with full text you can find at link above.