Saw this recently after reviewing some Defcon 23 videos. The author goes into detail about how it's working and some other fun stuff regarding anti-reverse-engineering.

2015 DEFCON 23 - Chris Domas - Repsych: Psychological Warfare in Reverse Engineering https://www.youtube.com/watch?v=HlUe0TUHOIc

And a paper by him: https://www.cl.cam.ac.uk/~sd601/papers/mov.pdf