Check out Ralph Langner's rather harrowing TED Talk about the Stuxnet computer worm:

When first discovered in 2010, the Stuxnet computer worm posed a baffling puzzle. Beyond its unusually high level of sophistication loomed a more troubling mystery: its purpose. Ralph Langner and team helped crack the code that revealed this digital warhead's final target -- and its covert origins. In a fascinating look inside cyber-forensics, he explains how.

Ralph Langner is a German control system security consultant. He has received worldwide recognition for his analysis of the Stuxnet malware.