In June, Belarus antivirus company VirusBlokAda reported a new bug with some interesting features. The Stuxnet worm they discovered was programmed to specifically attack industrial control systems, and reprogram the controllers to hide the changes from view using a methods almost identical to those used in 1980's - 90's stealth viruses.
The last time someone hacked up a SCADA system like this, it caused a 3 kiloton explosion that was reported as having been the most monumental non-nuclear explosion and fire ever seen from space.
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