http://www.theregister.co.uk/2010/08/20/spanair_malware/
Malware may have been a contributory cause of a fatal Spanair crash that killed 154 people two years ago.
The airline's central computer which registered technical problems on planes was infected by Trojans at the time of the fatal crash and this resulted in a failure two raise an alarm over multiple problems with the plane.
http://www.bbc.co.uk/news/technology-11388018
The worm searches out industrial systems made by Siemens.
http://news.bbc.co.uk/2/hi/technology/7990997.stm
Chinese and Russian spies were behind this "pervasive" breach.
It said software had been left behind that could shut down the electric grid.