StuxNet

Stuxnet is a computer worm[1] that was discovered in June 2010. It was designed to attack industrial programmable logic controllers (PLC-s). PLCs allow the automation of electromechanical processes such as those used to control machinery on factory assembly lines, amusement rides, or centrifuges for separating nuclear material. Exploiting four zero-day flaws,[2] Stuxnet functions by targeting machines using the Microsoft Windows operating system and networks, then seeking out Siemens Step7 software. Stuxnet reportedly compromised Iranian PLCs, collecting information on industrial systems and causing the fast-spinning centrifuges to tear themselves apart.[3] Stuxnet’s design and architecture are not domain-specific and it could be tailored as a platform for attacking modern SCADA and PLC systems (e.g. in the automobile or power plants), the majority of which reside in Europe, Japan and the US.[4] http://en.wikipedia.org/wiki/Stuxnet

Nov'2014: "An Unprecedented Look at Stuxnet, the World’s First Digital Weapon"

Nov'2013: Are Nuclear Power plants in Russia and US vulnerable?

Feb'2013: "The Real Story of Stuxnet" - focus on Kaspersky Lab.