Recent cyber-attacks include one in Japan in which a semiconductor factory was forced to suspend operations after its control systems were infected with a virus, and one at a nuclear-related facility abroad that was forced to suspend operations.
To find out how to protect control systems from cyber-attacks, the security center will develop original computer viruses, launch simulated cyber-attacks against control systems with the viruses, and observe what happens to the systems.
http://www.yomiuri.co.jp/dy/national/T120318002932.htm
ClearSky Cyberdefense Forum 