The silver anniversary of the first PC virus is approaching in January, but even after 25 years, no victory celebration is on the horizon. Today, some experts contend we are moving from cyber mayhem to cyber missiles, as multifaceted software attacks are being used to target specific industries. The original computer worm that surfaced in 1979 was designed to scour a network for idle processors to enable more efficient computer use. Stuxnet, a worm discovered in July 2010, infects, spies on and modifies the control systems of industrial utilities, including nuclear systems. It is the most important malware yet seen, says Hypponen.