Stuxnet

Stuxnet is computer malware first discovered in July, 2010 that mainly targeted Windows PCs and other industrial software and equipment. The worm exploited a zero-day vulnerability in Windows. It is believed that Stuxnet spread through infected USB flash drives.

The Stuxnet software is designed to attack only designated targets and was thus considered a technical blockbuster in malware. Stuxnet caused little (or no) harm to the computers and networks that did not meet the specific requirements. The worm would make itself inert in systems where the Siemens software was not found and would restrict the infected computer from spreading the worm to no more than three others. Stuxnet was designed to erase itself on June 24, 2012.