Stuxnet is a computer worm discovered in June 2010. Stuxnet initially spreads via Microsoft Windows, and targets Siemens industrial software and equipment. While it is not the first time that hackers have targeted industrial systems, it is the first discovered malware that spies on and subverts industrial systems, and the first to include a programmable logic controller (PLC) rootkit.
Stuxnet is believed to be the first sustained effort by one country to destroy another’s infrastructure through computer attacks. On June 1, 2012, The New York Times revealed that the program used to sabotage the computer systems at Iran’s nuclear facilities was developed by the United States with the help of Israeli intelligence.
The program used to sabotage the computer systems at Iran’s nuclear facilities which carried the Stuxnet malware was known as "Olympic Games". Part of it became public after it accidentally unleashed the Stuxnet worm across the global internet.
The worm initially spreads indiscriminately, but includes a highly specialized malware payload that is designed to target only Siemens supervisory control and data acquisition (SCADA) systems that are configured to control and monitor specific industrial processes. Stuxnet infects PLCs by subverting the Step-7 software application that is used to reprogram these devices.
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