Iran has experienced the first-ever malware attack against industrial control systems, which is spreading via USB drives. The malware provides backdoors and steals critical infrastructure documents relating to SCADA systems, according to Asia CNET.
Iranian media claim attacks have hit industrial facilities that use SCADA systems provided by Siemens. A report by Symantec says that nearly 60 percent of all systems hit by the Stuxnet rootkit are in Iran.
The malware is also difficult to stop, and is not readily defeated by normal defenses, like updating anti-virus software, etc. At this time, it is currently unclear who is behind the attack as computers in India, Indonesia, the United States and several other countries have been infected.