“However, certain characteristics about the Stars worm have been identified, including that it is compatible with the (targeted) system and that the damage is very slight in the initial stage, and it is likely to be mistaken for executable files of the government.”-Gholam-Reza Jalali, Iran’s Passive Defense Organization

No other details were given.  Iran’s nuclear plant was hit with a computer worm last year.  Iranian officials are blaming the United States and Israel, along with Siemens, for that cyber attack.  Siemens made the computer software for Iran’s nuclear plant, and Iranian officials say the cyber attack would have required knowledge of the computer software.