A computer worm which targets industrial and factory systems is almost certainly the work of a national government agency, security experts told the Guardian – but warn that it will be near-impossible to identify the culprit.
The "Stuxnet" computer worm, which has been described as one of the "most refined pieces of malware ever discovered", has been most active in Iran, says the security company Symantec – leading some experts to conjecture that the likely target of the virus is the controversial Bushehr nuclear power plant, and that it was created by Israeli hackers.