"Certain characteristics about the 'Stars' virus have been identified, including that it is compatible with the (targeted) system," Gholam Reza Jalali, commander of the Iranian civil defence organisation, told the agency.

"In the initial stage, the damage is low and it is likely to be mistaken for governmental executable files," Jalali said, adding that Iranian experts were still investigating the full scope of the malware's abilities.

He did not say what kind of equipment the virus was targeting or when and how it had been spotted.