Tuesday's report by ISNA quotes provincial civil defense chief Ali Akbar Akhavan as saying the virus targeted a power plant and some other industries in Hormozgan province in recent months.
Akhavan says Iranian computer experts were able to "successfully stop" the worm.
Iran has repeatedly claimed defusing cyber worms and malware, including Stuxnet and Flame viruses that targeted the vital oil sector, which provides 80 percent of the country's foreign revenue.
Tehran has said both worms are part of a secret U.S.-Israeli program that seeks to destabilize Iran's nuclear program.
The West suspects Iran is pursuing a nuclear weapons program, a charge Tehran denies.