He gave no further details. In 2013, researchers at Symantec Corp uncovered a version of the Stuxnet that was used to attack the Iranian nuclear programme in November 2007. Tehran agreed under a 2015 deal with world powers to curb the programme but President Donald Trump pulled the United States out of it in May, with Israel's backing. Washington fully restored sanctions on Tehran on Monday. Supreme Leader Ayatollah Ali Khamenei last week called for stepped up efforts to fight enemy "infiltration" in a speech to officials in charge of cyber defence, state television reported. (Writing by Parisa Hafezi; editing by David Stamp)