A massive computer worm called Stuxnet targeted Iran's nuclear facilities and spread globally. Stuxnet code samples have raised concerns it could be used to target other countries' critical infrastructure systems. The sophisticated Stuxnet code has reportedly been offered for sale on underground forums, potentially enabling cyber terrorists to adapt it for disruptive purposes. A major global cyber espionage operation dubbed "Operation Shady RAT" targeted over 70 organizations for years and is believed to have been masterminded by China to steal military, economic and diplomatic secrets.