The United States was reportedly behind the Stuxnet virus that damaged Iranian nuclear facilities and Flame, which spied on computers in the Middle East. U.S. officials have publicly declined to discuss the computer viruses.
Leaked budget: NSA and CIA launched new hacking efforts
The U.S. spends $4.3 billion annually on cyber operations, according to the report. The figure includes efforts to prevent hackers from accessing U.S. systems.
The Obama administration has been pressuring China to stop hacking into U.S. computer systems and spying on U.S. businesses.