The FBI said Friday that North Korea was responsible for the hack on Sony Pictures Entertainment that exposed private employee information and corporate secrets, NBC News reported. Technical analysis had revealed links to North Korean-developed malware, including lines of code and encryption algorithms, the FBI said in a statement. In the aftermath of the hacking, Sony pulled its planned Christmas Day release of "The Interview" when major movie theater chains dropped the film, citing security fears. U.S. officials had said privately earlier in the week that they suspected North Korea. White House spokesman Josh Earnest has said that any response to the hacking would be "proportional" once investigators determined who was responsible.