A logo is pictured outside Sony Pictures Studios in Culver City, California December 19, 2014. [Photo/Agencies]

Graham, a member of the Senate Armed Services Committee member, said President Barack Obama should put the DPRK back on the list of state sponsors of terrorism, something Obama is reviewing.

"What's happened here it shows how exposed we are in America to cyberattack," Graham said. "If North Korea can do this to a major corporation in America, what can other people do to our country."

The FBI report determined that the DPRK was behind the attack on Sony Pictures amid plans to release The Interview, a fictional movie about an assassination plot against DPRK leader Kim Jong-un. The FBI added that it did not suspect any other country was involved in the attack.