"In the current cyber climate, the FBI speculates it is not a question of if a US company will experience an attempted data-destruction attack, but when and which company will fall victim," the FBI said in a report obtained by the news website.
The 16-page document, dated December 13, 2013, has not been previously released, though marked as unclassified.
In late November, some two weeks before the planned premiere of "The Interview", a comedy about a fictional CIA assassination attempt on North Korean leader Kim Jong Un, Sony Pictures Entertainment was subject to a cyber attack which resulted in massive theft of internal company information.
On December 19, the FBI officially placed the blame for the attack on North Korea, stating that the tools used to hack Sony had similarities with attacks carried out by North Korea against South Korean media and banks the previous year.
North Korea lashed out against the film, claiming it hurt "the dignity of the supreme leadership of the DPRK", but denied responsibility for the hacking.