right at north korea. the u.s. government is expected to publicly blame the regime as early as today. the big question is what will the u.s. do about it? because so far the silence has been deafening. >> cnn learning that investigators have evidence that hackers stole the credentials of a system administrator getting access to the studio's computer system. meaning it was not an inside job. the losses for sony go far beyond canceling the release of the controversial film. it could be the costliest cyberattack against a company in u.s. history. let's begin with senior washington correspondent joe johns what do we know? >> the white house and the u.s. is waiting for investigators at the fbi and the justice department to wrap up their investigation as the administration tries to deal with the fallout. from sony's decision to essentially pull the film.