North Korea's Internet shut down just days after the U.S. blamed Kim Jong Un's government for the hack on Sony.
So how exactly did hackers break into Sony's computer system?
Tom Foreman is OutFront.
While it may appear complicated, you may be surprised to learn jut how easy and affordable online espionage has become.
CNNMoney's Laurie Segall is OutFront with the story.
Washington (CNN) - President Barack Obama says Americans should "go to the movies" without fear, despite hackers' threats against venues that show a controversial film that Sony has now decided to pull.
Sony announced Wednesday that it won't release the film - a comedy called "The Interview" that portrays an attempt to assassinate North Korean dictator Kim Jong Un - following hackers' threats to attack movie theaters that show it.
But Obama suggested in an interview with ABC News that the threats aren't credible.
U.S. investigators say an announcement pinning the blame on hackers working for the Pyongyang regime could come as soon as Thursday.
Because of the North Korean regime's tight control of the Internet in the reclusive country, U.S. officials believe the hack was ordered directly by the country's leadership.
North Korea experts say the country has spent scarce resources on building up a unit called "Bureau 121" to carry out cyber attacks.
Earlier Wednesday, Sony pulled the film, which depicts the assassination of North Korea's leader, following a threat that people should avoid going to theaters where "The Interview" is playing.
The country's major theater companies had said they had decided to postpone or cancel next week's showing.
"In light of the decision by the majority of our exhibitors not to show the film "The Interview," we have decided not to move forward with the planned December 25 theatrical release," Sony said in its first statement on the matter.