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.
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.
The hackers taking responsibility for the sophisticated cyber attack against Sony Pictures is making a demand - it wants the company to stop the movie, "The Interview," a comedy about a plot to kill North Korean leader Kim Jong-Un.
North Korea is strongly suspected of being behind the hack on Sony Pictures Entertainment.
The cyber attack revealed a trove of sensitive information, including:
Employees were threatened, receiving email messages that read, "your family will be in danger." Sony Pictures is calling it a terrorist attack.
North Korea denies responsibility, but calls the hack "a righteous deed." The hackers taking responsibility warned the company to stop showing the movie of "terrorism."
OutFront, Gordon Chang, who is a columnist and author of "Nuclear Showdown: North Korea Takes on the World."
Did North Korea retaliate for a Seth Rogan movie dissing the Dear Leader? CNN's Jeanne Moos wonders who the heck hacked Sony.