Hunting Down the Masterminds of the Sony Hacking

Hollywood responds to Sony's decision to cancel "The Interview" release.
3:51 | 12/19/14

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Transcript for Hunting Down the Masterminds of the Sony Hacking
It's great to have you with us on Thursday night. Fast-moving developments in cyber warfare. Federal authorities say hackers taking aim at a Hollywood giant are doing it for North Korea. Billboards once advertising the movie now covered up, the movie pulled from theaters. But tonight, many are asking, are we simply giving in to the hackers and if they could do this to Sony who's next on the next? Pierre Thomas is inside the investigation. Reporter: ABC news has learned the attack on Sony pictures was sophisticated, designed to mask who was behind it. Sources familiar with the investigation tell us the electronic assault from north Korea was routed through a number of infected computers in locations overseas -- Singapore, Thailand, Italy, Bolivia, Poland, and Cyprus. The president considers it to be a serious national security matter and it's being treated as such. Reporter: Apparently, to further cloud the trail, an administration sources says, the north Korean government directed a hacker or group from outside the country to launch the unprecedented attack. The assault include this threat to movie Goers -- the world will be full of fear. Remember the 11th of September 2001. The masterminds likely part of the elite north Korean spy unit bureau 121, which is tasked with developing an army of so-called cyber warriors. Recruited as children and trained for years at this military school. All apparently because the north Koreans are angry about a movie depicting the assassination of their leader. The administration now weighing its options. Those who are watching it will recognize they've got free license to attack critical inflag structure in the united States. Reporter: The threat of physical violence at the movie theaters was bogus. It guarantees more American companies will be hacked. Who's next? Pierre, thank you. Some famous names from Hollywood to Washington outraged saying the hackers have won. From senator McCain and actor rob Lowe. Did North Korea outsmart us? ABC's Cecilia Vega now. Reporter: In city after city today, billboards covered, theater signs taken down. Sony wiping away all signs of the interview, even scrubbing its website clean of any mention of the film. And now, from the Hollywood the backlash. Stars firing off on Twitter too. From rob Lowe -- "Wow. Everyone caved. The hackers won." And Ben stiller. Really hard to believe this is the response to a threat to freedom of expression here in America. Senator McCain saying it sets a troubling press dent. Sony cancelling the movie's Christmas premiere after hackers linked to North Korea threatened to attack theaters that showed the comedy. Now the movie giant could lose millions. The $44 million film not released in any format. Add marketing and penalties -- the price tag could top $100 million. Sony says it was the victim of an unprecedented criminal assault. But many in Hollywood now wondering if the real victim is free speech. It's going to have a chilling effect on edgy, provocative, politically charged projects. Reporter: Another movie about North Korea, starring Steve carell, also cancelled. The comedian tweeting, "It is a sad day for creative expression." These billboard, wiped clean today, but the interview's has already attacked online. People may be watching this movie whether Sony wants them to or not. David. Now to Boston and to a scene

This transcript has been automatically generated and may not be 100% accurate.

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