FBI conclusively links North Korea to Sony hack

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White House: Cyber Attacks

WASHINGTON (AP) - The Obama administration on Friday formally accused the North Korean government of being responsible for the devastating hacking attack against Sony Pictures Entertainment, providing the most detailed accounting to date of a hugely expensive break-in that could lead to a U.S. response.

The FBI said in a statement it has enough evidence to conclude that North Korea was behind the punishing breach, which resulted in the disclosure of tens of thousands of leaked emails and other materials.

"North Korea's actions were intended to inflict significant harm on a U.S. business and suppress the right of American citizens to express themselves. Such acts of intimidation fall outside the bounds of acceptable state behavior," the statement said.

The FBI's case cited, among other factors, technical similarities between the Sony break-in and past "malicious cyber activity" linked directly to North Korea.

Obama administration officials had previously declined to openly blame North Korea but said they were weighing various options for a response. The statement Friday did not reveal what options were being considered. President Barack Obama is expected to face questions about the Sony hack at a year-end news conference with reporters later Friday.

The break-in escalated to terrorist threats that promoted Sony to cancel the Christmas release of the movie "The Interview." The comedy is about a plot to assassinate North Korea's leader, Kim Jong Un.

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FBI conclusively links North Korea to Sony hack
(L-R) Actors James Franco, Charles Rahi Chun and Seth Rogen arrive for the premiere of the film 'The Interview' at The Theatre at Ace Hotel in Los Angeles, California on December 11, 2014. The film, starring US actors Seth Rogen and James Franco, is a comedy about a CIA plot to assassinate its leader Kim Jong-Un, played by Randall Park. North Korea has vowed 'merciless retaliation' against what it calls a 'wanton act of terror' -- although it has denied involvement in a massive cyber attack on Sony Pictures, the studio behind the film. AFP PHOTO/STR (Photo credit should read -/AFP/Getty Images)
The entrance of Sony Pictures Studios in Culver City, California is seen December 16, 2014. 'Guardians of Peace' hackers invoked the 9/11 attacks in their most chilling threat yet against Sony Pictures, warning the Hollywood studio not to release a film which has angered North Korea. AFP PHOTO (Photo credit should read -/AFP/Getty Images)
The entrance of Sony Pictures Studios in Culver City, California is seen December 16, 2014. 'Guardians of Peace' hackers invoked the 9/11 attacks in their most chilling threat yet against Sony Pictures, warning the Hollywood studio not to release a film which has angered North Korea. AFP PHOTO (Photo credit should read -/AFP/Getty Images)
GOOD MORNING AMERICA - Seth Rogen and James Franco talk about their controversial action-comedy 'The Interview,' on GOOD MORNING AMERICA, airing Tuesday, DEC. 16 (7-9am, ET) on the ABC Television Network. (Photo by Ida Mae Astute/ABC via Getty Images)
NEW YORK, NY - DECEMBER 15: James Franco and Seth Rogen take part in a SiriusXM Town Hall with Seth Rogen and James Franco with host Lisa Lampinelli on SiriusXM's Entertainment Weekly Radio channel at the SiriusXM Studios on December 15, 2014 in New York City. (Photo by Cindy Ord/Getty Images for SiriusXM)
NEW YORK, NY - DECEMBER 15: Seth Rogen takes part in a SiriusXM Town Hall with Seth Rogen and James Franco with host Lisa Lampinelli on SiriusXM's Entertainment Weekly Radio channel at the SiriusXM Studios on December 15, 2014 in New York City. (Photo by Cindy Ord/Getty Images for SiriusXM)
LOS ANGELES, CA - DECEMBER 11: (EDITORS NOTE: This image was processed using digital filters) James Franco and Seth Rogen arrive at the Los Angeles premiere of 'The Interview' held at The Theatre at Ace Hotel Downtown LA on December 11, 2014 in Los Angeles, California. (Photo by Araya Diaz/WireImage)
Movie posters for the premiere of the film 'The Interview' at The Theatre at Ace Hotel in Los Angeles, California on December 11, 2014. The film, starring US actors Seth Rogen and James Franco, is a comedy about a CIA plot to assassinate its leader Kim Jong-Un, played by Randall Park. North Korea has vowed 'merciless retaliation' against what it calls a 'wanton act of terror' -- although it has denied involvement in a massive cyber attack on Sony Pictures, the studio behind the film. AFP PHOTO/STR (Photo credit should read -/AFP/Getty Images)
Security is seen outside The Theatre at Ace Hotel before the premiere of the film 'The Interview' in Los Angeles, California on December 11, 2014. The film, starring US actors Seth Rogen and James Franco, is a comedy about a CIA plot to assassinate its leader Kim Jong-Un, played by Randall Park. North Korea has vowed 'merciless retaliation' against what it calls a 'wanton act of terror' -- although it has denied involvement in a massive cyber attack on Sony Pictures, the studio behind the film. AFP PHOTO/STR (Photo credit should read -/AFP/Getty Images)
Heavy security is seen outside The Theatre at Ace Hotel before the premiere of the film 'The Interview' in Los Angeles, California on December 11, 2014. The film, starring Us actors Seth Rogen and James Franco, is a comedy about a CIA plot to assassinate its leader Kim Jong-Un, played by Randall Park. North Korea has vowed 'merciless retaliation' against what it calls a 'wanton act of terror' -- although it has denied involvement in a massive cyber attack on Sony Pictures, the studio behind the film. AFP PHOTO/STR (Photo credit should read -/AFP/Getty Images)
TAIYUAN, CHINA - DECEMBER 18: (CHINA OUT) A woman poses with Kim Jong-un's figure at a shopping mall on December 18, 2014 in Taiyuan, Shanxi province of China. A shopping mall held a public welfare art show of famous stars' wax figures wearing face masks to call on people to protect environment. All visitors to enter the wax figure museum should wear face masks. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images)
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