U.S. Officials: We Knew North Korea Hacked Sony Because We Have Been Tracking Them Since 2010

If you were wondering why the United States was so fast to blame North Korea for the Sony hack, it’s because we’ve been tracking them since 2010 (via NYT):

The trail that led American officials to blame North Korea for the destructive cyberattack on Sony Pictures Entertainment in November winds back to 2010, when the National Security Agency scrambled to break into the computer systems of a country considered one of the most impenetrable targets on earth.

Spurred by growing concern about North Korea’s maturing capabilities, the American spy agency drilled into the Chinese networks that connect North Korea to the outside world, picked through connections in Malaysia favored by North Korean hackers and penetrated directly into the North with the help of South Korea and other American allies, according to former United States and foreign officials, computer experts later briefed on the operations and a newly disclosed N.S.A. document.

A classified security agency program expanded into an ambitious effort, officials said, to place malware that could track the internal workings of many of the computers and networks used by the North’s hackers, a force that South Korea’s military recently said numbers roughly 6,000 people. Most are commanded by the country’s main intelligence service, called the Reconnaissance General Bureau, and Bureau 121, its secretive hacking unit, with a large outpost in China.

The evidence gathered by the “early warning radar” of software painstakingly hidden to monitor North Korea’s activities proved critical in persuading President Obama to accuse the government of Kim Jong-un of ordering the Sony attack, according to the officials and experts, who spoke on the condition of anonymity about the classified N.S.A. operation.

Mr. Obama’s decision to accuse North Korea of ordering the largest destructive attack against an American target — and to promise retaliation, which has begun in the form of new economic sanctions — was highly unusual: The United States had never explicitly charged another government with mounting a cyberattack on American targets.

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In the meantime, this hack has proven to be a public relations nightmare for Sony, and some aren’t so sure that North Korea is to blame.