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“The use of the data dump tactic indicates the attack was likely done by a politically motivated group,” rather than state-sponsored hackers, according to the British technology news website V3.

In testimony last year to the House Armed Services Committee, the commander of U.S. forces in South Korea, Gen. James D. Thurman, said North Korea was employing special “units of sophisticated computer hackers” to carry out cyberattacks.

“Such attacks are ideal for North Korea,” he added, explaining that they are difficult to trace.

North Korean cyberattacks “have been increasingly employed against a variety of targets including military, governmental, educational and commercial institutions” in the South, Gen. Thurman said.