Did the US military just hack North Korea?

It has been just over a month now since North Korea gloated about it's successful nuclear weapon test. A test which prompted the imposition of new UN sanctions against Pyongyang, and if the Korean Central News Agency (KCNA) which acts as a state mouthpiece for the Democratic People's Republic of Korea is to be believed, it has also prompted "intensive and persistent" cyber-attacks. Attacks, according to the North Koreans, which have been jointly launched by South Korea and the United States.