Last year North Korean hackers went after American cyber security people. One got angry and has been carrying out a one person war against North Korea. Now North Korea hardly has a lot of computers, but he is successfully knocking them offline.
North Korea Hacked Him. So He Took Down Its Internet
Disappointed with the lack of US response to the Hermit Kingdom's attacks against US security researchers, one hacker took matters into his own hands.
www.wired.com