Several North Korean websites, including Korean Central News Agency (KCNA), Air Koryo, and the media outlets Uriminzokkiri and Ryugyong, among others, have been either unavailable or unstable during the last four days, with KCNA completely blocked for several hours earlier today, as reported by Yonhap News.
Internet connection has reportedly been lost in North Korea on Tuesday, allegedly as a result of the US response to the cyber-attack against Sony. Speculations over the possible US retribution have arisen after President Barack Obama promised a ‘proportional’ response to the Sony hack.
That same day, a complete blackout arose in North Korea. While the country has not much Internet to lose, some government officials and university students enjoy some supervised Internet access. North Korean hackers also have Internet access, so the Internet outage in the whole country may prevent further attacks.
The US has not confirmed their involvement. State Department press representative Marie Harf said Tuesday she ‘could not speak’ about the situation assuming North Koreans could be addressed directly regarding the Internet outage.
“It would be possible that a patriotic actor could achieve the same results with a botnet, however the President promised a proportional response,” Tom Kellermann of the California-based cybersecurity firm Trend Micro told Reuters.
The data, published by Arbor Networks, reports that DDoS attacks against North Korea began as early as Dec. 18, some time before Obama spoke of the US response and one day before the FBI confirmed Pyongyang’s involvement.
A well-known cyber-terrorist group, Lizard Squad, has recently been tweeting about North Korea. The same entity also brought down Xbox Live and PlayStation Network servers. @LizardUnit have been blocked on Twitter after the Xbox and PlayStation hack, but Arbor Networks have kept their North Korea-related Tweets.