North Korea completely lost internet access for 9.5 hours on Monday before coming back online early Tuesday. The blackout happened after US President Obama promised to “respond proportionally” to the Sony online breach, blaming Pyongyang.
US computer experts said that North Korea has experienced wide internet outages, with one saying that Pyongyang’s net connection was “totally down.”
Access to the website of the official North Korean Central News
Agency and the Rodong Sinmun newspaper were back up on Tuesday,
South Korean officials told AP.
Washington has decided not to comment as to whether it had any
involvement in the matter.
“We aren’t going to discuss, you know, publicly operational
details about the possible response options or comment on those
kind of reports in any way except to say that as we implement our
responses, some will be seen, some may not be seen,” US
State Department spokeswoman Marie Harf told journalists.
North Korea's Internet restored after 9 hour, 31 minute outage: pic.twitter.com/ZQ3IrRXbyn
— Dyn Research (@DynResearch) December 23, 2014
There have been reports that researches spotted a rise in
denial-of-service (DDoS) attacks against North Korea as early as
Thursday, which attempted to overload the country’s service,
putting into question US role.
The next day, a Twitter account connected to the hacktivist group
Anonymous, ‘theanonmessage’, tweeted that a
counterattack against the North Korean regime had begun:
“Operation RIP North Korea, engaged. #OpRIPNK.”
According to statistics analyzed by security research firm Arbor Networks, North Korea experienced two DDoS attacks on Thursday, followed by another four on Friday. On Saturday and Sunday attacks surged in numbers, with 5.97 gigabits of data drowning North Korea’s wires every second.
Dear South Korea, What's your wifi password?
— Kim Jong-un (@_Kim_Jongun) December 23, 2014
New Hampshire-based Dyn Research says the cause of the blackout is still unknown and may range from a hacker attack to a technical glitch.
"There's either a benign explanation - their routers are perhaps having a software glitch; that's possible. It also seems possible that somebody can be directing some sort of an attack against them and they're having trouble staying online," Doug Madory, director of Internet analysis at Dyn Research, told Reuters.
Internet instability and outages today in North Korea @northkoreatechhttp://t.co/wv5pvgfT8mpic.twitter.com/m3odJtHvUF
— Dyn Research (@DynResearch) December 22, 2014
According to a Dyn report, North Korea “has significantly less internet to lose, compared to other countries with similar populations: Yemen (47 networks), Afghanistan (370 networks), or Taiwan (5,030 networks).”
"And unlike these countries, North Korea maintains dependence on a single international provider, China Unicom," the document added.
Tom Kellermann, Chief Cyber-Security Officer at Trend Micro, said that Pyongyang was attacked by a botnet. A botnet is a network of home computers, often controlled by a criminal gang.
"It would be possible that a patriotic actor could achieve the same results with a botnet, however the [US] president promised a proportional response," said Kellermann.
URGENT: Massive Internet outages reported in North Korea, major cyber attack suspected http://t.co/3vDnGzKggjpic.twitter.com/cgHTgqteS1
— RT (@RT_com) December 22, 2014
The attacks come in the wake of infamous string of cyber-attacks against Sony Pictures, which ended up as a row between North Korea and the US.
On Friday, US President Barack Obama promised to “respond proportionally” to the Sony online breach, blaming North Korea for the attack.
READ MORE: US investigators link North Korea to
Sony hack - official
North Korea, on the other hand, repeatedly denied it was behind
the hack and proposed a joint investigation with the United
States into the attack against Sony Pictures, according to the
state news agency, KCNA. The calls have been dismissed by the US
envoy to the UN, Samantha Power, as “absurd.”
READ MORE: North Korea offers US joint
investigation of Sony cyberattack
Sony’s network was hacked in November, with masses of private
data, including employees’ emails, later made public.
The attack was accompanied by threats against movie theaters that
planned to show ‘The Interview’, which involves a fictional,
CIA-sanctioned plot to assassinate North Korean leader Kim
Jong-un.
READ MORE: Worst corporate hack? Leaked Sony docs
reveal Sony salaries, employee details