breached by North Korea, the military has said.
A spokesman told the BBC that classified
information was thought to have been stolen,
although it is not clear exactly what data was
The North has previously been accused of hacking
into banks and media outlets but never the South’s
Pyongyang has in the past rejected allegations of
cyber crime involvement.
“It seems the intranet server of the cyber
command has been contaminated with malware.
We found that some military documents, including
confidential information, have been hacked,” a
military spokesman told South Korea’s Yonhap
news agency .
It is not clear whether low-grade documents or
more important details like war plans were
The military said that the compromised section of
its network was isolated once the attack was
detected. North Korea is believed to have thousands of
personnel involved in cyberwarfare.
Since 2010 they have been focusing on application
programming interfaces (APIs), which can be
designed to attack national infrastructures, North
Korean defector and computer science professor
Kim Heung-Kwang told the BBC.
The North has a track record of alleged cyber
attacks in recent years against South Korean
government agencies, banks and media
An apparent concerted campaign involving the
planting of malicious code began in 2014, Reuters
news agency quoted police as saying.
It was aimed at laying the groundwork for an
attack on a massive scale, the agency said.
The campaign was discovered in February this
year after defence-related material including
blueprints for the wings of F-15 fighter jets was
Some 140,000 computers at 160 companies were
attacked up until this June, according to police.