5 December 2016, 08:09 GMT
MOSCOW (Sputnik) – It is still unknown, which data was affected by the attack.
“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,” the official told the Yonhap news agency.
The official noted that the authorities suspected North Korea of being behind the attack.
The cyber command is said to have isolated the damaged server from other parts of the network in order to prevent spread of the virus.
