Seoul: The South Korean military raised its cyber attack warning level yesterday after computer networks crashed at major TV broadcasters and banks, with initial suspicions focused on North Korea.
The Korea Internet Security Agency, a state watchdog, said computer networks at three TV broadcasters — KBS, MBC and YTN — as well as the Shinhan and Nonghyup banks had been 'partially or entirely crippled'.
LG Uplus, an Internet service provider, also reported a network crash. An investigator from the specialist cyber wing of the national police agency said the shutdown appeared to have been triggered by a 'virus or malicious code', suggesting a concerted hacking operation.
There was no immediate confirmation of who or what was behind the multiple shutdown, which occurred around 2pm (0500 GMT), but the main finger of suspicion is likely to point at Pyongyang.
Wednesday's crash came days after North Korea accused South Korea and the United States of being behind a 'persistent and intensive' hacking assault that took a number of its official websites offline for nearly two days.
The North was believed to be behind two major cyber attacks in 2009 and 2011 that targeted South Korean government agencies and financial institutions, causing their networks to crash.