The massive cyber attack that froze South Korea's major broadcasters and banks on Wednesday -- originated in China.
A government investigation team announced Thursday that the malicious code that infiltrated Nonghyup Bank originated from an IP address in China.
A single entity is suspected to have orchestrated the attack that affected over 32-thousand computers.
The latest development adds weight to the speculation that Pyongyang was behind the attack -- as North Korean hackers tend to attack through Chinese internet access.
Investigators were alerted to the possibility of a second attack after seeing two words -- the Latin words for "first" and "Roman army" -- in the damaged booting files of KBS' and MBC's computer hard drives.
Hacking experts think this could be a sign of a sequential attack.
During a massive DDoS attack in 2009, a second attack followed just 24 hours after the initial one.
Internet security firms in South Korea are now distributing computer vaccination programs that can be downloaded for free.
Song Ji-sun, Arirang News.

Reporter : song@arirang.co.kr