A recent hacking attempt on South Korea's Air Force's website apparently used methods mostly employed by North Korean hackers, a military source said Friday, raising suspicion that Pyongyang might have been behind the cyberattack.

Military authorities have been conducting an investigation into a suspected hacking attempt into the official website of the Air Force after a malicious code was found on May 11. It remains shutdown, and a temporary website has been in operation.

"We cannot determine who might be behind this, but similar hacking methods have mostly been used by North Korean hackers," a source close to the investigation told reporters on condition of anonymity.

"Our investigation has found that hackers inserted a malicious code into the main homepage of the website by taking advantage of weak points in its welfare service-related reservation system," he added.

The attack on the website infected 10 personal computers run by the Air Force, but none of them led to leaks involving sensitive military or private information, he said.

"We are currently conducting a thorough review of the overall Internet system being operated by the Air Force. ... The website can return to normal starting next week if no more problems are found," he said. (Yonhap)