Hackers have attacked some 40 South Korean Government and private websites, prompting officials to warn against a significant threat to the country's computers.
The country's National Cyber Security Centre said it had seen signs of a "denial of service" attacks, where large numbers of computers trying to connect to a site at the same time in an attempt to overwhelm the server.
A South Korean cyber security company, AhnLab, said in a statement the objectives included South Koreasites belonging to presidential elections office, the Ministry of Foreign Affairs, national intelligence service, US forces Korea and large financial institutions.
South Korea's media regulation agency, the Commission communication Korea said no immediate damage to the sites was reported.
AhnLab spokesman Park Kun-woo said the attacks are similar to other earlier that they were denial of service attacks and largely targeted at the same Web sites.
AhnLab said a computer user discovered a flaw in their system on Thursday. AhnLab found malicious software designed to attack sites after analysing it, and warned the objectives in advance, so that they could prepare. As a result, Park said, there had only been a short descending some of the sites.
Government officials have said that the previous denial of service attack on the South Korean Government websites was traced Chinato. It was not immediately clear from where Friday's attack came from.
Park said people often point to China as a source of such attacks, since a large amount of malware of tribes from there. Malware is malicious software designed to access a computer without the owner's consent.
Cyber attack on South Korea in 2009 was blamed initially on north korea, but experts said later that they had no conclusive evidence that Pyongyang was responsible.
South Korean media has previously reported that north korea runs an internet warfare unit hacking directed against us and South Korean military network to collect information and interfere with the service.
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