Cyber attack on South Korea to continue

According to computer security specialist AhnLab, the massive denial of service (DoS) attack that took down some of South Korea's highest profile websites yesterday is set to resume this evening.

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The massive denial of service (DoS) attack that took down some of South Korea's highest profile websites yesterday is set to resume this evening, according to computer security specialists.

The attack will restart at 9am GMT (that's 6pm local time) and be directed at a smaller number of sites that those hit a day earlier. They will include government websites and the home pages of the Chosun Ilbo newspaper and Kookmin Bank.

A DoS attack involves sending a barrage of electronic traffic to a website so that it becomes overloaded. While some users will occasionally be able to access the site being attacked most will see nothing until a network time-out message appears.

Wednesday's attack hit paralysed some of the most popular sites in South Korea including the Chosun Ilbo, Internet Auction and the electronic banking services of several major banks. The attacks also hit the US Government ministries and US Forces Korea were also taken offline by the attack that lasted throughout the working day.

See also: Is North Korea to blame for US cyber attack?

The attack is being carried out by tens of thousands of computers infected with the MyDoom virus. Many of those PCs are in South Korea although the person or persons behind the attack are likely somewhere else, according to security experts.

Over the weekend the same network of PCs was used to attack major government and commercial websites in the US.

Due to the nature of the websites attacked some have pointed the finger at North Korea. Tensions between the country and the US and South Korea are currently high following several short range missile tests at the weekend and a recent nuclear test. However security experts say they have seen nothing to indicate the North Korean government is behind the attacks.

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