Seoul: At least 40 South Korean websites, including that of the presidential office, were hacked Friday morning, a media report said.
The cyber attack began at 10 a.m. Friday, and hit the websites of presidential office Cheong Wa Dae, the ministry of foreign affairs and trade and top lender Kookmin Bank.
The attacks were in the form of distributed denial-of-service (DDoS), Xinhua reported citing Yonhap news agency.
AhnLab, South Korea`s top information security company, said additional attacks were expected to come at 6.30 p.m. Friday.
In DDoS attacks, hackers direct huge traffic surge to the targets, overwhelming the site`s servers and making it hard for legitimate users to access the sites.