A foreign hacker group, apparently a Chinese one, attacked the websites of a dozen mostly research and academic institutions in South Korea over the Lunar New Year holiday, the country s cyber-safety agency said on Wednesday. The hacker group, which identifies itself as Dawn Cavalry, said on its public channel on messaging app Telegram that its next target is the Korea Internet and Security Agency (KISA), which is the first government agency to become a target of the group s cyberattacks.