SEOUL — A South Korean IT executive has been arrested for allegedly sharing server-access details with a North Korean spy agency that could allow Pyongyang to control 110,000 "zombie computers" in South Korea, the Seoul-based Dong-a Ilbo said on Wednesday.

North Korea could use these 110,000 "zombie PCs" to conduct a DoS (Denial of Service) attack—wherby groups of computers all target the same network in order to slow or stop it—on South Korean networks, the conservative daily said. "Zombie PC" refers to a computer that can be totally controlled by a remotely-based hacker.