Reuters
Major North Korean hacking groups have mounted "all-out" cyber attacks against South Korean defence companies for more than a year, breaching the firms' internal networks and stealing technical data, South Korea's police said on Tuesday. Hacking teams linked to North Korea's intelligence apparatus and known as Lazarus, Kimsuky and Andariel planted malicious codes in data systems of the defence companies either directly or through contractors working with them, the police said. The police, working with a team of national spy agency and private sector experts, traced the hacks to the groups, identifying them by the source IP addresses, the re-routing architecture of the signals and the signatures of the malwares used, it said.