Four North Korean hacking groups continue hacking attacks on South Korean companies, public corporations and financial institutions despite rapprochement between the two Koreas.

Global cybersecurity firm FireEye said the fingerprints of major North Korean hacking groups have been found in the network servers of major companies, and financial, government and public agencies in the South, the latest as recently as Nov. 8.

The groups are Lazarus, TEMP.Hermit, Advanced Persistent Threat (APT) 38, and APT 37. Each group performed a different mission using a different hacking program. Eric Hoh at FireEye's Asia Pacific division warned the attacks are becoming more sophisticated.

