Vangelis Stykas, a security researcher based in Greece, has been covertly infiltrating a server network operated by a North Korean hacker group for about 22 months, during which he confirmed evidence of breaches affecting 1,640 companies across 57 countries, WIRED magazine reported on the 5th. Among these, 700 to 800 companies suffered 'severe damage' due to server breaches. Stykas serves as the Chief Technology Officer at cybersecurity firm Kumio.
