North Koreans hackers posing as remote IT workers and recruiters remain a major threat to U.S., European, and Asian companies, accounting for about half of all attacks over the past 12 months.

One North Korean group accounted for nearly half of all state-sponsored hacks on tech companies, a report found.

China-linked hackers presented the largest espionage threat to technology firms in the past year. This surge coincides with significant investments in artificial intelligence. The…