South Korea's National Intelligence Service warned that North Korean hacking groups were repeatedly targeting domestic shipbuilders in August and September 2023. The agency said the attackers tried to compromise IT maintenance vendors for indirect access and sent phishing emails to employees to install malware. NIS assessed the campaign as tied to Kim Jong Un's push to strengthen naval forces and develop shipbuilding, and asked shipbuilders and parts suppliers to tighten controls on network separation, remote access tools, and suspicious email or web access.