Yulkok Ltd
Attack Intelligence
Yulkok Ltd was compromised in a ransomware attack attributed to beast in February 2026. The organization, operating in an undisclosed sector in South Korea, was added to the group's data leak site as part of an extortion campaign.
beast operates as a financially motivated ransomware-as-a-service (RaaS) operation, exfiltrating sensitive data and threatening public disclosure to pressure victims into paying ransom demands.
Yulkok Ltd. (South Korea) This is a major global player with the same name. Operations: Manufacturing high-precision parts and assemblies for the aerospace industry. Specialization: 5-axis CNC metal machining, fuselage component assembly. Partners: Collaborates with global giants such as Boeing and Airbus, as well as Korea Aerospace Industries (KAI) for the production of military aircraft (e.g., T-50, FA-50). Location: Headquartered in Changwon, South Korea; founded in 1990.