On September 26, 2025, South Korean engineering firm Yooshin Engineering Corporation appeared on the leak site of the qilin ransomware group. The listing indicates that internal files were exfiltrated during a ransomware attack, potentially exposing sensitive business documents that could contain personal information of employees, clients, and partners.
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What Public Reporting Shows
Public reporting indicates the company, which provides engineering consulting services including feasibility studies, design, project management, and construction oversight both in South Korea and internationally, was listed on the qilin leak site. Available details confirm internal files were allegedly exfiltrated, though the exact volume and specific types of data remain unclear from current public sources. The incident follows the typical ransomware pattern of encryption followed by data theft and extortion threats.
No confirmed victim count has been released, and the precise contents of the leaked files have not been independently verified in open reporting. The listing itself serves as the primary public evidence of the breach.
Why This Matters for You and Your Family
When a company like Yooshin suffers a breach, the information stolen often includes names, contact details, identification numbers, addresses, and financial records of ordinary people — exactly the kind of data that can be used against you or your family. If you have ever worked with an engineering or consulting firm, used their services, or had your information shared through a client or supplier relationship, your details could be among those now in attackers’ hands.