It came to light on the 10th that the Russian-linked hacker group calling itself “RansomHouse” has published internal information on the dark web, claiming it was stolen from frozen food giant Nichirei during a cyberattack in July. The published data reportedly includes what appears to be personal information of employees and business partners, as well as internal documents related to general affairs, human resources, and accounting, and account information for corporate business systems.
Nobuo Miwa, president of security firm S&J, confirmed the publication status on the dark web on the morning of the 10th. According to Miwa, while the number of records and total volume of the published data have not been specified, it is likely that nearly the entire amount of the stolen information has been exposed. As of now, no mention of a ransom payment or negotiation deadline has been confirmed.
Nichirei announced on July 13 that an internal system failure had occurred due to unauthorized external access. The disruption threw logistics functions into chaos, requiring approximately 10 days to restore normal shipping operations. The company had previously acknowledged that personal information was stored on some of the affected servers and explained that “there is a possibility that personal information has been leaked,” but it had not disclosed specific details regarding the content or scale of the compromised data.
Regarding this data leak, Nichirei stated that it is “aware of the matter but declines to comment.”
RansomHouse is known as a cybercriminal group whose primary modus operandi is “ransomware,” a type of computer virus used for extortion. The group had already issued a statement claiming responsibility for the attack on Nichirei.
In recent years, ransomware attacks targeting corporations and public institutions have surged globally. In addition to encrypting systems, the standard tactic has become a double-extortion scheme involving the theft and threat of “exposing” data. When victim organizations refuse to pay the ransom, hacker groups warn that they will publish the stolen confidential information on the dark web, and there is a continuous stream of cases where they actually follow through.
This data leak is highly likely the result of Nichirei refusing to meet the ransom demands. Attacks on social infrastructure companies responsible for food logistics inflict serious damage not only by disrupting business continuity itself but also from the perspective of protecting the personal information of business partners and employees. The company will now be forced to focus on clarifying the full extent of the information breach and responding to affected individuals, raising renewed questions about the state of corporate cybersecurity measures.
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