Kurogane Kasei Co.

Kurogane Kasei Co. was compromised in a ransomware attack attributed to ransomhouse in October 2025. The organization, operating in the Manufacturing sector in Japan, was added to the group's data leak site as part of an extortion campaign.

ransomhouse 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.

Kurogane Kasei Co., Ltd. is a development-oriented Japanese chemical company specializing in organic synthesis and fine chemicals production. Its core activities include joint R&D projects, entrusted synthesis, and scalable production from gram-level prototypes to ton-scale manufacturing. The company caters to industries such as electronics, pharmaceuticals, and agrochemicals, leveraging advanced technologies like esterification and specialized equipment for dust-free, metal-free environments. With a workforce of about 193 employees, Kurogane Kasei positions itself as an 'all-round player' in the chemical sector, prioritizing customer satisfaction through rapid prototyping and innovative solutions.