Sincere Corporation
Attack Intelligence
Sincere Corporation was compromised in a ransomware attack attributed to THEGENTLEMEN in January 2026. The organization, operating in an undisclosed sector in Japan, was added to the group's data leak site as part of an extortion campaign.
THEGENTLEMEN 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.
Sincerehq.com SINCERE Corporation is a Japanese environmental services company operating under the philosophy of "Symbiosis with Nature," offering "one-stop" solutions in waste management and building maintenance across four main segments: Resource Cycling, Recycling Business, Environmental Improvement and Building Maintenance, and Environmental Consulting. Established in 1969, the company contributes to Japan's circular economy with nationwide operations, including major facilities in Shinagawa and Yokohama.