YOKOSUKA GAKUIN

YOKOSUKA GAKUIN was compromised in a ransomware attack attributed to rhysida in December 2025. The organization, operating in the Education sector in Japan, was added to the group's data leak site as part of an extortion campaign.

rhysida 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.

YOKOSUKA GAKUIN Yokosuka Gakuin, a private school in Yokosuka, Kanagawa Prefecture, Japan. The school was established in 1950. More