Yaomasa

Yaomasa was compromised in a ransomware attack attributed to ailock in August 2026. The organization, operating in the Not Found sector in Japan, was added to the group's data leak site as part of an extortion campaign.

ailock 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.

Yaomasa is a Japanese supermarket chain founded in 1919 that offers fresh foods, general groceries, and daily necessities, while also operating TSUTAYA and BOOKOFF franchise stores as part of its cultural division.