The AiLock ransomware group listed Yaomasa on its data leak site on 2026-08-13. Country: JP Domains named: yaomasa.com Claim as published on the leak site: 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.