hochi.co.jp Domain Breach Exposure Report

The domain hochi.co.jp has experienced a significant number of data breach events, totaling 205 incidents, with an additional 10 infostealer events observed. The majority of these events, 95.3%, are attributed to historical data breaches, while 4.7% are active infostealer logs. The timeline indicates a surge in employee and client-related events starting in September 2025, with notable spikes in March and April 2026. The observed malware families include Rhadamanthys and Remus, and the primary leak repository classification points to "Combolist sources" (95.1%) and "Database dumps" (4.9%). Targeted services primarily involve login and registration endpoints for "umatoku.hochi.co.jp" and "regumatoku.hochi.co.jp". Given the high volume of historical data breaches and the presence of active infostealer logs, the priority for remediation should focus on credential compromise and data exfiltration. The prevalence of "Combolist sources" suggests that compromised credentials from previous breaches are being leveraged against these services. The targeted login endpoints indicate a risk of unauthorized access to employee and client accounts. Remediation efforts should include comprehensive credential hygiene, multi-factor authentication implementation, and a thorough review of access controls for the "umatoku" and "regumatoku" services.