pex.jp Domain Breach Exposure Report

The domain pex.jp has experienced a significant number of data breaches, totaling 4,532 events, and 856 infostealer logs were observed between July 2025 and June 2026. The majority of these events are linked to combolist sources, indicating a high likelihood of credential stuffing attacks. Malware families such as Vidar, Redline, and Rhadamanthys were prevalent, suggesting active credential harvesting and exfiltration. The timeline shows a notable increase in employee and client-related events, particularly in March and April 2026, coinciding with a surge in data breaches and infostealer activity. The primary affected geographies are Japan and the United States. The risk score of 79 indicates a high level of exposure. Given the high volume of data breaches and the presence of infostealer malware targeting credentials, the priority should be on immediate remediation of exposed accounts and strengthening authentication mechanisms. Focus should be placed on securing user credentials, monitoring for unauthorized access, and investigating the root cause of the data breaches, which appear to be heavily influenced by combolist exposures. The prevalence of infostealer malware targeting Windows operating systems necessitates enhanced endpoint security and user awareness training.