goo.ne.jp Domain Breach Exposure Report

The domain goo.ne.jp has experienced a significant number of data breaches and infostealer events, totaling over 27,983 incidents within the reporting period. The majority of these events, 93.6%, are classified as historical data breaches, with 2,6194 instances recorded. Additionally, 1,789 active infostealer logs were detected, representing 6.4% of the total events. The timeline indicates a surge in employee and client-related events, particularly in September 2025 and February 2026, suggesting a period of heightened compromise. The primary targeted service appears to be mail.goo.ne.jp, with numerous login and registration endpoints being accessed. Given the high volume of data breaches and the prevalence of infostealer activity, this exposure presents a critical risk. The data indicates a strong correlation with "Combolist sources" (64.5%) and "Database dumps" (35.5%) within leak repositories, suggesting credential stuffing and data exfiltration are primary attack vectors. The malware families observed, such as Redline, LummaC2, and Rhadamanthys, are commonly associated with credential theft and espionage. Remediation should focus on immediate credential reset for all affected users, enhanced monitoring of mail.goo.ne.jp for suspicious login activity, and a thorough review of data security practices to prevent future data exfiltration.