infoseek.co.jp Domain Breach Exposure Report

The domain infoseek.co.jp experienced a high volume of events, with 1709 historical data breaches and 221 active infostealer logs over the reporting period. The majority of these events are linked to "Combolist sources" within leak repositories, indicating a significant exposure of credential stuffing or account takeover related data. The malware families associated with the infostealer activity include Rhadamanthys, LummaC2, and Redline, suggesting common commodity malware threats. The timeline shows a surge in employee and client-related events in September 2025 and again in March and April 2026, correlating with periods of increased infostealer activity. This exposure presents a critical risk due to the high number of historical data breaches and ongoing infostealer activity, potentially impacting a large number of employees and clients. The prevalence of combolists suggests that credentials previously compromised in other breaches are being actively used against infoseek.co.jp. Remediation should focus on immediate credential hygiene, including mandatory password resets for all users, enhanced monitoring for suspicious login activity, and a review of authentication mechanisms. Given the nature of the data breaches and infostealer activity, a thorough investigation into the root cause of these credential exposures is paramount.