askul.co.jp Domain Breach Exposure Report

The domain askul.co.jp has experienced a significant number of data breaches and infostealer events, totaling over 19,400 incidents within the reporting period. The majority of these events are classified as historical data breaches (85.2%), with active infostealer logs comprising the remainder (14.8%). The timeline indicates a notable increase in employee-related events starting in January 2026, coinciding with a surge in client-related events in March 2026. Malware families associated with these events include Redline, LummaC2, and Rhadamanthys, all known for credential theft and information exfiltration. The primary targets appear to be login and web application services associated with askul.co.jp, with a significant portion of data originating from "Combolist sources" within leak repositories. Given the high volume of data breaches and the prevalence of infostealer activity targeting client and employee credentials, this exposure presents a critical risk. The observed malware families are designed to steal sensitive information, potentially leading to further account compromise and financial loss. Prioritization should focus on immediate remediation of identified vulnerabilities, enhanced credential security measures, and comprehensive monitoring for any signs of ongoing or future compromise. The concentration of events in Japan suggests a localized impact, but the nature of the data suggests potential for broader implications if compromised credentials are used across other platforms.