jma.go.jp Domain Breach Exposure Report

The telemetry indicates a significant exposure of 310 historical data breaches and 60 active infostealer logs targeting the jma.go.jp domain over a 12-month period. The majority of these events, 83.8%, are historical data breaches, with the remaining 16.2% being active infostealer logs. The timeline shows a notable increase in both employee and client-related events starting in January 2026, peaking in March and April 2026. Malware families associated with these events include Redline (23.3%) and LummaC2 (3.3%). The data originates primarily from combolist sources (99.4%), with a small percentage from database dumps (0.6%). Geographically, the United States accounts for the highest percentage of related activity (0%), followed by Germany (0%). This exposure presents a high-risk scenario due to the volume of historical data breaches and ongoing infostealer activity, potentially impacting 65 employees and 305 clients. The concentration of events in early to mid-2026 suggests a sustained period of compromise. Remediation efforts should focus on securing credentials, investigating the source of combolist data, and enhancing endpoint detection and response to mitigate the impact of Redline and LummaC2 malware. Given the nature of the domain (jma.go.jp), which is associated with meteorological and hydrological information, the potential impact on public services and national infrastructure warrants immediate attention.