list-manage1.com Domain Breach Exposure Report

The telemetry indicates a significant exposure of client data, with 31 client-related events observed over the reporting period. This includes 29 historical data breaches, primarily linked to "Combolist sources," and 2 active infostealer events. The infostealer activity is associated with the "LummaC2" malware family. The majority of the observed data breaches occurred between July 2025 and June 2026, with a notable increase in client events in early 2026. The affected operating systems are Windows 10 Pro and Windows 10 Famille, both x64 versions. Given the high volume of historical data breaches and the presence of active infostealer activity, this exposure presents a moderate risk. The focus for remediation should be on investigating the "Combolist sources" and "Database dumps" to understand the extent of the historical breaches and to implement enhanced monitoring and threat hunting for LummaC2 and similar infostealer malware. Prioritizing the investigation of the 2 active infostealer events is crucial to prevent further compromise.