mediaplex.com Domain Breach Exposure Report

The telemetry indicates a significant exposure event for mediaplex.com, with 308 historical data breaches and 18 active infostealer logs observed between July 2025 and June 2026. The data breaches represent 94.5% of the total events, impacting 175 employees and 151 clients. Infostealer activity, accounting for 5.5% of events, primarily involved the Acreed and Millenium malware families. The primary affected service appears to be app.mediaplex.com, with Windows 11 being the most common operating system involved. Data sources for these events include combolist sources and database dumps. Given the high volume of historical data breaches and the presence of active infostealer logs, this situation poses a critical risk. The exposure of employee and client data, coupled with ongoing malware activity, necessitates immediate investigation and remediation. Prioritize the analysis of the data breach content and the active infostealer logs to understand the full scope of compromised information and to identify and neutralize the malware threats.