This article addresses the critical "single-source problem" in security telemetry, where organizations rely exclusively on Endpoint Detection and Response (EDR) or Antivirus tools. Using the CACTUS ransomware incident as a primary case study, the author illustrates how advanced adversaries actively disable these agents, leaving defenders blind unless they have a robust, independent foundation of native Windows logging.
To mitigate this risk, the author advocates for a layered telemetry approach that prioritizes high-impact data sources like process creation and logon session tracking. By utilizing LogonID correlation and native Windows Security events, defenders can maintain visibility even when primary security tools are compromised. This post serves as the introduction to a multi-part series focused on building resilient detection capabilities through Windows auditing, PowerShell logging, and Sysmon.
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