Detecting Malicious Security Product Bypass Techniques

This report analyzes the 'defendnot' tool which injects into trusted processes to interact with the Windows Security Center (WSC) API, register itself as a malicious security product, optionally persist via autorun or scheduled tasks, and ultimately disable Windows Defender; it provides Sigma rules, Sysmon/Windows Event detections, and a robustness-based detection strategy emphasizing behavior/TTP-focused telemetry over ephemeral IOCs.