DefendNot: Turning Windows Defender Against Itself

This report describes DefendNot, a proof-of-concept EDR-killer that abuses the Windows Security Center by registering a spoofed antivirus entry so Windows disables Microsoft Defender, creating stealthy loss of endpoint visibility; the write-up explains the technical mechanism, contrasts it with brute-force EDR-killing tools, and outlines detection traces and remediation guidance.