UnDefend Nightmare Eclipse — Windows Defender Tamper via Registry, Service, or Process Kill

Ibrahim Saud@tektrix

•updated Jun 30, 2026•4•0•11

Detects various methods of disabling or tampering with Windows Defender protections, including modifying preferences via PowerShell (Set-MpPreference), stopping the WinDefend service via sc.exe, terminating the antivirus process via taskkill, or modifying Registry keys associated with Defender policies.