reg delete "HKLM\Software\Policies\Microsoft\Windows Defender" /f
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Run" /v "SecurityHealth" /t REG_EXPAND_SZ /d "\"%windir%\system32\SecurityHealthSystray.exe\"" /f

rem Restore shell
reg add "HKLM\Software\Classes\*\shellex\ContextMenuHandlers\EPP" /ve /t REG_SZ /d "{09A47860-11B0-4DA5-AFA5-26D86198A780}" /f
reg add "HKLM\Software\Classes\Drive\shellex\ContextMenuHandlers\EPP" /ve /t REG_SZ /d "{09A47860-11B0-4DA5-AFA5-26D86198A780}" /f
reg add "HKLM\Software\Classes\Directory\shellex\ContextMenuHandlers\EPP" /ve /t REG_SZ /d "{09A47860-11B0-4DA5-AFA5-26D86198A780}" /f

rem Enable services
reg add "HKLM\System\CurrentControlSet\Services\BFE" /v "Start" /t REG_DWORD /d "2" /f
reg add "HKLM\System\CurrentControlSet\Services\MpsSvc" /v "Start" /t REG_DWORD /d "2" /f
reg add "HKLM\System\CurrentControlSet\Services\SgrmBroker" /v "Start" /t REG_DWORD /d "2" /f
reg add "HKLM\System\CurrentControlSet\Services\WdBoot" /v "Start" /t REG_DWORD /d "2" /f
reg add "HKLM\System\CurrentControlSet\Services\WdFilter" /v "Start" /t REG_DWORD /d "2" /f
reg add "HKLM\System\CurrentControlSet\Services\WdNisDrv" /v "Start" /t REG_DWORD /d "2" /f
reg add "HKLM\System\CurrentControlSet\Services\WdNisSvc" /v "Start" /t REG_DWORD /d "2" /f
reg add "HKLM\System\CurrentControlSet\Services\WinDefend" /v "Start" /t REG_DWORD /d "2" /f

rem 1 - Enable Logging
reg add "HKLM\System\CurrentControlSet\Control\WMI\Autologger\DefenderApiLogger" /v "Start" /t REG_DWORD /d "1" /f
reg add "HKLM\System\CurrentControlSet\Control\WMI\Autologger\DefenderAuditLogger" /v "Start" /t REG_DWORD /d "1" /f

rem Enable Tasks
schtasks /Change /TN "Microsoft\Windows\ExploitGuard\ExploitGuard MDM policy Refresh" /Enable
schtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Cache Maintenance" /Enable
schtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Cleanup" /Enable
schtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Scheduled Scan" /Enable
schtasks /Change /TN "Microsoft\Windows\Windows Defender\Windows Defender Verification" /Enable

rem CloudExtendedTimeout / 1 - 50 / block a suspicious file for up to 60 seconds (Default is 10)
rem reg add "HKLM\Software\Policies\Microsoft\Windows Defender\MpEngine" /v "MpBafsExtendedTimeout" /t REG_DWORD /d "0" /f

rem CloudBlockLevel / 0 - Default / 2 - High / 4 - High+ / 6 - Zero tolerance (block all unknown executables)
rem reg add "HKLM\Software\Policies\Microsoft\Windows Defender\MpEngine" /v "MpCloudBlockLevel" /t REG_DWORD /d "0" /f

rem 1 - Potentially Unwanted Application protection (PUP) is enabled, the applications with unwanted behavior will be blocked at download and install-time
reg add "HKLM\Software\Policies\Microsoft\Windows Defender\MpEngine" /v "MpEnablePus" /t REG_DWORD /d "1" /f

rem Block at First Sight / 0 - Enable / 1 - Disable
reg add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "DisableBlockAtFirstSeen" /t REG_DWORD /d "0" /f

rem Cloud-based Protection / 0 - Disable / 1 - Basic / 2 - Advanced
reg add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "SpynetReporting" /t REG_DWORD /d "1" /f

rem Send file samples when further analysis is required / 0 - Always prompt / 1 - Send safe samples automatically / 2 - Never send / 3 - Send all samples automatically
reg add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "SubmitSamplesConsent" /t REG_DWORD /d "1" /f

https://github.com/TairikuOokami/Windows/blob/main/Microsoft%20Defender%20Enable.bat