Q&A Repairing Microsoft Defender after an infection?

Nagisa

Level 7
Verified
Jul 19, 2018
322
It's quite often to see the Defender gets forcefully deactivated after a successful infection, and people usually come to forums and ask how to re-enable it again. What should be the complete method for reversing Defender to its original state?
 

TairikuOkami

Level 31
Verified
Content Creator
May 13, 2017
2,076
I use this, granted files or registry are not damaged.

Code:
rem USE AT OWN RISK AS IS WITHOUT WARRANTY OF ANY KIND !!!!!

rem https://www.microsoft.com/en-us/wdsi/defenderupdates
rem https://support.microsoft.com/en-us/help/4568292/defender-update-for-windows-operating-system-installation-images
rem https://docs.microsoft.com/en-us/powershell/module/defender/set-mppreference?view=win10-ps
rem https://docs.microsoft.com/en-us/windows/security/threat-protection/microsoft-defender-atp/customize-exploit-protection
rem https://github.com/AndyFul/ConfigureDefender
rem https://github.com/AndyFul/Hard_Configurator

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 WD 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 WD 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\SecurityHealthService" /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 WD 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
rem reg add "HKLM\Software\Policies\Microsoft\Windows Defender\SpyNet" /v "SubmitSamplesConsent" /t REG_DWORD /d "1" /f

rem reg add "HKLM\Software\Microsoft\Windows Defender\Features" /v "TamperProtection" /t REG_DWORD /d "1" /f

shutdown /r
 
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