Useful commands to defend Microsoft Defender
Factory Reset Microsoft Defender
cmd /c "C:\Program Files\Windows Defender\MpCmdRun.exe" -RemoveDefinitions -All Set-MpPreference -DisableIOAVProtection $true
Add an Exception to a Directory or Process
Add-MpPreference -ExclusionPath "C:\"
Add-MpPreference -ExclusionProcess "c:\internal\test.exe"
Disable Real Time Protection
Set-MpPreference -DisableRealtimeMonitoring $true
Disable Cloud Protection
Set-MpPreference -DisableBlockAtFirstSeen $true
Disable Behavior Monitoring
Set-MpPreference -DisableBehaviorMonitoring $true