Powershell Defender Disable Scan Feature

SigmaHQ Detections@sigmaHQ

•updated Aug 12, 2024•1•0•18

Detects attempts to disable or modify Microsoft Defender features using PowerShell commands, specifically targeting various scanning and monitoring capabilities. The rule looks for `Add-MpPreference` or `Set-MpPreference` cmdlets combined with parameters like `DisableArchiveScanning`, `DisableRealtimeMonitoring`, `DisableIOAVProtection`, `DisableBehaviorMonitoring`, `DisableBlockAtFirstSeen`, `DisableCatchupFullScan`, or `DisableCatchupQuickScan` set to `$true` or `1`. It also includes detection for base64 encoded versions of these commands.