/
posh_ps_tamper_windows_defender_set_mp.yml
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/
posh_ps_tamper_windows_defender_set_mp.yml
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title: Tamper Windows Defender - ScriptBlockLogging
id: 14c71865-6cd3-44ae-adaa-1db923fae5f2
related:
- id: ec19ebab-72dc-40e1-9728-4c0b805d722c
type: derived
status: experimental
description: Detects PowerShell scripts attempting to disable scheduled scanning and other parts of Windows Defender ATP or set default actions to allow.
references:
- https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.001/T1562.001.md
- https://docs.microsoft.com/en-us/powershell/module/defender/set-mppreference?view=windowsserver2022-ps
- https://bidouillesecurity.com/disable-windows-defender-in-powershell/
author: frack113, elhoim, Tim Shelton (fps, alias support), Swachchhanda Shrawan Poudel, Nasreddine Bencherchali (Nextron Systems)
date: 2022/01/16
modified: 2024/01/02
tags:
- attack.defense_evasion
- attack.t1562.001
logsource:
product: windows
category: ps_script
definition: 'Requirements: Script Block Logging must be enabled'
detection:
selection_options_disabling_preference:
ScriptBlockText|contains: 'Set-MpPreference'
selection_options_disabling_function:
ScriptBlockText|contains:
- '-dbaf $true'
- '-dbaf 1'
- '-dbm $true'
- '-dbm 1'
- '-dips $true'
- '-dips 1'
- '-DisableArchiveScanning $true'
- '-DisableArchiveScanning 1'
- '-DisableBehaviorMonitoring $true'
- '-DisableBehaviorMonitoring 1'
- '-DisableBlockAtFirstSeen $true'
- '-DisableBlockAtFirstSeen 1'
- '-DisableCatchupFullScan $true'
- '-DisableCatchupFullScan 1'
- '-DisableCatchupQuickScan $true'
- '-DisableCatchupQuickScan 1'
- '-DisableIntrusionPreventionSystem $true'
- '-DisableIntrusionPreventionSystem 1'
- '-DisableIOAVProtection $true'
- '-DisableIOAVProtection 1'
- '-DisableRealtimeMonitoring $true'
- '-DisableRealtimeMonitoring 1'
- '-DisableRemovableDriveScanning $true'
- '-DisableRemovableDriveScanning 1'
- '-DisableScanningMappedNetworkDrivesForFullScan $true'
- '-DisableScanningMappedNetworkDrivesForFullScan 1'
- '-DisableScanningNetworkFiles $true'
- '-DisableScanningNetworkFiles 1'
- '-DisableScriptScanning $true'
- '-DisableScriptScanning 1'
- '-MAPSReporting $false'
- '-MAPSReporting 0'
- '-drdsc $true'
- '-drdsc 1'
- '-drtm $true'
- '-drtm 1'
- '-dscrptsc $true'
- '-dscrptsc 1'
- '-dsmndf $true'
- '-dsmndf 1'
- '-dsnf $true'
- '-dsnf 1'
- '-dss $true'
- '-dss 1'
selection_other_default_actions_allow:
ScriptBlockText|contains: 'Set-MpPreference'
selection_other_default_actions_func:
ScriptBlockText|contains:
- 'HighThreatDefaultAction Allow'
- 'htdefac Allow'
- 'LowThreatDefaultAction Allow'
- 'ltdefac Allow'
- 'ModerateThreatDefaultAction Allow'
- 'mtdefac Allow'
- 'SevereThreatDefaultAction Allow'
- 'stdefac Allow'
condition: all of selection_options_disabling_* or all of selection_other_default_actions_*
falsepositives:
- Legitimate PowerShell scripts that disable Windows Defender for troubleshooting purposes. Must be investigated.
level: high