chore: update defender rules
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+16
-17
@@ -11,7 +11,7 @@ references:
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- https://bidouillesecurity.com/disable-windows-defender-in-powershell/
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author: frack113, elhoim, Tim Shelton (fps, alias support), Swachchhanda Shrawan Poudel
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date: 2022/01/16
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modified: 2023/05/10
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modified: 2023/06/05
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tags:
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- attack.defense_evasion
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- attack.t1562.001
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@@ -24,45 +24,44 @@ detection:
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ScriptBlockText|contains: 'Set-MpPreference'
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selection_options_disabling_value:
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ScriptBlockText|contains:
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- '1'
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- ' 1 '
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- '$true'
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selection_options_disabling_function:
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ScriptBlockText|contains:
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- 'DisableRealtimeMonitoring'
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- 'DisableBehaviorMonitoring'
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- 'DisableScriptScanning'
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- 'dbaf'
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- 'dbm'
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- 'dips'
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- 'DisableArchiveScanning'
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- 'DisableBehaviorMonitoring'
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- 'DisableBlockAtFirstSeen'
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- 'DisableIOAVProtection'
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- 'DisableIntrusionPreventionSystem'
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- 'DisableIOAVProtection'
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- 'DisableRealtimeMonitoring'
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- 'DisableRemovableDriveScanning'
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- 'DisableScanningMappedNetworkDrivesForFullScan'
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- 'DisableScanningNetworkFiles'
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- 'DisableScriptScanning'
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- 'drdsc'
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- 'drtm'
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- 'dbm'
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- 'dss'
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- 'dbaf'
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- 'dip'
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- 'dips'
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- 'drds'
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- 'dscrptsc'
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- 'dsmndf'
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- 'dsnf'
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- 'dss'
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selection_other_default_actions_allow:
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ScriptBlockText|contains|all:
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- 'Set-MpPreference'
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- Allow
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- 'Allow'
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ScriptBlockText|contains:
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- LowThreatDefaultAction
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- ModerateThreatDefaultAction
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- HighThreatDefaultAction
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- 'LowThreatDefaultAction'
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- 'ModerateThreatDefaultAction'
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- 'HighThreatDefaultAction'
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selection_other_use_of_alias:
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ScriptBlockText|contains:
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- 'ltdefac '
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- 'mtdefac '
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- 'htdefac '
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- 'stdefac '
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condition: all of selection_options_disabling* or 1 of selection_other_*
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condition: all of selection_options_disabling_* or 1 of selection_other_*
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falsepositives:
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- Legitimate PowerShell scripts
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level: high
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