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40 lines
1.5 KiB
YAML
40 lines
1.5 KiB
YAML
title: Powershell Used To Disable Windows Defender AV Security Monitoring
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id: a7ee1722-c3c5-aeff-3212-c777e4733217
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status: experimental
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description: Detects attackers attempting to disable Windows Defender using Powershell
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author: 'ok @securonix invrep-de, oscd.community, frack113'
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date: 2020/10/12
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modified: 2021/06/07
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references:
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- https://research.nccgroup.com/2020/06/23/wastedlocker-a-new-ransomware-variant-developed-by-the-evil-corp-group/
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- https://rvsec0n.wordpress.com/2020/01/24/malwares-that-bypass-windows-defender/
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1562.001/T1562.001.md
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tags:
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- attack.defense_evasion
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- attack.t1089 # legacy
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- attack.t1562.001
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logsource:
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category: process_creation
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product: windows
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detection:
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selection:
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Image|endswith: '\powershell.exe'
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CommandLine|contains:
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- '-DisableBehaviorMonitoring $true'
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- '-DisableRuntimeMonitoring $true'
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tamper_cmd_stop:
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CommandLine|contains|all:
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- sc
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- stop
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- WinDefend
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tamper_cmd_disabled:
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CommandLine|contains|all:
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- sc
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- config
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- WinDefend
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- 'start=disabled'
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condition: 1 of them
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falsepositives:
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- 'Minimal, for some older versions of dev tools, such as pycharm, developers were known to sometimes disable Windows Defender to improve performance, but this generally is not considered a good security practice.'
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level: high
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