33 lines
884 B
YAML
33 lines
884 B
YAML
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title: Powershell AMSI Bypass via .NET Reflection
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ruletype: Sigma
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author: Markus Neis
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date: 2018/08/17
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description: Detects Request to amsiInitFailed that can be used to disable AMSI Scanning
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detection:
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SELECTION_1:
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EventID: 1
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SELECTION_2:
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CommandLine:
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- '*System.Management.Automation.AmsiUtils*'
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SELECTION_3:
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CommandLine:
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- '*amsiInitFailed*'
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condition: (SELECTION_1 and SELECTION_2 and SELECTION_3)
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falsepositives:
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- Potential Admin Activity
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id: 30edb182-aa75-42c0-b0a9-e998bb29067c
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level: high
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logsource:
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category: process_creation
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product: windows
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modified: 2021/11/27
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references:
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- https://twitter.com/mattifestation/status/735261176745988096
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- https://www.hybrid-analysis.com/sample/0ced17419e01663a0cd836c9c2eb925e3031ffb5b18ccf35f4dea5d586d0203e?environmentId=120
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status: test
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tags:
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- attack.defense_evasion
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- attack.t1089
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- attack.t1562.001
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