2019-01-16 22:36:31 +00:00
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title: Powershell AMSI Bypass via .NET Reflection
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2019-11-12 22:12:27 +00:00
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id: 30edb182-aa75-42c0-b0a9-e998bb29067c
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2019-01-16 22:36:31 +00:00
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status: experimental
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description: Detects Request to amsiInitFailed that can be used to disable AMSI Scanning
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references:
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2019-03-01 23:14:20 +00:00
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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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2019-01-16 22:36:31 +00:00
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tags:
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2019-03-05 23:16:40 +00:00
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- attack.defense_evasion
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2020-09-02 00:34:34 +00:00
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- attack.t1089 # an old one
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- attack.t1562.001
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2019-01-16 22:36:31 +00:00
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author: Markus Neis
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date: 2018/08/17
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2020-09-02 00:34:34 +00:00
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modified: 2020/09/01
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2019-01-16 22:36:31 +00:00
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logsource:
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2019-03-01 23:14:20 +00:00
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category: process_creation
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product: windows
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2019-01-16 22:36:31 +00:00
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detection:
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2019-03-01 23:14:20 +00:00
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selection1:
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2020-10-15 21:20:08 +00:00
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CommandLine|contains:
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- 'System.Management.Automation.AmsiUtils'
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2019-03-01 23:14:20 +00:00
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selection2:
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2020-10-15 21:20:08 +00:00
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CommandLine|contains:
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- 'amsiInitFailed'
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2019-03-01 23:14:20 +00:00
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condition: selection1 and selection2
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2020-03-24 18:55:41 +00:00
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falsepositives:
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- Potential Admin Activity
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2019-01-16 22:36:31 +00:00
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level: high
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