32 lines
850 B
YAML
32 lines
850 B
YAML
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title: PowerShell Downgrade Attack
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ruletype: Sigma
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author: Florian Roth (rule), Lee Holmes (idea), Harish Segar (improvements)
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date: 2017/03/22
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description: Detects PowerShell downgrade attack by comparing the host versions with
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the actually used engine version 2.0
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detection:
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SELECTION_1:
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EngineVersion: 2.*
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SELECTION_2:
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HostVersion: 2.*
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condition: (SELECTION_1 and not (SELECTION_2))
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falsepositives:
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- Penetration Test
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- Unknown
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id: 6331d09b-4785-4c13-980f-f96661356249
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level: medium
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logsource:
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category: ps_classic_start
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definition: fields have to be extract from event
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product: windows
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modified: 2021/10/16
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references:
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- http://www.leeholmes.com/blog/2017/03/17/detecting-and-preventing-powershell-downgrade-attacks/
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status: experimental
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tags:
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- attack.defense_evasion
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- attack.execution
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- attack.t1059.001
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- attack.t1086
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