Harish SEGAR
54 lines
1.3 KiB
YAML
54 lines
1.3 KiB
YAML
title: PowerShell Downgrade Attack
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id: 6331d09b-4785-4c13-980f-f96661356249
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status: experimental
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description: Detects PowerShell downgrade attack by comparing the host versions with the actually used engine version 2.0
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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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tags:
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- attack.defense_evasion
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- attack.execution
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- attack.t1086
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author: Florian Roth (rule), Lee Holmes (idea)
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date: 2017/03/22
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falsepositives:
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- Penetration Test
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- Unknown
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level: medium
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---
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logsource:
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product: windows
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service: powershell-classic
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detection:
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selection:
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EventID: 400
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EngineVersion: "2.*"
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filter:
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HostVersion: "2.*"
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condition: selection and not filter
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---
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logsource:
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product: windows
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service: sysmon
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detection:
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selection:
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EventID: 1
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CommandLine:
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- "*-v* 2"
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- "*-V* 2"
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filter:
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Image|endswith: '\powershell.exe'
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condition: selection and filter
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---
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logsource:
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product: windows
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service: security
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detection:
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selection:
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EventID: 4688
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CommandLine:
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- "*-v* 2"
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- "*-V* 2"
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filter:
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Image|endswith: '\powershell.exe'
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condition: selection and filter
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