OpalSec
31 lines
959 B
YAML
31 lines
959 B
YAML
title: Invoke-Obfuscation VAR+ Launcher
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id: 0adfbc14-0ed1-11eb-adc1-0242ac120002
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description: Detects Obfuscated use of Environment Variables to execute PowerShell
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status: experimental
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author: Jonathan Cheong, oscd.community
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date: 2020/10/15
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references:
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- https://github.com/Neo23x0/sigma/issues/1009 #(Task 24)
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tags:
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- attack.defense_evasion
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- attack.t1027
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- attack.execution
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- attack.t1059.001
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logsource:
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product: windows
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service: powershell
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detection:
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selection_1:
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EventID: 4104
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selection_2:
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- ScriptBlockText|re: 'set\s[a-zA-Z]{3,6}=Invoke-Expression'
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- ScriptBlockText|re: '(\"(?:\{\d\}){1,7}\\){1,5}'
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selection_3:
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EventID: 4103
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selection_4:
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- Payload|re: 'set\s[a-zA-Z]{3,6}=Invoke-Expression'
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- Payload|re: '(\"(?:\{\d\}){1,7}\\){1,5}'
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condition: ( selection_1 and selection_2 ) or ( selection_3 and selection_4 )
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falsepositives:
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- Unknown
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level: high |