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28 lines
1023 B
YAML
28 lines
1023 B
YAML
title: Invoke-Obfuscation COMPRESS OBFUSCATION
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id: 20e5497e-331c-4cd5-8d36-935f6e2a9a07
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description: Detects Obfuscated Powershell via COMPRESS OBFUSCATION
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status: experimental
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author: Timur Zinniatullin, oscd.community
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date: 2020/10/18
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references:
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- https://github.com/Neo23x0/sigma/issues/1009 #(Task 19)
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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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definition: Script block logging must be enabled for 4104, Module Logging must be enabled for 4103
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detection:
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selection_1:
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EventID: 4104
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ScriptBlockText|re: '(?i).*new-object.*(?:system\.io\.compression\.deflatestream|system\.io\.streamreader).*text\.encoding\]::ascii.*readtoend'
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selection_2:
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EventID: 4103
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Payload|re: '(?i).*new-object.*(?:system\.io\.compression\.deflatestream|system\.io\.streamreader).*text\.encoding\]::ascii.*readtoend'
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condition: 1 of them
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falsepositives:
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- unknown
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level: medium |