29 lines
877 B
YAML
29 lines
877 B
YAML
title: Invoke-Obfuscation COMPRESS OBFUSCATION
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author: Timur Zinniatullin, oscd.community
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date: 2020/10/18
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description: Detects Obfuscated Powershell via COMPRESS OBFUSCATION
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detection:
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SELECTION_1:
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EventID: 1
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SELECTION_2:
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CommandLine|re: (?i).*new-object.*(?:system\.io\.compression\.deflatestream|system\.io\.streamreader).*text\.encoding\]::ascii.*readtoend
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condition: (SELECTION_1 and SELECTION_2)
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falsepositives:
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- unknown
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id: 7eedcc9d-9fdb-4d94-9c54-474e8affc0c7
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level: medium
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logsource:
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category: process_creation
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product: windows
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references:
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- https://github.com/Neo23x0/sigma/issues/1009
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status: experimental
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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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yml_filename: win_invoke_obfuscation_via_compress.yml
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yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation
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