frack113
546e53fb35
Co-authored-by: Nasreddine Bencherchali <8741929+nasbench@users.noreply.github.com>
26 lines
861 B
YAML
26 lines
861 B
YAML
title: Suspicious FromBase64String Usage On Gzip Archive - Ps Script
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id: df69cb1d-b891-4cd9-90c7-d617d90100ce
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related:
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- id: d75d6b6b-adb9-48f7-824b-ac2e786efe1f
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type: similar
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status: experimental
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description: Detects attempts of decoding a base64 Gzip archive in a PowerShell script. This technique is often used as a method to load malicious content into memory afterward.
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references:
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- https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse?slide=43
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author: frack113
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date: 2022/12/23
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logsource:
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product: windows
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category: ps_script
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definition: Script block logging must be enabled
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detection:
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selection:
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ScriptBlockText|contains|all:
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- 'FromBase64String'
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- 'MemoryStream'
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- 'H4sI'
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condition: selection
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falsepositives:
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- Legitimate administrative script
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level: medium
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