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31 lines
948 B
YAML
31 lines
948 B
YAML
title: Potential Exfiltration of Compressed Files
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id: 0d47e3f6-357f-4534-928c-202631d065fa
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description: This rule detects potential exfiltration by looking for a few compression extensions in the uri and signs of compression in the mime type, file type, and http body
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date: 2020/04/05
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author: Greg Howell, OTR (Open Threat Research)
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tags:
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- attack.exfiltration
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- attack.t1560.001
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- attack.t1005
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references:
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- https://github.com/OTRF/detection-hackathon-apt29/issues/17
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logsource:
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product: zeek
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service: http
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detection:
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selection1:
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uri|endswith:
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- '.7z'
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- '.zip'
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- '.rar'
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mime_types|endswith: 'compressed'
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selection3:
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filetype|endswith: 'compressed'
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selection4:
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http.bodyMagic|endswith: 'compressed'
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http.method: PUT
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condition: selection1 or selection3 or selection4
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falsepositives:
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- Legitimate upload/download of archives
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level: medium
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