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34 lines
1.0 KiB
YAML
34 lines
1.0 KiB
YAML
title: Suspicious Double Extension
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id: 1cdd9a09-06c9-4769-99ff-626e2b3991b8
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description: Detects suspicious use of an .exe extension after a non-executable file extension like .pdf.exe, a set of spaces or underlines to cloak the executable file in spear phishing campaigns
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references:
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- https://blu3-team.blogspot.com/2019/06/misleading-extensions-xlsexe-docexe.html
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- https://twitter.com/blackorbird/status/1140519090961825792
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author: Florian Roth (rule), @blu3_team (idea)
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date: 2019/06/26
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tags:
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- attack.initial_access
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- attack.t1566.001
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- attack.t1193 # an old one
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logsource:
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category: process_creation
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product: windows
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detection:
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selection:
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Image|endswith:
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- '.doc.exe'
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- '.docx.exe'
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- '.xls.exe'
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- '.xlsx.exe'
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- '.ppt.exe'
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- '.pptx.exe'
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- '.rtf.exe'
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- '.pdf.exe'
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- '.txt.exe'
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- ' .exe'
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- '______.exe'
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condition: selection
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falsepositives:
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- Unknown
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level: critical
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