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Add attachment_filename_containing_unicode_braille_pattern_blank_character.yml #1924

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Original file line number Diff line number Diff line change
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name: 'Attachment: Filename Containing Unicode Braille Pattern Blank Character'
description: |
Recursively identifies attachments that attempt to conceal their true file extension by using Braille Pattern Blank characters
references:
- "https://www.bleepingcomputer.com/news/security/windows-vulnerability-abused-braille-spaces-in-zero-day-attacks/"
type: "rule"
authors:
- twitter: "vector_sec"
severity: "high"
source: |
type.inbound
and any(attachments,
regex.icontains(.file_name, '\x{2800}')
or (
.file_extension in~ $file_extensions_common_archives
and any(file.explode(.), regex.icontains(.file_name, '\x{2800}'))
)
)
attack_types:
- "Malware/Ransomware"
tactics_and_techniques:
- "Evasion"
detection_methods:
- "Archive analysis"
- "File analysis"
id: "c230ca86-f563-58b0-8667-5052cc9bf3c6"