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Attachment: DOCX with malicious document template artifacts

Sublime Rules

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Summary
Detects inbound messages that carry DOCX attachments which contain artifacts associated with malicious document templates. The rule triggers when an inbound data source includes an attachment with a file_type of docx. It then explores (file.explode) the DOCX content and searches for YARA matches. Specifically, it looks for a YARA rule namemalicious_docx_document_template_artifacts to indicate the presence of template-based artifacts commonly used to weaponize documents for credential harvesting or evasive exploits. This rule combines file analysis with YARA-based pattern matching to identify malicious document templates used in phishing or credential-stealer campaigns.
Categories
  • Endpoint
  • Network
Data Sources
  • File
Created: 2026-06-26