ATT&CK T1566.001 - Office Macro Enabled Document Download
This rule detects the download of a Microsoft Office document that is macro-enabled. It specifically looks for HTTP traffic flowing to the client (download) that contains both "[Content_Types].xml" and "vbaProject" within the file data. These strings are indicative of an Office Open XML (OOXML) file (like .docx, .xlsx, .pptx) that contains VBA macros, which are often used in phishing attacks for initial access.
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