User Execution - Suspicious Executable Download from Email Referer

Darshan Thummar@Mighty

•updated Jun 11, 2026•0•0•1

This rule detects suspicious executable downloads from email-related referers. It specifically looks for HTTP traffic where the referer header contains keywords like 'mail.', 'webmail.', 'outlook.', 'gmail.', or 'yahoo.com', indicating the download originated from an email client or webmail interface. The rule further narrows down the detection to files containing the 'MZ' header (characteristic of Windows executables) with a size greater than 10000 bytes, suggesting a potential malicious executable being delivered via email.