Suspicious Software Installer with Embedded Payload

Darshan Thummar@Mighty

•updated Jun 11, 2026•0•0•1

This rule detects suspicious software installers being downloaded over HTTP. It looks for HTTP responses containing the 'MZ' header (indicating a Windows executable) with a file size greater than 1MB, and where the HTTP URI contains keywords like 'setup', 'install', or 'update'. The rule is thresholded to trigger if three such events occur from the same source within 60 seconds, aiming to identify potential malware or unwanted software distribution.