DLL Hijack File Planted in Application Directory

Darshan Thummar@Mighty

•updated Jun 11, 2026•0•0•4

This rule detects attempts to plant a DLL file in an application's 'Program Files' directory over SMB. This is a common technique used in DLL hijacking attacks, where a malicious DLL is placed in a location where a legitimate application will load it instead of the intended system DLL. The rule specifically looks for SMB traffic to port 445, containing '.dll' and '\Program Files\' in a case-insensitive manner, indicating a file transfer to a sensitive application directory.