Malmon is a real-time exploit/backdoor detection tool for Linux that audits the integrity of files in a given directory.
You can download it from the following link: https://packetstormsecurity.com/files/download/97736/malmon-0.1b.tar.gz
Source: https://packetstormsecurity.com/files/97736/Malmon-Detection-Tool-0.1b.html