In this tutorial we’ll install the Debian Linux 9 (squeeze), Apache 2 with mpm-itk (to run each web as a isolated user),...
Scan your server for rootkits with rkhunterÁstþór IP
rkhunter (Rootkit Hunter) is a tool that scans for rootkits, backdoors and possible local exploits. It does this by comparing SHA-1 hashes of important files with known good ones in online database, searching for default directories (of rootkits), wrong permissions, hidden files, suspicious strings in kernel modules, and special tests for Linux and FreeBSD.
1. Install rkhunter
apt-get install rkhunter
2. Run rkhunter to check your server
There are many more rootkit dector >> http://linuxpoison.blogspot.com/2008/05/rootkit-detectors-for-linux.html