Unixcop published a tutorial about installing Rootkit Hunter in Linux.
How to Install Rootkit Hunter in Linux
rkhunter (Rootkit Hunter) is is an open-source Unix/Linux based security monitoring and analyzing tool. It is a shell script which carries out various checks on the local system to try and detect known rootkits and malware.
rkhunter is a Unix-based 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 databases, searching for default directories (of rootkits), wrong permissions, hidden files, suspicious strings in kernel modules, and special tests for Linux and FreeBSD. rkhunter is notable due to its inclusion in popular OS (Fedora, Debian, etc.)
