|A little help in scanning your system for rootkits...|
This document describes how to install chkrootkit and portsentry. It should work (maybe with slight changes concerning paths etc.) on all *nix operating systems.
Chkrootkit "is a tool to locally check for signs of a rootkit" (from http://www.chkrootkit.org).
"The Sentry tools provide host-level security services for the Unix platform. PortSentry, Logcheck/LogSentry, and HostSentry protect against portscans, automate log file auditing, and detect suspicious login activity on a continuous basis"...