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a) Download latest rootkithunter from http://www.chkrootkit.org/download/  (latest version is chkrootkit-0.49 but its has bugs) mv chkrootkit.tar.gz /usr/local/ cd /usr/local/ tar xvfz chkrootkit.tar.gz ln -s chkrootkit-0.43/ chkrootkit (replace 0.43 with the right version number) cd chkrootkit/ make sense You will now find the chkrootkit program under /usr/local/chkrootkit. Run it by typing cd /usr/local/chkrootkit/ && ./chkrootkit

Install PortsEntry Portsentry is a tool to detect port scans and log it. Download the sorce package of portsentry from sourceforge.net wget http://path/to/portsentry-1.2.tar.gz tar zxf portsentry-1.2.tar.gz make linux make install If you get errors like while compiling make linux SYSTYPE=linux Making gcc -O -Wall -DLINUX -DSUPPORT_STEALTH -o ./portsentry ./portsentry.c \ ./portsentry_io.c ./portsentry_util.c ./portsentry.c: In function [...]