Rkhunter Installation
Rkhunter
is a very useful tool that is used to check for trojans, rootkits, and
other security problems. This tutorial will touch on installing and
setting up a daily report for rkhunter.
Installing:
wget -c http://downloads.rootkit.nl/rkhunter-1.1.1.tar.gz
tar -zxvf rkhunter-1.1.1.tar.gz
cd rkhunter-1.1.1
./installer.sh
Now you can run a test scan with the following command:
/usr/local/bin/rkhunter -c
How to setup a daily scan report?
pico /etc/cron.daily/rkhunter.sh
add the following replacing your email address:
#!/bin/bash
(/usr/local/bin/rkhunter -c --cronjob 2>&1 | mail -s "Daily Rkhunter Scan Report" email@domain.com)
chmod +x /etc/cron.daily/rkhunter.sh
I just got a false positive!! What do i do?
False
positives are warnings which indicates there is a problem, but aren't
really a problem.
Example: some Linux distro updated a few common used
binaries like `ls` and `ps`. You (as a good sysadmin) update the new
packages and run (ofcourse) daily Rootkit Hunter. Rootkit Hunter isn't
yet aware of these new files and while scanning it resports some "bad"
files. In this case we have a false positive. You could always have
your datacenter or a system administrator check out the server to
verify that it is not compromised.
More information on rkhunter can be found here: http://www.rootkit.nl
