Installing Rkhunter (Rootkit Hunter) in RHEL, CentOS and Fedora

Rkhunter (Rootkit Hunter) is an open source Unix/Linux based scanner tool for Linux systems released under GPL that scans backdoors, rootkits and local exploits on your systems. It scans hidden files, wrong permissions set on binaries, suspicious strings in kernel etc. To know more about Rkhunter and its features visit http://www.rootkit.nl/.

 

Step 1: Downloading Rkhunter

First download the latest stable version of Rkhunter tool by going tohttp://www.rootkit.nl/projects/rootkit_hunter.html or use below Wget command to download it on your systems.

# cd /tmp
# wget http://ncu.dl.sourceforge.net/project/rkhunter/rkhunter/1.4.0/rkhunter-1.4.0.tar.gz

Step 2: Installing Rkhunter

Once you have downloaded the latest version, run the following commands as a root user to install it.

# tar -xvf rkhunter-1.4.0.tar.gz
# cd rkhunter-1.4.0
# ./installer.sh --layout default --install

Step 3: Updating Rkhunter

Run the RKH updater to fill the database properties by running the following command.

# /usr/local/bin/rkhunter --update
# /usr/local/bin/rkhunter --propupd

Step 4: Setting Cronjob and Email Alerts

Create a file called rkhunter.sh under /etc/cron.daily/, which then scans your file system every day and sends email notifications to your email id. Create following file with the help of your favourite editor.

# vi /etc/cron.daily/rkhunter.sh

Add the following lines of code to it and replace “YourServerNameHere” with your “Server Name” and “[email protected]” with your “Email Id“.

#!/bin/sh
(
/usr/local/bin/rkhunter --versioncheck
/usr/local/bin/rkhunter --update
/usr/local/bin/rkhunter --cronjob --report-warnings-only
) | /bin/mail -s 'rkhunter Daily Run (PutYourServerNameHere)' [email protected]

Set execute permission on the file.

# chmod 755 /etc/cron.daily/rkhunter.sh

Step 5: Manual Scan and Usage

To scan the entire file system, run the Rkhunter as a root user.

# rkhunter --check

The above command generates log file under /var/log/rkhunter.log with the checks results made by Rkhunter. For more information and options please run the following command.

# rkhunter --help 

Was this answer helpful?

 Print this Article

Also Read

Preventing DDOS aplification open resolver attack

DDOS Attack  by open DNS resolver: Open dns resolver provides name resolution to any network...

How to Prevent DDOS with CSF

You just need to configure two csf directives, thats it. The two directives are PORTFLOOD and...

How to Block Traffic by Country in the CSF Firewall?

One of the most-requested features on cPanel servers is the ability to manage and filter traffic...

How to secure /tmp and /var/tmp

Secure /tmp Edit /etc/fstab by typing the command nano -w /etc/fstab Paste the following...

Prevent DDoS by using mod_evasive

“mod_evasive” is an evasive maneuvers module for Apache to provide evasive action in...