rkhunter (Rootkit Hunter) 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.
Install RKHunter which is the Rootkit Detection tool
# yum – -enablerepo=epel -y install rkhunter
# rkhunter – -update
# rkhunter – -propupd
If specified –rwo , display only warnings
# rkhunter – -check – -sk