chkrootkit is a tool to locally check for signs of a rootkit. It contains a chkrootkit: shell script that checks system binaries for rootkit modification. Chkrootkit is a powerful tool to scan your Linux server for Trojans.
Rootkit scanner is scanning tool to ensure you for about 99.9%* you’re clean of nasty tools. This tool scans for rootkits, backdoors and local exploits. rkhunter is a shell script which carries out various checks on the local system to try and detect known rootkits and malware.