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.
Step 1 :-Just download or a clone from github
git clone https://github.com/Magentron/chkrootkit.git
Step 2 :-After that it is ready to use and you can simply type: