Website: http://www.chkrootkit.org/

Download from DownloadSpot Here: chkrootkit.org

Or just follow these instructions from root:

wget http://www.downloadspot.com/downloads/chkrootkit.tar.gz

tar -xvzf chkrootkit.tar.gz

cd chkrootkit-0.49

make sense

to run simply type this after it’s installed:

./chkrootkit

Usage: ./chkrootkit [options] [testname ...]
Options:
-h                show this help and exit
-V                show version information and exit
-l                show available tests
-d                debug
-q                quiet mode
-x                expert mode
-r dir            use dir as the root directory
-p dir1:dir2:dirN path for the external commands used by chkrootkit
-n                skip NFS mounted dirs