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chkrootkit (Check Rootkit) is a common Unix-based program intended to help system administrators check their system for known rootkits. It is a shell script using common UNIX/Linux tools like the strings and grep commands to search core system programs for signatures and for comparing a traversal of the /proc filesystem with the output of the ps (process status) command to look for discrepancies.

chkrootkit is a tool to locally check for signs of a rootkit.
It contains:

chkrootkit: shell script that checks system binaries for rootkit modification.
ifpromisc.c: checks if the interface is in promiscuous mode.
chklastlog.c: checks for lastlog deletions.
chkwtmp.c: checks for wtmp deletions.
check_wtmpx.c: checks for wtmpx deletions. (Solaris only)
chkproc.c: checks for signs of LKM trojans.
chkdirs.c: checks for signs of LKM trojans.
strings.c: quick and dirty strings replacement.
chkutmp.c: checks for utmp deletions.