Rootkit Hunter Scans for Rootkits, Backdoors, and Local Exploits
http://rkhunter.sourceforge.net

Rootkit Hunter scans files and systems for known and unknown rootkits, backdoors, and sniffers.  The package contains one shell script, a few text-based databases, and optional Perl modules. This tool scans for rootkits, backdoors, and local exploits by running tests like:

* Comparing MD5 hashes

* Looking for default files used by rootkits

* Checking for wrong file permissions for binaries

* Looking for suspected strings in LKM and KLD modules

* Looking for hidden files

* Optionally scanning within plain text and binary files

* Checking software versions

* Testing applications

Authors:
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    Michael Boelen <michael@rootkit.nl>