AIDE and chkrootkit
Chkrootkit does a good job checking of every part of the system trying to search rootkits or LKM trojans. Let's download the package from the official home page of the project: www.chkrootkit.org. When I wrote this article the latest version is 0.43 that contain some improvements as new rootkits detection (AjaKit and zaRwT), new CGI backdoors detection , the new function "-n" used to skip NFS mounted directories and many minor bugs corrections. A complete list of all the trojans and CGI backdoors detected is available from the home page of the project. Once downloaded the package we are ready to compile it. Let's unpacking with the command "tar xzf chkrootkit.tar.gz" and enter in the new directory with "cd chkrootkit-0.43/". At this point give "make sense" to compile the program and after that we are really ready to lunch "./chkrootkit" to test immediately the integrity of our system. But this isn't all. Chkrootkit allow the use of other interesting functions, as showed in picture 1.
By Vincenzo Ciaglia at Linux Security.
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