One day while reading a mail list for the Linux Users Group in my hometown I discovered a call for help. It was a posting from a novice Linux user with a disturbing issue. While doing some routine checks on a Linux system, he found a user that had been added to the system with the user id of 0 (root). His first thought was that it might be a rootkit. He wanted to know what he could do to verify it was a rootkit and how to remove it from the system. He further asked for suggestions on preventative measures to ensure this kind of attack does not reoccur. That situation prompted me to write this paper to an understanding of rootkits and its effects. This paper will also discuss how to monitor for a rootkit, and the steps that need to be taken to remove one.
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