"This document describes a new syscall hooking technique for
Linux systems and exposes how it can be implemented as part of a
virus or a backdoor in order to take full control over an userland
application. Although there are some well- known methods for
hooking functions, they are mostly based on the ELF format itself.
This technique is focused on thoses pieces of code that are
externally called by the main program and invoke a system call or
"A simple implementation of this hooking mechanism has been
developed as a result of the research and it is included with the
article. This code provided does not have all the features you wish
but includes the required ones, is not a real backdoor but a simple
proof of concept, perfect to write your own one..."