undetected server??!!

Hello everybody ...

I am posting this thread for us to share the knowledge regarding making server, (for hacking purposes) undetectable.

what I am actually asking about is, to how decode the server and change the HEX or more specifically changing the trojan signature so the AV wont be able to discover it. (what program is used to decode the server so I can manipulate the server, and how to)

I am getting dizzy trying to understand how to do so , but all what I can get online is programs that will make the server undetectable, but they never really work with the AV turned on, I mean they AV always find out about the server.

all what I need is some kind of an introductory of what is needed for the process beforehand we start working..

Hoping for your help :D
Sincerly
Thug