hey man,
just be aware that most currently existing RATs will be picked up by AVs due to their signatures, so really id recommend making your own. Id strongly recommend learning about diassembling, decompiling and hexing as well.
you might want to actually download a few RATs and disassemble them so as to better determine the source code, and see if you cant try to replicate it. Be aware, that all virus scanners typically make use of "signatures" which are then used to identify malicious programs. Obviously, the more you can conceal the signature of the virus, then the greater the odds that you will be successful in infiltrating the computer.
In regards to concealing the signature, there is a wide range of different methods of doing so, you can encrypt the signatures, scramble them, use an EXE binder etc all of which generally confuse the firewall/AV scanner as to the true intention of the virus.
A word of warning, dont simply use an existing virus, reason being, the signature of it will most likely already be detected. No, your best bet is to create your own virus, and then manipulate the signature details by using a hex editor. Also be aware though, that AVs and their brethren will typically "tag" certain elements and key phrases/functions in a suspicious code. For example, a word or command relating to registry may automatically be tagged, regardless of its position, or how it is used etc.
This was an issue with the MoSucker 3.0, McAfee tagged the word port throughout the source.
It is entirely possible to make a virus in Visual Basic, i dont care what some snobby coders may say, it is STILL a programming language, and if it does the job then great. Id recommend c++ though, the windows registry is founded on c++, so the possibility of actual harm is exponential. Perhaps winshell would also be an idea.......
Typically, most RATs are typically are user niveau based, witch always makes them (somehow) detectable, if you really want to come close to undetectable you should work kernel based (ntquery).
I have over 1000+ ebooks on computing so Im sure I'll have something to suit you
Just gimme me shout as to what you need.
Hope this helps.
