Make Runtime Crypter

Hi, I just finished my own crypter, I write it in vb and it works "great". Scanning online it went from 27/35 detection to 1/35, the only problem is that it is only scantime. Practically it merges the stub, the crypted payload and a file to bind with, using a certain string as splitter, when the file is ran it splits the contents and create a temp .exe with the payload encrypted and then execute it. Logically the AV detects it and removes it before it's launched so it is pretty useless. I read about the runtime crypter that decrypt the payload directly in memory so the AV can't detect it, but I don't understand how to do it, so can someone point me in the right direction? Maybe linking me something about it, I'll appreciate. Thanks