Well, if you'd like, you can hide the file inside of another executable file. Here, try
this program, but virus scan it first, i just found one that looked okay.
Just find a small game or something to send to the person, bind the RAT file to the game, and send the game to the person. Tell them they need to take their firewall down though so that the game can connect to the game server to retrieve "info".
However, i must tell you that this isn't hacking. This is a phase many people go through before they become hackers, just be aware of that, and have fun.
¯\_(ツ)_/¯ It works on my machine...