Netbus is a old trojan horse for windows that worked perfectly in windows *8, NT, etc. This *2 bits trojan had a lot of cool features that could be used to control de infected machine. Some of negative aspect of it is that it doesn't bypass routers, can only be used in the same network, is detected by most antivirus because it's old and uses the same registry autorun key to autostart.

The server file is called Patch.exe and after succefull installation it goes to the path
c:\windows\system*2\patch.exe

To make a undetected copy you don't need to spend a dime on crypters or other tools. Just download "Resource Hacker", edit all english texts to a diferent language or change the order of the functions and re-compile.

Pretty simple trick that will reduce detection if not make it fully undetected.