In my own opinion, you should check out a bunch of different sources and write it yourself. You could always hop on Tor and find a script, but the fun part of coding is figuring out how to solve a problem using your own set of tools.
One more thing which I'm sure you know - it's completely legal to make malware as long as you don't distribute it. Have fun.
thanks for sharing!, very useful and interesting. at least I have a good point to start with