I first heard about this awesome app on an IRC chatroom back in the summer of 2011. This clever little app spoofs ARP replies to trick other devices on the network into thinking you are the router. WiFi Kill then stops their packets making the user think that the network has stalled.
Advantages are small but powerful. Lets say there is somebody on your network leeching your bandwidth on high definition YouTube videos or downloading the latest illegal torrent. Simply fire up the app, find their IP on the displayed list and let WiFi Kill do its job. It also works great to block people using your WiFi connection during specific hours which means you can kick your 13 year old son off your network when he should be in bed or studying.
With Android devices being capable of spoofing ARP replies that gets me thinking can it run the Karma code to become a man in the middle device. Only time will tell…
The app only works on rooted phones (Android is Linux based) because it was removed from the Android Marketplace within weeks after release.
Sett Rosenblatt from CNET has a great mini tutorial on how to root your Android Device using your Windows based operating system. Just be warned that rooting your phone does void its warranty and if something goes wrong you might end up bricking your phone turning it into something as useful as a paperweight.
Hit up the link here: http://howto.cnet.com/8301-11310_39-20054428-285/how-to-root-your-android/