Droidsheep is an android hacking app that can be used for testing network security. But it can also be used to hack messengers and other WiFi networks. In fact, Droidsheep is actually widely used for this purpose by a breed of hackers.
This can be done by the app by using sessions. Droidsheep application hacks the session key which is used between both sides of a connection and hence can hack into any messengers.
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This app can be downloaded and then installed on any Android device. But unlike any other hacking app Droidsheep requires root access for performing. Therefore, in order to use Droidsheep, you need to root your Android device first hand.