Darkfloyd and Captain simply gave demonstration on DroidKungFu analysis at TVB Pearl Report (http://programme.tvb.com/news/pearlreport/video/739/125334). DroidKungFu is an Android Malicious Application indeed, it could steal all the personal data in the phone and send them back to the remote attacker's server.
Dude, please do not try to download any freeware as you like :)
Free does not mean secure. Stay alert about it.