http://www.securelist.com/en/blog/8106/The_most_sophisticated_Android_Trojan#page_top
This is the most highly developed they've seen, exploiting apparently a couple of Android zero day vulnerabilities. It may be impossible to uninstall the app, it may spread to other devices via Bluetooth, and there's no GUI or anything to tell you it's there. FOrtunately there a very low infection rate so far, at least that Kaspersky's found.