The next time you're cruising one of the various Android app piracy forums looking for the free crack for ROM Manager or Root Explorer, be warned that you may get more than you're looking for. A new bit of malware named DKFBootkit has been found attached to pirated apps that require root. It hooks itself into the boot sequence by altering files in the system, and can cause all sorts of problems without the user being aware. Since you think it's a legit application, you say OK when it asks for root privileges, and you are owned. It's bad news all around.
The good news is that it's easy as hell to avoid. That's the part of these types of stories that never seems to get mentioned. Use a bit of common sense -- you download a file from someone who is able to crack a legit app and defeat any license checks, and you don't think they can drop a bot or keylogger in there as well? Idiocy like this is what keeps malware alive on Windows desktops, and Android devices. Stop stealing apps, and don't be stupid enough to trust someone who steals and redistributes them. Period. Full stop.
If you didn't pay for it, chances are you'll wish you did. And you deserve it.