From the link above....
So far, Symantec has seen Fakedefender installed on only about 100 devices, and as stated previously, it is riddled with bugs. In addition to not working on certain models, Fakedefender also causes some infected devices to crash and doesn't allow victims to upgrade to the premium version. That suggests that the malicious app is likely still early in its development cycle.
"The thing is really all over the place," Vikram Thakur, Symantec's principal security response manager, told Ars. "Right now, it looks like it's just pure development and it made it into the wild by mistake or maybe [someone] put it out there to let the world do its quality assurance. What we've seen is definitely anything but ready for actual distribution and making money."
But as stated in the blog post, the significance of the discovery is that a malware scam that has been the bane of many computer users may soon be coming to the Android platform. Readers are reminded to think long and hard before installing apps from sources other than the official Google Play marketplace. While there's no guarantee Google Play apps will be free of malicious titles, the chances are much higher that its offerings are safe. Users should also pay close attention when installing and opening apps. Apps that ask for permission to run as an administrator should be viewed with a high degree of suspicion.
If you're going to be dumb enough to install an unknown A/V without reading reviews or seeing what users are saying on the Play store then you deserve what you get