Meh. Not really something average Joe needs to worry about. Too many security measures needs to be altered in order to make phone vulnerable, AND then one has to actively install malware from whatever source.
Sticking with Amazon Appstore, Google Play or any other reputable app store will be safe.
This thing is the equivalent of dousing your house in gasoline, then lighting a match and complaining afterwards that it burned down.
This reminds me of the article a little while ago about the vulnerability of jailbroken iPhones. Except there the "jailbroken" bit was (rightfully) included in the title. Here the security downgrading steps necessary to become infected with this thing are mentioned in the last paragraph. Maybe the title should include altered/modified/ or otherwise intentionally crippled Android phones. Just a thought of even-headedness for the OP when reporting such issues. No wonder some people think of Android as less secure, when in fact requires quite a few steps and a good amount of determination to screw- up with the default settings, followed by a suicidal will to install apps from shady sources.
I, for one, still have yet to encounter an infected phone in the wild.