<a href="http://www.secureworks.com/cyber-threat-intelligence/threats/stels-android-trojan-malware-analysis/" rel="nofollow">http://www.secureworks.com/cyber-threat-intelligence/threats...</a><p>The original study.
Btw how many users, actually allow sideloading?
"In addition, because the application does not originate from the official Google Play app store, a user has to enable the "Unknown Sources (Allow installation of non-Market applications)" option in the Security settings."