I scanned the QR code for an app to install it...nothing seemed to happen... after awhile I just saw displayed on the screen that my smartphone is loading some applications!
These apps continued to install automatically, then my phone storage space got filled up, my phone unresponsive, restarts by itself...too late... definite sign of malicious software infection.
The energy saver started showing in the notification bar, I checked apps installed and saw the Cleaner app, an app with the name Google having a suspicious Google Chrome-like icon... I couldn't believe that I have just opened my mobile phone up to a very stubborn Trojan with my very own hand!
In my quest to get rid of this infestation, I downloaded Eset Antivirus from the Google Play store and ran a scan afterwards, I realised from the scan that these Trojan-laced apps are installed as system apps and will not allow me to uninstall them!
I did a factory reset and behold these apps remained entrenched!
I tried other Antivirus apps without success, the ones that do detect these trojans, once I click on remove/ quarantine my phone will just reboot ...
Then I installed and ran Kaspersky... Kaspersky did the job!
Do you have stubborn Trojan, Virus on your Android device? I recommend Kaspersky 100%.