I used this method to get rid of them on my phone.
Malwarebytes identified four Trojans:
LockApp (which I found in a package named: com.android.provider.applock)
Calculator(pakaged as: com.anroid.calculator12)[anroid, is not misspelled btw]
The malware constantly changed it's name and icon and reinstalled itself after every deletion/disable. It even called itself cleanmaster, messages, etc. So check to see if those simple apps are oddly large or have permissions they're not supposed to. So far Malwarebytes shows no issues after I used the below method to remove them, and I hope that lasts.
I used [ pm list packages ] to show all installed apps, you don't need the OEM specification since the infection is foreign. Follow the instructions carefully and I hope it helps. (Don't forget to clear your cache, as well as disable sideloading of apps)