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Random Android apps getting installed

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Deozaan:
Hi folks,

I recently got a hand-me-down Android device which I performed a factory reset on and then set it up how I like it.

But I've been noticing every once in a while that there are new apps installed that I never installed. Sometimes they're games, sometimes they are non-game apps. Usually they are things I've never heard of, but I've seen a few popular apps such as TikTok. In any case, they're always crap I'd never install.

I don't know if this is a "feature" like how Windows 10 will put new things in the Start menu every so often, or the perhaps more likely scenario that this device has some kind of rootkit malware on it that allows it to install apps without my permission and can survive a factory reset.

The previous owner of the device was not very tech savvy and it wouldn't surprise me if she had installed some malicious app disguised as a game from the Google Play Store which set this behavior in motion.

But I also haven't had a new Android device since 2013 so I'm not sure if this is intended device vendor behavior.

The device is a Motorola Moto Z2.

Any useful suggestions or solutions on how to stop this behavior would be appreciated.

mouser:
My Samsung Android phone has certain apps that I simply cannot delete or stop from upgrading.  Very annoying.

Deozaan:
My Samsung Android phone has certain apps that I simply cannot delete or stop from upgrading.  Very annoying.
-mouser (August 17, 2020, 02:28 PM)
--- End quote ---

This is not the same thing. This is apps that aren't there one day, and then suddenly appear the next. And I can easily uninstall them as normal. It's just that they (or others) come back again after a while.

wraith808:
Is one of the apps that you do have installed installing them? 

Deozaan:
Is one of the apps that you do have installed installing them? 
-wraith808 (August 17, 2020, 05:37 PM)
--- End quote ---

I've gone through all the apps and uninstalled or disabled everything I can that I didn't specifically ask to install or don't use. I'm certain it's nothing that I've put on the device because I've used all these same apps on other Android devices and don't get mystery installs happening on those devices.

I'm just unsure if it's some built-in Motorola software/OS customization that the vendor has hidden from me or if it's a rootkit/malware.

Actually, in either case, this behavior should be considered malware even if it was intentionally put there by the device manufacturer.

I suppose I may have to just manually download and flash the official ROM or some custom firmware to eliminate a potential rootkit.

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