Help Rare 'example' toast on Samsung Galaxy

[xyz666]

Hello, a friend asked me about a strange toast on his smartphone Samsung Galaxy J1 ACE (SM-J111M). When he turns on his smartphone and opens an application or installs a new application, he sees an android toast with the word "example".

I assume it should be something about an antivirus (or a virus in question). He told me that the cell phone brings him "McAfee Security" from the factory. But even disabling it, since you can not uninstall it, the toast still appears.

Here are the screenshots he sent me:


Does anyone know what's causing it?

P.S.: I almost forgot, the smartphone it's running Android 5.1.1

EDITED: Change "notification" for "toast".

 

[scary alien]

That looks like a toast message...from what you describe, you've got an app that is monitoring various intents (system broadcast messages) and is producing that toast message when those scenarios are broadcast.

Figuring-out which app is not a simple, straightforward task, but it's likely not a system app.

I'd start by reviewing which apps are installed and maybe uninstalling the most likely candidates one at a time until the issue disappears.

 

[xyz666]

Yes, you're right it's a toast message. Sorry for having said notification. I will edit the thread title to clarify the problem.

I'll try to see if I can find out what is the problem.

 

[xyz666]

Finally I found the problem. I looked for apps that had permissions of "run at startup" and I found a MOD of the game "Cut the Rope". A game with that kind of permissions was strange to me, so i uninstalled it, restart the smartphone and everything is okay again.

The dangers of install apps from unofficial sites...

@scary alien thank you for the advice.