How to protect yourself from spam in the "shutter"?

Question

Android

The bottom line is this: there are almost no third-party applications, and I have not encountered a similar phenomenon before. A WiFi network was connected, and at some point some unfamiliar icon appeared in the upper status panel (where all the icons, signal strength, clock, etc.), and a spam message with the same icon appeared in the "shutter", and every time this spam message reappeared in the blind, an attempt was made to launch another not installed application.
The question is:
How is this spam mechanism implemented?
How to protect yourself from spam in the "shutter"?

Answer 1

a long tap and we see the author of which application has connected an advertising SDK dabbling in such a bad
demolition