Cybercriminals have designed thousands of websites like Concerss.online to send unwanted advertisements to users' computers or mobile devices directly. Concerss.online uses a browser-based tactic and a standard social engineering technique to get browser notifications approval from its visitors. When visited, the malicious page displays a fake CAPTCHA-verification test for bots:
'Concerss.online wants to Show notifications
Click Allow to confirm that you are not a robot!'
Users who fall into the trap and hit the 'Allow' button actually subscribe to the push- notifications of this website, giving Concerss.online permission to show them advertisements and other commercial content from third-parties. All of these pop-ups can show up on the screen even if no browser is running, and they typically contain potentially harmful links that redirect the user to pages with adult content, online gaming websites, or various dubious pages for fake/pirated software and PUPs.
You can delete Concerss. online's permission to send notifications from your browser's settings. However, you also should scan your PC for adware and browser hijackers, if your browser launches websites like Concerss.online automatically, especially. PUPs have many threatening features that can lead to privacy issues and financial losses; therefore, they should be removed after detection immediately.