If you see a.karmagym.club alerts in your browser, then your entire PC is infected by adware. These pop-ups may come up in all widely used browsers today, such as Internet Explorer, Google Chrome, Opera and Mozilla Firefox. If you prefer to use some other browsers based on the Chromium open source project, they may be vulnerable to this attack as well. Finally, even if you use Safari browser on your Mac computer, it may also show you pop-ups from a.karmagym.club site as well. It is clear that both Mac OS and Windows operating systems are vulnerable to such attacks.