I have seen that virus before. In this case Norton blocked it, but otherwise there would probably have been a pop-up that said that there was a problem with your computer. If you were foolish enough to click anywhere on the pop-up you would load the virus. If a strange pop up slips by Norton or Malwarebytes I never click on it. I first try to close it from the task bar, often that does not work. The next thing to do is to close it from Task Manager, doing that usually also closes your browser however.