When a virus inserts itself into a program or file, it rewrites a portion of that software with its own code. Browser toolbars are a frequent culprit in this type of viral infection. Keep an eye out for suspicious software on your computer, especially any that you haven’t installed yourself. Viruses and other malware often install additional programs on their host machines. If you’re suffering from a sudden influx in pop-ups or in-browser ads, especially on websites that don’t usually have them, it might be due to a virus.Īpps appear on your Mac that you didn’t install. Some viruses generate revenue for the hacker by showering their victims in ads. You’re seeing a lot more ads than normal. Because viruses use a computer’s resources to replicate themselves, a sudden drop in performance can indicate an infection. Your system begins running slower than usual. There are a number of warning signs that might lead you to wonder, “Does my Mac have a virus?” Apple users experiencing any of the following symptoms may want to learn more about how to check for viruses on a Mac computer.

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