Sudden performance drops
Malware can occupy a lot of your device's processing power, resulting in severe slowdowns.
Frequent crashes and freezing
Some malware will cause your computer to freeze or crash, while other types will cause crashes by consuming too much RAM or CPU power.
ransom note
Ransomware wants you to know it's there — it'll take over your screen with a ransom note demanding payment to get your files back.
Deleted or corrupted files
Damage-oriented malware often deletes or corrupts files as part of its plan to cause as much chaos as possible.
Lots of pop-up ads
Adware's sole job is to spam you with pop-ups. Other types of malware may cause pop-up ads and alerts as well.
Browser redirects
If your browser keeps sending you to sites that you aren't trying to visit, a malware attack may have made changes to your DNS settings.
Unfamiliar apps
Malware can install additional apps on your device. If you see new programs that you didn't install yourself, it may be the result of a malware attack.