An especially sneaky type of hack is on the rise, Malvertising. Hackers can infect your computer by piggybacking on Web ads — even on trusted websites. Hackers are slipping malware into legitimate-looking online advertisements. When you visit sites that serve those ads, you’re automatically and unknowingly downloading computer viruses.
Hackers have used malvertising to steal bank account information and lock up files to hold them for ransom. You can minimize your exposure by keeping your computer and browser and browser plug-ins up to date. Your antivirus program should be up-to-date. Run a good malware software to catch want your antivirus program might miss.
For more information: Money.cnn.com