Bad, bad ads
Did you know that attackers can inject malicious code or malware-filled ads into legit online advertising networks and websites? This tactic is called malvertising and it can get your computer infected with all sorts of malware, Trojans, and so on.
How it happens: you browse your favorite website at FavoriteWebsite.com and there are many ads on it. But one is infected. The malicious code in the ad will search for vulnera-bilities in your system. If it finds one (and it’s not difficult to do so), it’ll infect your computer with malware.
What to do?
• Use an adblocker.
• Use a reliable antivirus.
• Use protection against attacks that antivirus can’t block.
Credit : https://heimdalsecurity.com