Malicious ads, known as malvertising, are tempting visitors into trusted domains that have been hacked and infected with ransomware. These ads, discovered by Cisco Systems®, can be found on sites associated with Facebook®, Disney®, the Guardian© newspaper and more. Visitors clicking on tampered ads are unknowingly redirected to malware-infected sites that eventually invades their computers, encrypts their files and demands payment within a specified amount of time to decrypt them.