Malvertising uses legitimate advertising networks to spread malicious code, often on legitimate websites. The attacks tend to have three stages: First, the attacker needs to fool the advertising network and violate their terms of service without getting caught. Effective malvertising usually offers giveaways or gift cards, which can make people click because they think theyre getting a great deal. Effective malvertisers have an advantage over legitimate advertisers: They dont have to actually deliver on the deals they promise, so they can offer fantasy products or amazing deals.”]