The growth of the web-based online advertising industry has created many new opportunities for lead generation, brand awareness, and electronic commerce for advertisers. In the online marketplace, page views, form submissions, clicks, downloads, and purchases often result in money changing hands between advertisers, ad networks, and web site publishers. Since these web-based actions have financial impact, criminals have also seeked to take advantage of new opportunities to conduct fraud against these parties with the hopes of having some money illegitimately change into their own hands. This chapter discusses some of the many ways, including using crimeware 1, that fraudsters attempt to leverage to defraud various parties involved in the online advertising marketplace. We also discuss countermeasures that ad networks have put in place to mitigate such fraud.
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