Journal article Open Access

Costly Freeware: A Systematic Analysis of Abuse in Download Portals

Richard Rivera; Platon Kotzias; Avinash Sudhodanan; Juan Caballero


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        <foaf:name>Juan Caballero</foaf:name>
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    <dct:title>Costly Freeware: A Systematic Analysis of Abuse in Download Portals</dct:title>
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    <dct:description>&lt;p&gt;Freeware is proprietary software that can be used free of charge. A popular vector for distributing freeware are download&lt;br&gt; portals, i.e., websites that index, categorize, and host programs. Download portals can be abused to distribute potentially unwanted&lt;br&gt; programs (PUP) and malware. The abuse can be due to PUP and malware authors uploading their ware, by benign freeware&lt;br&gt; authors joining as affiliate publishers of PPI services and other affiliate programs, or by malicious download portal owners. In this&lt;br&gt; work, we perform a systematic study of abuse in download portals. We build a platform to crawl download portals and apply it to&lt;br&gt; download 191K Windows freeware installers from 20 download portals. We analyze the collected installers and execute them in a&lt;br&gt; sandbox to monitor their installation. We measure an overall ratio of PUP and malware between 8% (conservative estimate) and&lt;br&gt; 26% (lax estimate). In 18 of the 20 download portals examined the amount of PUP and malware is below 9%. But, we also find&lt;br&gt; two download portals exclusively used to distribute PPI downloaders. Finally, we detail different abusive behaviors that authors of&lt;br&gt; undesirable programs use to distribute their programs through download portals.&lt;/p&gt;</dct:description>
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