Malicious crowdsourcing, also known as crowdtur\ufb01ng, has become an important security problem. However, detecting accounts performing crowdtur\ufb01ng tasks is challenging because human workers manage the crowdtur\ufb01ng accounts such that their characteristics are similar with the characteristics of normal accounts. In this paper, we propose a novel crowdtur\ufb01ng detection method, called CrowdTarget, that aims to detect target objects of crowdtur\ufb01ng tasks (e.g., post, page, and URL) not accounts performing the tasks. We identify that the manipulation patterns of target objects by crowdtur\ufb01ng workers are unique features to distinguish them from normal objects. We apply CrowdTarget to detect collusion-based crowdtur\ufb01ng services to manipulate account popularity on Twitter with arti\ufb01cial retweets. Evaluation results show that CrowdTarget can accurately distinguish tweets receiving crowdtur\ufb01ng retweets from normal tweets. When we \ufb01x the false-positive rate at 0.01, the best truepositive rate is up to 0.98.<\/p>\n","protected":false},"excerpt":{"rendered":"
Malicious crowdsourcing, also known as crowdtur\ufb01ng, has become an important security problem. However, detecting accounts performing crowdtur\ufb01ng tasks is challenging because human workers manage the crowdtur\ufb01ng accounts such that their characteristics are similar with the characteristics of normal accounts. In this paper, we propose a novel crowdtur\ufb01ng detection method, called CrowdTarget, that aims to detect […]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":null,"msr_publishername":"","msr_publisher_other":"","msr_booktitle":"","msr_chapter":"","msr_edition":"","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"","msr_journal":"","msr_number":"","msr_organization":"","msr_pages_string":"","msr_page_range_start":"","msr_page_range_end":"","msr_series":"","msr_volume":"","msr_copyright":"","msr_conference_name":"22nd ACM Conference on Computer and Communications Security (CCS 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