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Mobile app stores, such as Google Play, play a vital role in the ecosystem of mobile device software distribution platforms. When users find an app of interest, they can acquire useful data from the app store to inform their decision regarding whether to install the app. This data includes ratings, reviews, number of installs, and the category of the app. The ratings and reviews are the user-generated content (UGC) that affect the reputation of an app. Therefore, miscreants can leverage such channels to conduct promotional attacks; for example, a miscreant may promote a malicious app by endowing it with a good reputation via fake ratings and reviews to encourage would-be victims to install the app. In this study, we have developed a system called PADetective that detects miscreants who are likely to be conducting promotional attacks. Using a 1723-entry labeled dataset, we demonstrate that the true positive rate of detection model is 90%, with a false positive rate of 5.8%. We then applied our system to an unlabeled dataset of 57 M reviews written by 20 M users for 1 M apps to characterize the prevalence of threats in the wild. The PADetective system detected 289 K reviewers as potential PA attackers. The detected potential PA attackers posted reviews to 136 K apps, which included 21 K malicious apps. We also report that our system can be used to identify potentially malicious apps that have not been detected by anti-virus checkers.

PADetective: A Systematic Approach to Automate Detection of Promotional Attackers in Mobile App Store