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This paper aims to evaluate possible threats with unofficial Android marketplaces, and geo-localize the malware distribution over three main regions: China; Europe; and Russia. It provides a comprehensive review of existing academic literature about security in Android focusing especially on malware detection systems and existing malware databases. Through the implementation of a methodology for identification of malicious applications it has been collected data revealing a 5% of them as malicious in an overall analysis. Furthermore, the analysis shown that Russia and Europe have a preponderance of generic detections and adware, while China is found to be targeted mainly by riskware and malware. [ABSTRACT FROM AUTHOR]