{"id":31547,"date":"2013-11-24T21:08:27","date_gmt":"2013-11-25T05:08:27","guid":{"rendered":"http:\/\/blogs.mcafee.com\/?p=31547"},"modified":"2025-06-02T03:08:58","modified_gmt":"2025-06-02T10:08:58","slug":"javascript-apps-on-google-play-steal-korean-phone-numbers","status":"publish","type":"post","link":"https:\/\/www.mcafee.com\/blogs\/other-blogs\/mcafee-labs\/javascript-apps-on-google-play-steal-korean-phone-numbers\/","title":{"rendered":"JavaScript Apps on Google Play Steal Korean Phone Numbers"},"content":{"rendered":"<p>In a <a title=\"Japanese Chat App for Android Steals Phone Numbers\" href=\"https:\/\/www.mcafee.com\/blogs\/other-blogs\/mcafee-labs\/japanese-chat-app-for-android-steals-phone-numbers\/\" target=\"_blank\" rel=\"noopener noreferrer\">recent blog<\/a>, McAfee Labs reported on suspicious JavaScript-based Android chat applications for Japanese users. These apps were found on Google Play, and steal users\u2019 phone numbers. We have now found about 120 applications that use similar, but not the same, JavaScript techniques to steal a device&#8217;s phone number. These apps seem to mainly target Korean users. These apps use a JavaScript-based hybrid mobile application development framework, Appspresso.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-3s.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-31551\" src=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-3s.png\" alt=\"axleaker-3s\" width=\"342\" height=\"1014\" srcset=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-3s.png 342w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-3s-101x300.png 101w\" sizes=\"auto, (max-width: 342px) 100vw, 342px\" \/><\/a><br \/>\nFigure 1: Examples of suspicious apps on Google Play that target Korean users.<\/p>\n<h2>The Anatomy of the Suspicious App<\/h2>\n<p>These apps appear to have been uploaded to Google Play since early November. The total number of downloads ranges from 170,000 to 640,000 so far, according to Google Play statistics. Because the user interface of these apps supports only Korean, we guess the main target of these applications is Korean users. However, we can also find these apps on Google Play Japan by searching for words related to pornography. Most of them, though not all, are related to adult content.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-31549\" src=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-1.png\" alt=\"axleaker-1\" width=\"486\" height=\"401\" srcset=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-1.png 486w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-1-300x247.png 300w\" sizes=\"auto, (max-width: 486px) 100vw, 486px\" \/><\/a><br \/>\nFigure 2: One of the suspicious apps offers (non-adult) wallpaper.<\/p>\n<p>&nbsp;<\/p>\n<p>When launched, these apps automatically retrieve the device\u2019s phone number and send it to a server managed by the developer, without any prior notice to the user. Because the use of the phone number does not seem related to the app\u2019s functionality, we can safely say they are designed to secretly collect users\u2019 phone numbers.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-31550\" src=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-2.png\" alt=\"axleaker-2\" width=\"486\" height=\"401\" srcset=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-2.png 486w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-2-300x247.png 300w\" sizes=\"auto, (max-width: 486px) 100vw, 486px\" \/><\/a><br \/>\nFigure 3: Several screens from one of the phone number-stealing Korean-language apps.<\/p>\n<p>&nbsp;<\/p>\n<p><a title=\"Appspresso\" href=\"http:\/\/appspresso.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">Appspresso<\/a>, a JavaScript-based, cross-platform hybrid mobile application development framework, is used in all of these applications. This framework enables developers to write application logic in HTML and JavaScript while using functionalities of the underlying platform, Android in this case, via JavaScript APIs. That is, the framework bridges between Java and JavaScript. This framework also allows developers to add custom plug-ins implementing additional JavaScript APIs.<\/p>\n<p>These apps implement the custom plug-in for retrieving a device\u2019s phone number, using the TelephonyManager.getLine1Number() API, and enabling their JavaScript code to use the \u201cphone\u201d interface to get the phone number. Then the JavaScript code sends the information to the developer\u2019s server, specifying it as a query parameter in the URL loaded into the custom WebView at application launch.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-4.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-31552\" src=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-4.png\" alt=\"axleaker-4\" width=\"759\" height=\"341\" srcset=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-4.png 759w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-4-300x134.png 300w\" sizes=\"auto, (max-width: 759px) 100vw, 759px\" \/><\/a><br \/>\nFigure 4: Java code for defining the plug-in\u2019s phone() method used from JavaScript.<\/p>\n<p>&nbsp;<\/p>\n<p>The Java code preprocesses the retrieved phone number only if the number starts with \u201c+82,\u201d the country code of South Korea.<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-5.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-31553\" src=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-5.png\" alt=\"axleaker-5\" width=\"547\" height=\"438\" srcset=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-5.png 547w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-5-300x240.png 300w\" sizes=\"auto, (max-width: 547px) 100vw, 547px\" \/><\/a><br \/>\nFigure 5: JavaScript code to get a phone number and send it to another server.<\/p>\n<p>&nbsp;<\/p>\n<p><a title=\"McAfee Mobile Security\" href=\"https:\/\/www.mcafeemobilesecurity.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">McAfee Mobile Security<\/a> detects these applications as Android\/AxLeaker.A.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In a recent blog, McAfee Labs reported on suspicious JavaScript-based Android chat applications for Japanese users. These apps were found&#8230;<\/p>\n","protected":false},"author":631,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[442],"tags":[37,142,214],"coauthors":[3220],"class_list":["post-31547","post","type-post","status-publish","format-standard","hentry","category-mcafee-labs","tag-android","tag-tag-identity-theft","tag-mobile-security1"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>JavaScript Apps on Google Play Steal Korean Phone Numbers | McAfee Blog<\/title>\n<meta name=\"description\" content=\"In a recent blog, McAfee Labs reported on suspicious JavaScript-based Android chat applications for Japanese users. These apps were found on Google Play,\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JavaScript Apps on Google Play Steal Korean Phone Numbers | McAfee Blog\" \/>\n<meta property=\"og:description\" content=\"In a recent blog, McAfee Labs reported on suspicious JavaScript-based Android chat applications for Japanese users. These apps were found on Google Play,\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.mcafee.com\/blogs\/other-blogs\/mcafee-labs\/javascript-apps-on-google-play-steal-korean-phone-numbers\/\" \/>\n<meta property=\"og:site_name\" content=\"McAfee Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/McAfee\/\" \/>\n<meta property=\"article:published_time\" content=\"2013-11-25T05:08:27+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-02T10:08:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-3s.png\" \/>\n\t<meta property=\"og:image:width\" content=\"342\" \/>\n\t<meta property=\"og:image:height\" content=\"1014\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Daisuke Nakajima\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@McAfee\" \/>\n<meta name=\"twitter:site\" content=\"@McAfee\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Daisuke Nakajima\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.mcafee.com\/blogs\/other-blogs\/mcafee-labs\/javascript-apps-on-google-play-steal-korean-phone-numbers\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.mcafee.com\/blogs\/other-blogs\/mcafee-labs\/javascript-apps-on-google-play-steal-korean-phone-numbers\/\"},\"author\":{\"name\":\"Daisuke Nakajima\",\"@id\":\"https:\/\/www.mcafee.com\/blogs\/#\/schema\/person\/18bbfc32a1b7bde3974191e65de956d6\"},\"headline\":\"JavaScript Apps on Google Play Steal Korean Phone Numbers\",\"datePublished\":\"2013-11-25T05:08:27+00:00\",\"dateModified\":\"2025-06-02T10:08:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.mcafee.com\/blogs\/other-blogs\/mcafee-labs\/javascript-apps-on-google-play-steal-korean-phone-numbers\/\"},\"wordCount\":444,\"publisher\":{\"@id\":\"https:\/\/www.mcafee.com\/blogs\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.mcafee.com\/blogs\/other-blogs\/mcafee-labs\/javascript-apps-on-google-play-steal-korean-phone-numbers\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-3s.png\",\"keywords\":[\"android\",\"identity theft\",\"mobile security\"],\"articleSection\":[\"McAfee Labs\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.mcafee.com\/blogs\/other-blogs\/mcafee-labs\/javascript-apps-on-google-play-steal-korean-phone-numbers\/\",\"url\":\"https:\/\/www.mcafee.com\/blogs\/other-blogs\/mcafee-labs\/javascript-apps-on-google-play-steal-korean-phone-numbers\/\",\"name\":\"JavaScript Apps on Google Play Steal Korean Phone Numbers | McAfee Blog\",\"isPartOf\":{\"@id\":\"https:\/\/www.mcafee.com\/blogs\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.mcafee.com\/blogs\/other-blogs\/mcafee-labs\/javascript-apps-on-google-play-steal-korean-phone-numbers\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.mcafee.com\/blogs\/other-blogs\/mcafee-labs\/javascript-apps-on-google-play-steal-korean-phone-numbers\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/axleaker-3s.png\",\"datePublished\":\"2013-11-25T05:08:27+00:00\",\"dateModified\":\"2025-06-02T10:08:58+00:00\",\"description\":\"In a recent blog, McAfee Labs reported on suspicious JavaScript-based Android chat applications for Japanese users. 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