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August 27, 2019 10:43 pm

Trojan Dropper Malware Found In CamScanner Android App With 100 Million Downloads

Kaspersky security researchers have discovered a Trojan Dropper malicious module hidden within the Android app CamScanner that's been downloaded over 100 million times on the Google Play Store. After they reported their findings, Google removed the app, but added, "it looks like the app developers got rid of the malicious code with the latest update of CamScanner." They conclude: "Keep in mind, though, that versions of the app vary for different devices, and some of them may still contain malicious code." BleepingComputer reports: As a confirmation to sudden increases in negative ratings and user reviews usually pointing out to something not exactly going right with an app, the researchers found "that the developer added an advertising library to it that contains a malicious dropper component." In this case, while CamScanner was initially a legitimate Android app using in-app purchases and ad-based monetization, "at some point, that changed, and recent versions of the app shipped with an advertising library containing a malicious module," says Kaspersky. The module dubbed Trojan-Dropper.AndroidOS.Necro.n is a Trojan Dropper, a malware strain used to download and install a Trojan Downloader on already compromised Android devices which can be employed to infect the infected smartphones or tablets with other malware. When the CamScanner app is launched on the Android device, the dropper decrypts and executes malicious code stored within a mutter.zip file discovered in the app's resources. "As a result, the owners of the module can use an infected device to their benefit in any way they see fit, from showing the victim intrusive advertising to stealing money from their mobile account by charging paid subscriptions," found the researchers.

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