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A new Trojan dropper dubbed xHelper was observed while slowly but steadily spreading to more and more Android devices since May, with over 32,000 smartphones and tablets having been found infected in the last four months. Trojan droppers are tools used by threat actors to deliver other more dangerous malware strains to already compromised devices, including but not limited to clicker Trojans, banking Trojans, and ransomware. xHelper, dubbed Android/Trojan.Dropper.xHelper by Malwarebytes Labs' researchers who discovered it, was initially tagged as a generic Trojan dropper only to be upgraded to the rank of a fully-fledged menace after climbing into the security vendor's top 10 most detected mobile malware in just a few months. Besides a large number of devices, it was found on, xHelper also comes with a number of other peculiarities including the fact that it spreads using DEX (Dalvik Executable) files camouflaged as JAR archives, containing compiled Android application code. This method of infecting new Android devices is quite unique given that most mobile Trojan droppers would use an APK (Android Package) bundled with an infected app, APKs which get subsequently dropped within the Assets folder and then installed and executed on the compromised smartphone or tablet. The encrypted DEX files used by xHelper as part of its infection process are first decrypted and then compiled using the dex2oat compiler tool into an ELF (Executable and Linkable Format) binary which gets executed natively by the device's processor. There's lots more posted on OUR FORUM.

 

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