Cybersecurity firm Malwarebytes revealed a form of Android malware that keeps returning even after performing a factory reset on a smartphone.
Malwarebytes discovered the Android trojan named the xHelper in May 2019. The malware is capable of installing itself on an Android device without notifying the owner, then receives remote commands and downloads additional malware into the infected smartphone or tablet.
Unfortunately, it appears that xHelper is still evolving. Amelia, an Android device owner, reached out to the Malwarebytes support forum to seek help for a curious case.
Amelia was able to remove two variants of xHelper and a trojan agent from her Android device through Malwarebytes’ app. However, xHelper kept coming back less than an hour after it was removed, even after Amelia performed a factory reset on her phone.
In Malwarebytes’ investigation, the first suspect for the returning xHelper was pre-installed malware, which was a possibility because Amelia’s phone was made by an unnamed, lesser-known manufacturer. However, after Amelia was guided through the process of checking if this was the case, xHelper did not go away.
Malwarebytes then noticed that the source of installation for xHelper was Google Play. When the service was deactivated, the re-infections of the malware stopped.
The firm determined that Google Play itself was not infected with malware, but it was triggering the re-installation of xHelper. They then discovered an Android application package hidden inside the phone’s files that serves as a trojan dropper. Directories and files, including the APK, remain on an Android device even after a factory reset, unlike apps, which is how xHelper keeps infecting the phone. The method for installing the APK through something triggered by Google Play, however, is still under investigation.
Malwarebytes, which detailed a step-by-step guide for removing xHelper malware, tagged Amelia’s case as a “new era in mobile malware,” as a factory reset is usually the last, but effective, option in cleaning an infected device. Fortunately, Amelia “was as persistent as xHelper itself” in searching for the truth behind the case.
Hackers are continuously evolving, taking advantage of technology and current events for their attacks. As always, people should remain vigilant against cybersecurity threats and are recommended to reach out to experts for any suspected security risks.
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February 16, 2020 at 07:28AM
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