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The most dangerous threats for mobile devices are those that penetrate the firmware and system areas. The main signs that malicious behaviour is occurring in the system area are as follows:
! In such situations, due to the specific features of the Android OS, it's impossible to employ the standard features of ANY anti-virus to neutralise Trojans because, just like any other application, an anti-virus installed on a non-root device does not have administrative privileges: Dr.Web can detect malicious programs that get into the Android system directory, but it is not authorised to remove them.
To close firmware vulnerabilities and neutralise threats in /system, you can do the following:
! In some cases, configuring root access may lead to the device manufacturer denying to provide you with warrantied maintenance.
Make a backup of all user data; do a reset to the factory settings; and install new manufacturer-provided firmware that has had the Trojan removed from it. You may need to wait for an update, depending on how much support the manufacturer provides.
! If you are not provided with the firmware, your best course of action is to return the device you purchased to the seller. You should NEVER USE this device.
We also recommend that you read the Anti-virus Times issue dedicated to this topic — "A fish rots from the head down..." Please refer to the issue "Firmly rooted" to know how Trojans can find their way into firmware.