According to Mikhailova, special Trojans can fit into applications that send user data to cybercriminals. Moreover, even official applications can subsequently become infected with viruses and become spyware. Thus, they can write off money.
This often happens because users give applications permissions to use the not entirely transparent Accessibility Features, which can lead to the appearance of such dangerous malware as Cloak and Dagger, Clickjackin, automatic spyware downloaders, etc. on a smartphone. Thanks to these permissions, hacker applications can sign a user’s number to receive SMS messages and other paid services that the owner of the device does not even know about.
To avoid this, you need to install antivirus software on your smartphone. This will help control the quality of Internet traffic, block threats, leaks, and protect against phishing.