This allowed it to hide behind legitimate apps. While Google has strict measures in place to check for malware such as this, the Joker managed to get past the stringent security measures by tweaking its codes. The user only gets to know of the money deduction when they are alerted about transactions on their cards. Authentications such as OTPs (one time passwords) are obtained by stealing SMS information. The malware also steals money from users by subscribing them to premium services without their consent.

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The hidden software then installs a follow-up component that steals SMS details under the guise of the host's interaction with ad websites. The app in question will already infected.

How it does is by downloading a secured configuration from a command-and-control (C&C) server in the form of an app-installation. The virus then goes past the device's security and is able to render the device useless or even steal information. Joker is a 'trojan' malware which is activated only when a user interacts with it in the form of an app installation as such. But what is the Joker malware and how does it infect your device? Here is how it does it.Ī malware is a malicious software which leaks confidential information from mobile phones or other wireless-enabled personal digital assistants. Google removed 11 apps from its Play Store for spreading the malware. It resulted in loss of sensitive information from users on whose devices the malware had infected. The 'Joker' malware grabbed headlines after it infected a plethora of devices globally.

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