ANDROIDOS_TROJDOWNLOADER.A

This Android malware is able to evade Google’s Bouncer.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan poses as an app supposedly used to set wallpapers. However, it downloads another malicious file in the background. It then tricks users to install the downloaded file.

It was found in Google's Play Store. However, as of this writing Google has removed the said app from Play Store.

This Trojan may be manually installed by a user.

Arrival Details

This Trojan may be manually installed by a user.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

• http://dl.dropbox.com/u/{BLOCKED}8/Activator.apk

It connects to the following URL(s) to download its configuration file:

• http://dl.dropbox.com/u/{BLOCKED}9/srv.txt

NOTES:

This Trojan poses as an app supposedly used to set wallpapers. However, it downloads another malicious .APK file in the background and tricks users to install the downloaded file.

It starts a background thread to download a configuration file from Dropbox.

Contents of the downloaded configuration file point to URL where another malicious .APK file is downloaded:

It then downloads the .APK file. Once the malicious .APK file is downloaded successfully, it launches the installer to install the downloaded file. It tricks the users into believing that the app is installing new wallpapers.

It was found in Google's Play Store. However, as of this writing Google has removed the said app from Play Store.