1. Symantec/
  2. Security Response/
  3. Android.Ozotshielder


Risk Level 1: Very Low

September 14, 2011
September 15, 2011 5:32:30 AM
Infection Length:
284,586 bytes
Systems Affected:
When installing the Trojan, it will ask for one or more of the following permissions:
  • Read or write to the system settings.
  • Send SMS messages.
  • Write to external storage devices.
  • Open network connections.
  • Access information about networks.
  • Check the phone's current state.
  • Monitor incoming SMS and MMS messages.
  • Change the background wallpaper.
  • Prevent processor for sleeping or screen from dimming.
  • Change network connectivity stat.
  • Start once the device has finished booting.

The Trojan then creates services with the following names:
  • AndroidThemeService
  • BootSmsReceiverService

The Trojan also creates two icons:

It also changes the Live Wallpaper to "Beziers":

Information theft
The Trojan then collects the following information from the device:
  • IMSI
  • Phone number
  • Android OS version

The Trojan sends the gathered information to one of the following URLs:
  • [http://]transit.zhiyule.com
  • [http://]transit.5kzk.com
  • [http://]transit.5j5w.com
  • [http://]jujoy.5y3g.com

The Trojan also tries to update itself from one of these URLs.

Revenue Generation
The Trojan then prompts the user that it will send two SMS messages to premium-rate numbers:

The Trojan will send the SMS messages regardless of the option the user chooses.

The Trojan then installs an SMS monitoring service.


Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.
Writeup By: Beannie Cai and Yi Li
Summary| Technical Details| Removal

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