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Discovered: March 09, 2011
Updated: March 10, 2011 5:41:31 AM
Also Known As: Troj/Bgserv-A [Sophos], ANDROIDOS_BGSERV.A [Trend]
Type: Trojan
Infection Length: 98,684 bytes
Systems Affected: Android

Android.Bgserv is a Trojan that opens a back door and transmits information from the device to a remote location.

Antivirus Protection Dates

  • Initial Rapid Release version March 09, 2011 revision 022
  • Latest Rapid Release version November 04, 2019 revision 019
  • Latest Daily Certified version November 04, 2019 revision 065
  • Initial Weekly Certified release date March 09, 2011

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Technical Description

The threat arrives bundled inside a legitimate application.

When the Trojan is executed, it collects the following information and saves it in the file [INSTALLATION PATH]/.hide/upload.xml:

  • IMEI
  • Phone Number
  • SMS Center
  • Install Time
  • System Version

It then uploads the collected information to the following remote site using the HTTP POST method:

Next, it receives commands from the reply to the POST and saves the commands in the following file:
[INSTALLATION PATH]/.hide/serverInfo.xml

This allows the remote attacker to send SMS messages from the compromised device.

The threat also has the capability to block incoming SMS messages.

The threat may change the access port name (APN) to the following WAP network:
Name: cmwap
APN: cmwap
Port: 80
MCC: 460
MNC: 02
Type: default

It then downloads a list of links from a remote site listed in the serverInfo.xml file and saves it as the following file:
[INSTALLATION PATH]/.hide/vedio.xml

It also downloads a file from a URL listed in the vedio.xml file and saves it as the following file:
[INSTALLATION PATH]/.hide/vedio_file.3gp

It then restores the APN to its original settings.

The Trojan logs its activities in the following file for debugging purposes:
[INSTALLATION PATH]/.hide/log.txt


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.


You may have arrived at this page either because you have been alerted by your Symantec product about this risk, or you are concerned that your device has been affected by this risk.

Install Norton Mobile Security
If you do not already have Norton Mobile Security installed on your device, please download the product from the Android marketplace .

Alternatively, you can navigate to the website from your device and download the product from there by completing the following steps:

  1. Select the 90-Day free download.
  2. Click on the Android icon to begin downloading the product.
  3. Click on Install in order to accept the permissions that are being requested by the program.
  4. Next, click Open and then Agree & Launch.

Note: The first time the product runs, you will be required to enter a code that is displayed on the screen in order to activate the product. Enter the provided code and press Submit .

Run a full system scan
Run a full system scan using Norton Mobile Security to remove this risk from the device. To do this, please perform the following actions:
  1. Navigate to the Anti-Malware tab.
  2. Click Scan Now.

Manual removal
To remove this risk manually, please perform the following actions:
  1. Open the Google Android Menu.
  2. Go to the Settings icon and select Applications.
  3. Next, click Manage.
  4. Select the application and click the Uninstall button.

Writeup By: Mario Ballano and Kaoru Hayashi