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Android.Adwlauncher

Risk Level 1: Very Low

Discovered:
August 21, 2012
Updated:
August 24, 2012 8:21:10 AM
Type:
Trojan
Systems Affected:
Android
Android package file
The Trojan may arrive as a package with the following characteristics:

Package name: com.jnyl.lanucher2
Name: ADW.Launcher 2


Permissions
When the Trojan is being installed, it requests permissions to perform the following actions:
  • Access information about currently or recently running tasks
  • Access information about networks
  • Access information about the WiFi state
  • Allow access to low-level power management
  • Allow the global search system to access content provider's data
  • Allows applications to write the apn settings
  • Change network connectivity state
  • Change the background wallpaper
  • Change WiFi connectivity state
  • Check the phone's current state
  • Create new SMS messages
  • Expand or collapse the status bar
  • Initiate a phone call without using the Phone UI or requiring confirmation from the user
  • Initiate a phone call without using the Phone UI or requiring confirmation from the user
  • Make the phone vibrate
  • Manage which application can access AppWidget's data
  • Modify the system settings
  • Monitor incoming MMS messages
  • Monitor incoming SMS messages
  • Monitor incoming WAP push messages
  • Open network connections
  • Prevent processor from sleeping or screen from dimming
  • Read or write to the system settings
  • Read SMS messages on the device
  • Read user's contacts data
  • Restart packages
  • Send SMS messages
  • Set wallpaper hints
  • Start once the device has finished booting
  • Terminate background processes
  • Write to external storage devices


Installation
Once installed, the application does not display a launch icon.


Functionality
The Trojan is executed by pressing the home button.

The threat then displays a launch screen.



Next a page is displayed with the option to activate the device administrator. If this option is selected, the threat cannot be uninstalled using the application manager.



It then collects the following information:
  • IMSI
  • IMEI

The Trojan then sends an SMS message containing the above information to a premium rate number.

The threat also collects the names of all applications installed on the device and sends them to the following remote location:
[http://]a.sousoutu.net/lylys321_os/phoneServ_android/phone_getinfok[REMOVED]

It also attempts to change connection mode from WIFI to CMWAP so the user incurs data charges.

It attempts end processes related to antivirus applications.

Recommendations

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: Daniel Xiang
Summary| Technical Details| Removal

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