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Android.Fakedefender

Risk Level 1: Very Low

Discovered:
June 2, 2013
Updated:
June 3, 2013 8:04:48 AM
Type:
Trojan
Infection Length:
1,570,098 bytes
Systems Affected:
Android
Android package file
The Trojan may arrive as a package with the following characteristics:

Package name: com.android.defender.androiddefender



Permissions
When the Trojan is being installed, it requests permissions to perform the following actions:
  • Access location information, such as Cell-ID or WiFi.
  • Access location information, such as GPS information.
  • Access information about networks.
  • Access information about the WiFi state.
  • Change network connectivity state.
  • Change Wi-Fi connectivity state.
  • Allows applications to disable the keyguard.
  • Expand or collapse the status bar.
  • Access to the list of accounts in the Accounts Service.
  • Open network connections.
  • Ends background processes.
  • Read user's contacts data.
  • Check the phone's current state.
  • Read SMS messages on the device.
  • Start once the device has finished booting.
  • Open windows.
  • Make the phone vibrate.
  • Prevent processor from sleeping or screen from dimming.
  • Create new contact data.
  • Write to external storage devices.
  • Create new SMS messages.
  • Install a shortcut.





Installation
Once installed, the application displays an icon with the text "Android Defender".




Functionality
The Trojan displays fake security alerts in an attempt to convince the user to purchase an app in order to remove non-existent malware or security risks from the device.

It also deletes all .apk files found in the following folders:
  • [EXTERNAL STORAGE MEDIA]/Download
  • /mnt/external_sd/Download
  • /mnt/extSdCard/Download

It creates the following SQLite database file:
droidbackup.db

Next, the Trojan copies all SMS messages in the device's inbox to the 'smstable' table located in the above database file.

The Trojan may display a pornographic background image when the device is locked.

It then ends the following background processes:
  • com.rechild.advancedtaskkiller
  • com.estrongs.android.pop
  • com.metago.astro
  • com.avast.android.mobilesecurity
  • com.estrongs.android.taskmanager
  • com.gau.go.launcherex.gowidget.taskmanagerex
  • com.gau.go.launcherex
  • com.rechild.advancedtaskkillerpro
  • mobi.infolife.taskmanager
  • com.rechild.advancedtaskkillerfroyo
  • com.netqin.aotkiller
  • com.arron.taskManagerFree
  • com.rhythm.hexise.task










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: Takashi Katsuki
Summary| Technical Details| Removal

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