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Android.Kituri

Risk Level 1: Very Low

Discovered:
June 8, 2012
Updated:
June 13, 2012 1:41:04 PM
Type:
Trojan
Infection Length:
1,771,033 bytes
Systems Affected:
Android
This threat must be manually downloaded.

Android package file

The Trojan may arrive as the following APK package:



Package name: com.kituri.activity
Version: 1.6


Permissions
When the Trojan is being installed, it requests permissions to perform the following actions:
  • Access information about networks, including Wi-Fi networks
  • Allows read-only access to phone state
  • Change network connectivity state
  • Monitor incoming SMS messages to record or perform processing on them
  • Open network sockets
  • Read SMS messages
  • Read and write to the user's contacts data
  • Receive the ACTION_BOOT_COMPLETED message that is broadcast after the system finishes booting
  • Send SMS messages
  • Use PowerManager WakeLocks to keep the processor from sleeping or the screen from dimming
  • Write SMS messages
  • Write the APN settings
  • Write to an external storage device

Functionality
When the Trojan is executed, it creates the following service:
com.kituri.tools.BootBroadcastService

The Trojan then disables Wi-Fi and uses CMWAP/CMNET instead.

Next, the Trojan connects to one of the following HTTP servers to download a configuration file:
  • [http://]222.73.127.57:10670/sp/plac[REMOVED]
  • [http://]222.73.127.57:10670/sp/sendn[REMOVED]
  • [http://]222.73.127.57:10670/sp/info[REMOVED]

Note: This server is down at the time of analysis.

The Trojan then sends an SMS message to a predetermined number contained within the configuration file so that a remote attacker can obtain the phone number of the device.

It then monitors any SMS messages that arrive from the following number, which is the MM (Mobile Market):
10658800

If a message contains the following message, the Trojan then obtains the login authentication code of the device:
Welcome to MM mobile application download service

This allows the Trojan to subscribe to and download applications on to the device.

It then blocks all SMS messages that come from 10658800 so that the user is unaware of any applications downloaded by the Trojan.

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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