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Android.Adrd

Risk Level 1: Very Low

Discovered:
February 15, 2011
Updated:
February 15, 2011 3:20:46 PM
Type:
Trojan
Infection Length:
570,420 bytes
Systems Affected:
Android
This threat has been injected into legitimate applications for the Android device. The author of the threat downloads an application from a marketplace, modifies the legitimate application, and then puts it back on the marketplace.

When the Trojan has been installed on a compromised device, it executes itself when one of the following conditions has been met:
  • Twelve hours have passed since the OS started
  • Network connectivity changed, e.g. the device lost connectivity to a network and it was re-established
  • The device receives a phone call

The Trojan then attempts to steal the following information from the compromised device:
  • 3gnet
  • 3gwap
  • APN
  • cmnet
  • cmwap
  • Hardware information
  • IMEI
  • IMSI
  • Network connectivity
  • uninet
  • uniwap
  • Wifi


Next, the Trojan encrypts the stolen information and may send it through a local proxy to one of the following remote locations:
  • [http://]adrd.taxuan.net/index[REMOVED]
  • [http://]adrd.xiaxiab.com/pic.[REMOVED]

It also receives search parameters from the above URLs. The Trojan then uses the obtained parameters to silently issue multiple HTTP search requests to the following location:
wap.baidu.com/s?word=[ENCODED SEARCH STRING]&vit=uni&from=[ID]

The purpose of these search requests is to increase site rankings for a website.

It may download an updated version of itself and save it to the following location:
sdcard/uc/myupdate.apk

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: Mario Ballano and Takashi Katsuki
Summary| Technical Details| Removal

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