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Android.Frogonal

Risk Level 1: Very Low

Discovered:
June 21, 2012
Updated:
June 22, 2012 6:05:46 AM
Type:
Trojan
Infection Length:
Varies
Systems Affected:
Android
This threat typically arrives as one of several Trojanized games found on various third party markets.

Android package file

The Trojan may arrive as an APK package with one of the following names:
  • com.qhwbiw.qmg
  • org.ltv.mvek
  • rc.ooqaw.uannp
  • com.ouootnpfgw.fgg
  • com.tjpvsfhhj.asknimsefcq
  • jp.nh.d_bh.nkmabu.lbparjs.nffq
  • baltorogames.ieqjkdfuf
  • com.hiqo.joteer.urjuvpfmigvv.qrj
  • com.nlmloewfi.hkscwjjteiaq
  • com.jmcnhe.ejo.iaefipjj
  • jp.ogqceqapvdd.hwgqogd
  • au.gmc.njue.bibddtue


Permissions

When the Trojan is being installed, it requests permissions to perform the following actions:
  • Access information about networks.
  • Check the phone's current state.
  • Open network connections.
  • Access information about the WiFi state.
  • Write to external storage devices.







    Functionality
    When the Trojan is executed, it runs the original app and sends personally identifiable information (PII) to the following location:
    [http://]client.a1b2c3d4e5.in/installe[REMOVED]

    The above location is encrypted. The information that is sent includes the following:
    • Package name and version code of the Trojanized app
    • IMEI
    • IMSI
    • SIM serial number
    • Phone number
    • Device model
    • OS version
    • CPU type
    • Root access availability

    In return, it receives a command whether to install its payload or not, which consists of another package that is divided among the following files and embedded in the initial package:
    • assets/files/installer_file.00
    • assets/files/installer_file.01
    • assets/files/installer_file.02

    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: Costin Ionescu
    Summary| Technical Details| Removal

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