SymbOS.Cardtrp.N

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Discovered: December 14, 2005
Updated: February 13, 2007 12:50:08 PM
Type: Trojan Horse
Systems Affected: EPOC



SymbOS.Cardtrp.N, a minor variant of SymbOS.Cardtrp.M , is a Trojan horse that runs on the Symbian OS, which is used as the operating system for Nokia Series 60 cellular telephones. It disables some applications installed on the device and drops several threats onto the device's memory card, which can compromise computers running Windows.

SymbOS.Cardtrp.N reportedly arrives as Patch__opera_8_+_Google.sis.

Antivirus Protection Dates

  • Initial Rapid Release version December 15, 2005
  • Latest Rapid Release version August 20, 2008 revision 017
  • Initial Daily Certified version December 15, 2005
  • Latest Daily Certified version August 20, 2008 revision 016
  • Initial Weekly Certified release date December 21, 2005

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Writeup By: Yana Liu

Discovered: December 14, 2005
Updated: February 13, 2007 12:50:08 PM
Type: Trojan Horse
Systems Affected: EPOC


When SymbOS.Cardtrp.N is executed, it performs the following actions:

  1. Copies itself as the following file:

    Patch__opera_8_+_Google.sis

    Note: If a user opens this file, the device Installer will display a dialog to warn the user that the application may be coming from an untrusted source and may cause potential problems.

  2. Displays the following message prompting the user to install the .sis file:

    Install
    Patch  opera 8 + Google

  3. Displays the following message during installation:

    Internet patch for Symbian Opera V8 Browser featuring Google Search Engine & Opera Guard.Opera Guard is also bundle with Antivirus free Download,for more information please go to opera.com\opera8symbian\OperaGuard

  4. Drops the following files to disable various applications on the compromised device:

    • C:\Disinfector
    • C:\system\apps\Anti-Virus\admin.pub
    • C:\system\apps\AntiVirus\AVServer.exe
    • C:\system\apps\AntiVirus\AntiVirus.app
    • C:\system\apps\AppMngr\AppMngr.app
    • C:\system\apps\Browser\Browser.app
    • C:\system\apps\Disinfect\Disinfect.app
    • C:\system\apps\Disinfector\Disinfector.rsc
    • C:\system\apps\Disinfector\last.vdb
    • C:\system\apps\Disinfector\mdkernel32.exe
    • C:\system\apps\EVS\EVS.aif
    • C:\system\apps\FCommwarrior\FCommwarrior.app
    • C:\system\apps\FileManager\FileManager.app
    • C:\system\apps\KLAntivirus\Engine.exe
    • C:\system\apps\KLAntivirus\KLAntivirus.app
    • C:\system\apps\MAV\MAV.app
    • C:\system\apps\MCE\MCE.app
    • C:\system\apps\MMCApp\MMCApp.app
    • C:\system\apps\MediaGallery\MediaGallery.app
    • C:\system\apps\MobileSecurityAu\MobileSecurityAu.app
    • C:\system\apps\mobilesecurity\MobileSecurity.app
    • C:\system\apps\PhoneBook\PhoneBook.app
    • C:\system\apps\RealPlayer\RealPlayer.app
    • C:\system\apps\virusguard\VirusGuard.aif
    • C:\system\recogs\mdrec32.mdl

  5. Drops the following files to the compromised device's memory card:

    • E:\autorun.inf
    • E:\f-secure.ico
    • E:\F-Secure utility Help.lnk, which is a shortcut linking to F:\nokia\B_S.bat
    • E:\F-secure Utility.lnk, which is a shortcut linking to F:\system\F-Secure.bat
    • E:\Games.exe, which is a Trojan Horse
    • E:\nokia\'.exe, which is Trojan.Oxtic
    • E:\nokia\B_S.bat, which are batch files running Trojan.Oxtic and W32.Rontokbro@mm
    • E:\nokia\TSG.exe, which is W32.Rontokbro@mm
    • E:\system.exe, which is W32.Rontokbro@mm
    • E:\system\apps.exe, which is W32.Rontokbro@mm
    • E:\system\apps\Disinfect\Disinfect.rsc
    • E:\system\apps\EVS\exovirusstop.mbm
    • E:\system\apps\FCommwarrior\FCommwarrior.rsc
    • E:\system\apps\FExplorer\FExplorer.App
    • E:\system\apps\File\File.App
    • E:\system\apps\MAV\MAV.mbm
    • E:\system\apps\opera\blank.gif
    • E:\system\apps\opera\comment.htt, which is a JS.Exception.Exploit
    • E:\system\apps\opera\community.gif
    • E:\system\apps\opera\community_on.gif
    • E:\system\apps\opera\connect.gif
    • E:\system\apps\opera\connect_on.gif
    • E:\system\apps\opera\drive.gif
    • E:\system\apps\opera\file.gif
    • E:\system\apps\opera\folder.gif
    • E:\system\apps\opera\Folder 2.htt, which is VBS.Soraci
    • E:\system\apps\opera\google 2.GIF
    • E:\system\apps\opera\help.gif
    • E:\system\apps\opera\help60.css
    • E:\system\apps\opera\help_on.gif
    • E:\system\apps\opera\HELP\Patch for Security reason.html
    • E:\system\apps\opera\HELP\bul.html
    • E:\system\apps\opera\HELP\connect.html
    • E:\system\apps\opera\HELP\f-secure.html
    • E:\system\apps\opera\HELP\home.html
    • E:\system\apps\opera\HELP\index.html
    • E:\system\apps\opera\HELP\keypad.html
    • E:\system\apps\opera\HELP\menus.html
    • E:\system\apps\opera\HELP\opera\542526.GIF
    • E:\system\apps\opera\HELP\opera\F-secure Antivirus.sis, which is SymbOS.Doomboot.R
    • E:\system\apps\opera\HELP\opera\Norton Antivirus symbian V1.0.SIS, which is SymbOS.Cabir.W
    • E:\system\apps\opera\HELP\opera\Opera Antispyware.sis, which is SymbOS.Cardtrp.M
    • E:\system\apps\opera\HELP\opera\blank2.jpg
    • E:\system\apps\opera\HELP\opera\o.gif
    • E:\system\apps\opera\HELP\opera\p_t.gif
    • E:\system\apps\opera\HELP\opera\p_t_002.gif
    • E:\system\apps\opera\HELP\settings.html
    • E:\system\apps\opera\HELP\standards.html
    • E:\system\apps\opera\HELP\start.html
    • E:\system\apps\opera\HELP\troubleshoot.html
    • E:\system\apps\opera\home.css
    • E:\system\apps\opera\home.png
    • E:\system\apps\opera\input.ini
    • E:\system\apps\opera\keypad.gif
    • E:\system\apps\opera\keypad_on.gif
    • E:\system\apps\opera\link.gif
    • E:\system\apps\opera\portal.gif
    • E:\system\apps\opera\portal_on.gif
    • E:\system\apps\opera\start.gif
    • E:\system\apps\opera\start_on.gif
    • E:\system\apps\opera\Stop.GIF
    • E:\system\apps\opera\wml.css
    • E:\system\apps\SystemExplorer\SystemExplorer.App
    • E:\system\apps\virusguard\VirusGuard.mbm
    • E:\system\F-Secure.bat, which is a Trojan Horse
    • E:\system\MISS_u, which is a Trojan Horse
    • E:\system\recogs\FSkulls.mdl
    • E:\system\recogs\Flocknut.mdl
    • E:\videos\Bali Bomb Movie.rm.exe, which is a Trojan Horse

      Note:
    • The dropped corrupted system components may prevent the compromised device from restarting.
    • It is important to note that none of the dropped files are from F-Secure, even though some files dropped to the memory card are displayed with F-Secure icons.
    • The dropped HTML files are modified version of Opera, which attempt to fool the user to install the dropped Symbian malware SIS files.

  6. Creates an autorun file on E drive, which tries to run games.exe if the memory card is inserted into a Windows computer. The file games.exe is a Trojan horse.

  7. Uses the same image of the icon for the dropped W32.Rontokbro@mm files as the icon for the System folder on the memory card. When browsing the memory card on a Windows computer, the worm can be executed if a user attempts to view this folder by clicking on the icon.

  8. The following file is created:

    \system\install\Patch__opera_8_+_Google.sis

    Note: This file is actually created by the Installer, not the threat.


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: Yana Liu

Discovered: December 14, 2005
Updated: February 13, 2007 12:50:08 PM
Type: Trojan Horse
Systems Affected: EPOC


  1. Install a file manager program on the device.

  2. Enable the option to view the files in the system folder.

  3. Delete the following malicious files:

    • Patch__opera_8_+_Google.sis
    • \system\install\Patch__opera_8_+_Google.sis

  4. Delete the following files and reinstall the overwritten applications if necessary:

    • C:\Disinfector
    • C:\system\apps\Anti-Virus\admin.pub
    • C:\system\apps\AntiVirus\AVServer.exe
    • C:\system\apps\AntiVirus\AntiVirus.app
    • C:\system\apps\AppMngr\AppMngr.app
    • C:\system\apps\Browser\Browser.app
    • C:\system\apps\Disinfect\Disinfect.app
    • C:\system\apps\Disinfector\Disinfector.rsc
    • C:\system\apps\Disinfector\last.vdb
    • C:\system\apps\Disinfector\mdkernel32.exe
    • C:\system\apps\EVS\EVS.aif
    • C:\system\apps\FCommwarrior\FCommwarrior.app
    • C:\system\apps\FileManager\FileManager.app
    • C:\system\apps\KLAntivirus\Engine.exe
    • C:\system\apps\KLAntivirus\KLAntivirus.app
    • C:\system\apps\MAV\MAV.app
    • C:\system\apps\MCE\MCE.app
    • C:\system\apps\MMCApp\MMCApp.app
    • C:\system\apps\MediaGallery\MediaGallery.app
    • C:\system\apps\MobileSecurityAu\MobileSecurityAu.app
    • C:\system\apps\mobilesecurity\MobileSecurity.app
    • C:\system\apps\PhoneBook\PhoneBook.app
    • C:\system\apps\RealPlayer\RealPlayer.app
    • C:\system\apps\virusguard\VirusGuard.aif
    • C:\system\recogs\mdrec32.mdl
    • E:\autorun.inf
    • E:\f-secure.ico
    • E:\F-Secure utility Help.lnk
    • E:\F-secure Utility.lnk
    • E:\Games.exe
    • E:\nokia\'.exe
    • E:\nokia\B_S.bat
    • E:\nokia\TSG.exe
    • E:\system.exe
    • E:\system\apps.exe
    • E:\system\apps\Disinfect\Disinfect.rsc
    • E:\system\apps\EVS\exovirusstop.mbm
    • E:\system\apps\FCommwarrior\FCommwarrior.rsc
    • E:\system\apps\FExplorer\FExplorer.App
    • E:\system\apps\File\File.App
    • E:\system\apps\MAV\MAV.mbm
    • E:\system\apps\opera\blank.gif
    • E:\system\apps\opera\comment.htt
    • E:\system\apps\opera\community.gif
    • E:\system\apps\opera\community_on.gif
    • E:\system\apps\opera\connect.gif
    • E:\system\apps\opera\connect_on.gif
    • E:\system\apps\opera\drive.gif
    • E:\system\apps\opera\file.gif
    • E:\system\apps\opera\folder.gif
    • E:\system\apps\opera\Folder 2.htt
    • E:\system\apps\opera\google 2.GIF
    • E:\system\apps\opera\help.gif
    • E:\system\apps\opera\help60.css
    • E:\system\apps\opera\help_on.gif
    • E:\system\apps\opera\HELP\Patch for Security reason.html
    • E:\system\apps\opera\HELP\bul.html
    • E:\system\apps\opera\HELP\connect.html
    • E:\system\apps\opera\HELP\f-secure.html
    • E:\system\apps\opera\HELP\home.html
    • E:\system\apps\opera\HELP\index.html
    • E:\system\apps\opera\HELP\keypad.html
    • E:\system\apps\opera\HELP\menus.html
    • E:\system\apps\opera\HELP\opera\542526.GIF
    • E:\system\apps\opera\HELP\opera\F-secure Antivirus.sis
    • E:\system\apps\opera\HELP\opera\Norton Antivirus symbian V1.0.SIS
    • E:\system\apps\opera\HELP\opera\Opera Antispyware.sis
    • E:\system\apps\opera\HELP\opera\blank2.jpg
    • E:\system\apps\opera\HELP\opera\o.gif
    • E:\system\apps\opera\HELP\opera\p_t.gif
    • E:\system\apps\opera\HELP\opera\p_t_002.gif
    • E:\system\apps\opera\HELP\settings.html
    • E:\system\apps\opera\HELP\standards.html
    • E:\system\apps\opera\HELP\start.html
    • E:\system\apps\opera\HELP\troubleshoot.html
    • E:\system\apps\opera\home.css
    • E:\system\apps\opera\home.png
    • E:\system\apps\opera\input.ini
    • E:\system\apps\opera\keypad.gif
    • E:\system\apps\opera\keypad_on.gif
    • E:\system\apps\opera\link.gif
    • E:\system\apps\opera\portal.gif
    • E:\system\apps\opera\portal_on.gif
    • E:\system\apps\opera\start.gif
    • E:\system\apps\opera\start_on.gif
    • E:\system\apps\opera\Stop.GIF
    • E:\system\apps\opera\wml.css
    • E:\system\apps\SystemExplorer\SystemExplorer.App
    • E:\system\apps\virusguard\VirusGuard.mbm
    • E:\system\F-Secure.bat
    • E:\system\MISS_u
    • E:\system\recogs\FSkulls.mdl
    • E:\system\recogs\Flocknut.mdl
    • E:\videos\Bali Bomb Movie.rm.exe

  5. Exit the file manager.


Writeup By: Yana Liu