SymbOS.Commwarrior.F

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Discovered: May 17, 2006
Updated: February 13, 2007 12:55:29 PM
Type: Worm
Systems Affected: Symbian OS


SymbOS.Commwarrior.F is a worm that runs on Series 60 phones. It attempts to spread using Bluetooth and Multimedia Messaging Service (MMS) messages as a randomly named .sis file.

Antivirus Protection Dates

  • Initial Rapid Release version May 18, 2006
  • Latest Rapid Release version August 20, 2008 revision 017
  • Initial Daily Certified version May 18, 2006
  • Latest Daily Certified version August 20, 2008 revision 016
  • Initial Weekly Certified release date May 24, 2006

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


Technical Description



When SymbOS.Commwarrior.F is executed, it performs the following actions:

  1. Displays a dialog box to warn the user that the application may be coming from an untrusted source and may cause potential problems before the .sis file is installed.

  2. If the user clicks yes, the device displays the following message prompting the user to install the threat:

    Install
    Chatt Yahoo

  3. Creates the following files:

    • \System\apps\TTNCONTACTS\TTNCONTACTS.exe
    • \System\apps\TTNCONTACTS\RecQWRD.mdl

  4. Runs TTNCONTACTS.exe, which creates the following files on the compromised device:

    • e:\System\recogs\RecQWRD.mdl
    • e:\Sounds\Digital\RecQWRD.mdl
    • e:\Sounds\Digital\WaveEditors.exe

  5. Rebuilds a .sis file from the above files and copies it to the following location:

    e:\Sounds\Digital\Disco.mp3

  6. Searches for Bluetooth-enabled devices and attempts to send a randomly named copy of the .sis file to all devices that it finds, repeating this action every minute.

  7. Selects a contact phone number from the device's phonebook at random and sends an MMS message containing the Disco.mp3 file as an attachment. The MIME type of the attachment is application/vnd.symbian.install. The message is one of the following:

    Subject: Erotic EspaceXxX
    Message: EspaceXX te regala una, entrada ya!

    Subject: Por Ti
    Message: Por ti.Ven disfruta de la cena !!. Ven ya!

    Subject: Benitocamelas
    Message: BenitoCamelas . en Concierto!!

    Subject: Mira!!
    Message: Leslie Te Km!!. Tu si sabes!

    Subject: SORTEO
    Message: SORTEO Carrefur por Aniversari. Regal Nokias 60 ven!. Corree!

    Subject: N-GageQD!!!
    Message: Regalamos Nokias N-GageQD. Ven a Lidl!!!! 4 Unidades.

    Subject: Envia Politonos
    Message: Envia Politonos al 3343. Gratis 2!!!.

    Subject: Ruralcaja Ofrece...
    Message: RuralCaja ofrece2 anos de... Ven www.rucajas.com

    Subject: Buscamos Gente
    Message: Antena 3. Busca gente para serie TV!!!

    Subject: Estatut!!!!!
    Message: Carod Rovira es un hijo de Puta!! Cabronazo!!!!

    Subject: Zapatero vete a tu casa
    Message: El PSOE es una mierda!! 2 Telediario

    Subject: Mensaje Antena 3
    Message: Promocion Antena 3.Consigue grattis.

    Subject: Feliz Cumple!!!
    Message: Feliz Cumple!!! Ves como me acuerdo!!!

    Subject: Tkm! Amor
    Message: Less tkm!. Te quiero mucho!!

    Subject: Virutas MEX
    Message: Virutas MEX mezcla Mexicana de Limon y Peras!!!

    Subject: Nokia Tonos!
    Message: Nokia Tonos! Coleccion al 343 de ConTxTA!

    Subject: Quedamos a tomar algo?
    Message: Viva los Hacker de Valencia, hackers!! online

    Subject: Ayudanos co
    Message: ntra la drogadiccion, colabora ACDV 1 Euro.

    Subject: Me he cambiado..
    Message: Me he cambiado la direccion de email, esta

    Subject: Llamame cuando veas
    Message: Me he quedado sin Gasolina!!!

    Subject: 343.!!
    Message: SMS!!!Antena 3 lanza nuevos servicios..

    Subject: Impuestos Bajos
    Message: Hay que pagar para respirar y mear

    Subject: Movistar!
    Message: Fernando Alonso te envia una invitacion!Sr Arganda


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.


Removal


  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:

    • \System\apps\TTNCONTACTS\TTNCONTACTS.exe
    • \System\apps\TTNCONTACTS\RecQWRD.mdl

  4. Delete the following files from the device's memory card:

    • e:\System\recogs\RecQWRD.mdl
    • e:\Sounds\Digital\RecQWRD.mdl
    • e:\Sounds\Digital\WaveEditors.exe
    • e:\Sounds\Digital\Disco.mp3

  5. Exit the file manager.

  6. Restart the device.



Writeup By: Yana Liu