SymbOS.Commwarrior.M

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Discovered: June 22, 2006
Updated: February 13, 2007 12:56:41 PM
Also Known As: Commwarrior.N [F-Secure]
Type: Worm
Systems Affected: Symbian OS



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

Antivirus Protection Dates

  • Initial Rapid Release version April 22, 2016 revision 051
  • Latest Rapid Release version September 01, 2017 revision 002
  • Initial Daily Certified version April 23, 2016 revision 007
  • Latest Daily Certified version September 01, 2017 revision 008
  • Initial Weekly Certified release date June 28, 2006

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

Writeup By: Yana Liu

Discovered: June 22, 2006
Updated: February 13, 2007 12:56:41 PM
Also Known As: Commwarrior.N [F-Secure]
Type: Worm
Systems Affected: Symbian OS



The Trojan reportedly arrives as a randomly named .sis file.

Before the .sis file is installed, the phone installer displays a dialog box to warn the user that the application may be coming from an untrusted source and may cause potential problems. If the user clicks yes, the device displays the following message prompting the user to install the threat:

Install
NortonPro.:

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

  1. Creates the following files:

    • [DRIVELETTER]\system\apps\NortonDatas\Firewallpro.exe (A copy of SymbOS.Commwarrior.M)
    • [DRIVELETTER]\system\apps\NortonDatas\Protect.mdl

  2. Runs Firewallpro.exe, which creates the following files on the compromised device's memory card:

    • e:\System\recogs\Protect.mdl
    • e:\System\systems\Protect.mdl
    • e:\System\systems\Firewallpro.exe

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

    e:\System\systems\Read!.sis

  4. Searches for Bluetooth-enabled devices and attempts to send a randomly named copy of the .sis file to all devices that it finds. The worm repeats this action every minute.

  5. Randomly selects a contact phone number from the device's phonebook and sends an MMS message containing the Read!.sis file as an attachment. The MIME type of the attachment is application/vnd.symbian.install. The message is one of the following:

    Subject: Norton AntiVirus
    Message: Instalacion paramoviles,instalar ya!

    Subject: Paulina
    Message: Nuevo Antivirus para los Nokia s60s. Instala

    Subject: Quieres Reirte
    Message: Todos vendemos. Gracias Maria!

    Subject: Deejay
    Message: Conseguir eso.. Maldito Sea!

    Subject: HP-CITY
    Message: Veroo eres un zorron, guarrita. Instalalo si eres tu. Instala!

    Subject: Mis Albumes
    Message: Maria! Traeme las bragas de tu madre!!!!! Solo Nokia.

    Subject: Sonitonos Nokia
    Message: Politono Popcorn anuncio renault clio

    Subject: Telefonica Anuncia.
    Message: Vodafone y Amenase fusionan. Compra un PpPpc.com

    Subject: A mi novia XXXX
    Message: Solo trabajemos 6 horas diarias .....!

    Subject: Se busca gente
    Message: Manda tu curriculum a esta direcciony llamaran!

    Subject: Antena 3 y Telecincoven
    Message: Diapositiva PowerPoint ensymbian.com

    Subject: Mi e-mail es este
    Message: Jorge y yo nos casamos en 2 meses!!.

    Subject: Feliz Cumple!!!
    Message: Felicidades!!!! Tienes una postal aki!

    Subject: Amor Libre!
    Message: Descarga nuevos sonitonos aqui!

    Subject: AmorVirtual
    Message: Mp3 Player para Nokia series 60. Instalalo yaa!

    Subject: Mi tema erotico
    Message: Coleccion de mis fotoalbum fallas 2006!!!

    Subject: Quedamos a tomar algo?
    Message: Viva las fallas de Valencia, mascletas online

    Subject: Ayudanos, mo
    Message: vilforum,todo sobre movilesy demas......com

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

    Subject: Llamame cuando veas
    Message: Problema de bateria en Nokia!

    Subject: Mira!!
    Message: Ole!!!Universidad de Madrid y Valencia.

    Subject: Nuevas Tiendass
    Message: Hay que pagar para respirar y mear

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

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: June 22, 2006
Updated: February 13, 2007 12:56:41 PM
Also Known As: Commwarrior.N [F-Secure]
Type: Worm
Systems Affected: Symbian OS


  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:

    • [DRIVELETTER]\system\apps\NortonDatas\Firewallpro.exe
    • [DRIVELETTER]\system\apps\NortonDatas\Protect.mdl

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

    • e:\System\recogs\Protect.mdl
    • e:\System\systems\Protect.mdl
    • e:\System\systems\Firewallpro.exe
    • e:\System\systems\Read!.sis

  5. Exit the file manager.

  6. Restart the device.


Writeup By: Yana Liu