Threat Explorer

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13 February 2007
Risk Impact:
File Names:
Systems Affected:


Dialer.CAPI-Anruf is a dialer program that can be used to access various Web sites by dialing a high-cost phone number using the modem. The sites that can be accessed are mostly pornographic.

This dialer is designed specifically for ISDN users and will not work with regular modems.


The files are detected as Dialer.CAPI-Anruf.


This threat was spammed as sec_update.exe, with the following email message:

Sehr geehrte Damen und Herren,
 vor kurzem haben wir festgestellt, dass sich ein neuer Virus in Umlauf befindet,
 der jedoch nicht anhand seines Dateinamens erkannt werden kann, da dieser ständig wechselt.
 Dieser Virus verteilt sich nicht über den eMail-Transfer, sondern direkt durch das Surfen auf
 Webseiten. Auf Grund dessen ist es sicherer, das erforderliche Sicherheitsupdate für
 Ihr System NICHT zum download anzubieten, sondern Ihnen per eMail zur manuellen
 Installation zukommen zu lassen.
 Wir vom Symantec - Team warnen dringend vor diesem Virus, da er nicht nur unerkannt
 in das System eindringt, sondern - sobald der Virus das System befallen hat - anfängt,
 wichtige Systemdateien von Windows bzw. Linux zu löschen.
 Wir haben ein Sicherheitsubdate entwickelt, welches das System gegen den Virus
 immunisiert. Installieren Sie das im Anhang mitgesendete Sicherheitsupdate,
 um einen Befall des Systems zu verhindern.
 Weitere Informationen erhalten Sie im Internet auf
 unserer Webseite

Antivirus Protection Dates

  • Initial Rapid Release version 02 October 2014 revision 022
  • Latest Rapid Release version 01 February 2015 revision 020
  • Initial Daily Certified version 29 October 2003
  • Latest Daily Certified version 17 January 2008 revision 033
  • Initial Weekly Certified release date 29 October 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Dialer.CAPI-Anruf uses the Common ISDN Application Programming Interface (CAPI) functionality to silenty dial premium-rate numbers from your computer.

Due to the functionality of the connection provided by CAPI, Windows does not need to provide connections to a telecommunications network.

Where possible, Dialer.CAPI_Anruf will use both ISDN channels, so that a doubling of the costs is achieved.

Dialer.CAPI-Anruf will also drop a copy of itself into the %system% folder.

The following instructions pertain to all Symantec antivirus products that support Security Risk detection.
  1. Update the definitions.
  2. Close modem connections.
  3. Run a full system scan and delete all the files detected as Dialer.CAPI-Anruf.
  4. Delete the value that was added to the registry.
For specific details on each of these steps, read the following instructions.

1. Updating the definitions
To obtain the most recent definitions, start your Symantec program and run LiveUpdate.

2. To close modem connections
This risk uses available modems to create an Internet connection, sometimes without any visible signs. In order to successfully remove this threat, ensure that all modem-based Internet connections are disconnected before proceeding. For instructions on how to do this, consult the appropriate Internet service provider, computer manufacturer, or operating system documentation.

3. Scanning for and deleting the files
  1. Start Norton AntiVirus and make sure that it is configured to scan all the files. For more information, read the document, "How to configure Norton AntiVirus to scan all files."
  2. Run a full system scan.
  3. If any files are detected as Dialer.CAPI-Anruf, click Delete.

4. Deleting the value from the registry

WARNING: Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified keys only. Read the document, "How to make a backup of the Windows registry ," for instructions.
  1. Click Start, and then click Run. (The Run dialog box appears.)
  2. Type regedit

    Then click OK. (The Registry Editor opens.)

  3. Navigate to the key:


  4. In the right pane, delete the value:


  5. Exit the Registry Editor.