Threat Explorer

The Threat Explorer is a comprehensive resource consumers can turn to for daily, accurate, up-to-date information on the latest threats, risks and vulnerabilities.

Dialer.ExDialer

Dialer.ExDialer

Updated:
13 February 2007
Risk Impact:
High
File Names:
varies
Systems Affected:
Windows

Behavior


Dialer.ExDialer is a dialer program that gives the user access to premium services of a third-party Web site by dialing a high cost number using a modem.

Symptoms


Your Symantec antivirus program detects Dialer.ExDialer.

Behavior


Usually installed through a third-party Web site by embedding the executable in an .html file.

Antivirus Protection Dates

  • Initial Rapid Release version 02 October 2014 revision 022
  • Latest Rapid Release version 07 May 2019 revision 006
  • Initial Daily Certified version 30 December 2003
  • Latest Daily Certified version 07 May 2019 revision 008
  • Initial Weekly Certified release date 31 December 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When Dialer.ExDialer is activated, it performs the following actions:
  1. Moves itself to %System%\ShellExt\d.exe.


    Note: %System% is a variable. The dialer locates the System folder and copies itself to that location. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

  2. Creates the registry keys:
    • HKCU\Software\Freeware
    • HKCU\Software\Freeware\{FFB51760-344E-4FFB-BFFF-4B18C7AC1D63}
    • HKLM\Software\Microsoft\Windows\CurrentVersion\Uninstall\{CCD4F5CD-C5BC-4645-BF61-9F4EEBDD19CC}

      which holds various configuration information for the dialer.
  3. May create the registry value:

    "exDialer"="%System%\ShellExt\d.exe"

    in the registry key

    HKLM\Software\Microsoft\Windows\CurrentVersion\Run



The following instructions pertain to all Symantec antivirus products that support security risk detection.
  1. Update the definitions.
  2. Close modem connections.
  3. Uninstall the security risk.
  4. Run a full system scan.
  5. Delete values added to the registry.
For specific details on each of these steps, read the following instructions.

1. To update 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. To uninstall the security risk
This security risk includes an uninstallation applet. In order to uninstall this security risk, complete the following instructions:
  1. Click Start > Settings > Control Panel or Start > Control Panel (this varies with the operating system).

  2. In the Control Panel window, double-click Add/Remove Programs.

    Windows Me only: If you do not see the Add/Remove Programs icon, click ...view all Control Panel options.

  3. Click exDialer

    Note:
    You may need to use the scroll bar to view the whole list.

  4. Click Add/Remove, Change/Remove, or Remove (this varies with the operating system). Follow the prompts.

    Note: After running the Add/Remove programs applet, all the files may have been removed. You will want to run a full system scan to ensure that this is the case. However, it is possible that no files will be detected after using Add/Remove programs.
4. To run the scan
    Start your Symantec antivirus program, and then run a full system scan.

    If any files are detected, and depending on which software version you are using, you may see one or more of the following options:

    Note: This applies only to versions of Norton AntiVirus that support security risk detection. If you are running a version of Symantec AntiVirus Corporate Edition that supports security risk detection, and security risk detection has been enabled, you will only see a message box that gives the results of the scan. If you have questions in this situation, contact your network administrator.
    • Exclude (Not recommended): If you click this button, it will set the risk so that it is no longer detectable. That is, the antivirus program will keep the security risk on your computer and will no longer detect it to remove from your computer.

    • Ignore or Skip: This option tells the scanner to ignore the risk for this scan only. It will be detected again the next time that you run a scan.

    • Cancel: This option is new to Norton Antivirus 2005. It is used when Norton Antivirus 2005 has determined that it cannot delete a security risk. This Cancel option tells the scanner to ignore the risk for this scan only, and thus, the risk will be detected again the next time that you run a scan.

      To actually delete the security risk:
      • Click its file name (under the Filename column).
      • In the Item Information box that displays, write down the full path and file name.
      • Then use Windows Explorer to locate and delete the file.

    • Delete: This option will attempt to delete the detected files. In some cases, the scanner will not be able to do this.
      • If you see a message, "Delete Failed" (or similar message), manually delete the file.
      • Click the file name of the risk that is under the Filename column.
      • In the Item Information box that displays, write down the full path and file name.
      • Then use Windows Explorer to locate and delete the file.
5. To delete the value from the registry
Important: 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 subkeys only. Read the document: How to make a backup of the Windows registry .
  1. Click Start > Run.
  2. Type regedit

    Then click OK.

    Note: If the registry editor fails to open the risk may have modified the registry to prevent access to the registry editor. Security Response has developed a tool to resolve this problem. Download and run this tool, and then continue with the removal.
  3. Navigate to the key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  4. In the right pane, delete the value:

    "exDialer"="%system%\ShellExt\d.exe"

  5. Navigate to and delete the registry keys:
    • HKCU\Software\Freeware
    • HKCU\Software\Freeware\{FFB51760-344E-4FFB-BFFF-4B18C7AC1D63}
    • HKLM\Software\Microsoft\Windows\CurrentVersion\Uninstall\{CCD4F5CD-C5BC-4645-BF61-9F4EEBDD19CC}

  6. Exit the Registry Editor.