Threat Explorer

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Dialer.Lusval

Dialer.Lusval

Updated:
13 February 2007
Publisher:
Creanet S.A.
Risk Impact:
High
File Names:
NsUpdate.exe,multicrack.exe
Systems Affected:
Windows

Behavior


Dialer.Lusval is a dialer program that can be used to access pornographic material by dialing a high-cost number using the modem.

Symptoms


The files are detected as Dialer.Lusval.

Behavior


The most common installation method for this dialer program is through various Web sites, mainly pornographic.

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 03 December 2003
  • Latest Daily Certified version 07 May 2019 revision 008
  • Initial Weekly Certified release date 03 December 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When Dialer.Lusval is executed, it performs the following actions:
  1. Copies itself as \Program Files\<filename without .exe extension>\<filename>

    where <filename> is the name of the executed file.

  2. Copies itself as %Windir%\NsUpdate.exe.

  3. Creates shortcuts on the desktop and the Start menu to \Program Files\<filename without .exe extension>\<filename>.

  4. Adds the value:

    "NsUpdate"="%Windir%\NsUpdate.exe UPDATE"

    to the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    so that Dialer.Lusval runs when you start Windows.

  5. Adds the subkey:

    "GlobalCS"

    to the registry key:

    HKEY_CURRENT_USER\SOFTWARE\



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.Lusval.
  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.Lusval, click Delete.


    Note: If your Symantec antivirus product reports that it cannot delete a detected file, write down the path and file names. Then use Windows Explorer to locate and delete the file.

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:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  4. In the right pane, delete the value:

    "NsUpdate"="%Windir%\NsUpdate.exe UPDATE"

  5. Navigate to the key:

    HKEY_CURRENT_USER\SOFTWARE\

  6. Delete the subkey:

    "GlobalCS"

  7. Exit the Registry Editor.