Dialer.XAccess

Dialer.XAccess

Updated:
13 February 2007
Risk Impact:
High
File Names:
sysxa1981_1.00.exe
Systems Affected:
Windows

Behavior


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

Symptoms


A file is detected as Dialer.XAccess.

Behavior


Dialer.XAccess is installed when visiting pornographic Web sites.

Antivirus Protection Dates

  • Initial Rapid Release version 02 October 2014 revision 022
  • Latest Rapid Release version 02 October 2014 revision 022
  • Initial Daily Certified version 27 October 2004
  • Latest Daily Certified version 28 September 2010 revision 036
  • Initial Weekly Certified release date 27 October 2004
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When this dialer is executed, it does the following:
  1. Copies itself as %Windir%\sysxa1981_1.00.exe.

    Note: %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.

  2. Adds the value

    "x-access" = "%Windir%\sysxa1981_1.00.exe s"

    to the registry key

    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  3. Displays a dialog box.

  4. If you choose to connect, the program dials a high-cost-per-minute phone number and gives you access to pornographic material.

The most common installation method for this dialer is through Web sites that contain pornography.



  1. Update the virus definitions.
  2. Close modem connections
  3. Run a full system scan and delete all the files detected as Dialer.XAccess.
  4. Delete the key that was added to the registry.
For specific details on each of these steps, read the following instructions.

1. Updating the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:
  • Running LiveUpdate, which is the easiest way to obtain virus definitions: These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to the Virus Definitions (LiveUpdate).
  • Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to the Virus Definitions (Intelligent Updater).

    The Intelligent Updater virus definitions are available: Read "How to update virus definition files using the Intelligent Updater" for detailed instructions.

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 infected 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 infected with Dialer.XAccess, click Delete.
  4. Delete the %System%\Windialup folder.

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.


Note: This is done to make sure that all the keys are removed. They may not be there if the uninstaller removed them.

  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 and delete the key:

    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\x-access

  4. Exit the Registry Editor.