Dialer.Postbas

Dialer.Postbas

Updated:
February 13, 2007
Publisher:
Dialer.DialerAccess.com
Risk Impact:
High
File Names:
dialer.exe
Systems Affected:
Windows

Behavior


Dialer.Postbas is a dialer application that can be used to access various material by dialling high-cost telephone numbers using a modem. Most of the material that can be accessed is pornographic.

Symptoms


The file is detected as Dialer.Postbas

Behavior


The dialer has to be manually installed by visiting a participating Web site.

Antivirus Protection Dates

  • Initial Rapid Release version October 02, 2014 revision 022
  • Latest Rapid Release version October 02, 2014 revision 022
  • Initial Daily Certified version December 08, 2004
  • Latest Daily Certified version January 17, 2008 revision 033
  • Initial Weekly Certified release date December 08, 2004
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When Dialer.Postbas is executed, it does following:
  1. Creates the file C:\dialler.log.

  2. Copies itself to the Desktop as FuckSite.exe.

  3. Adds the following registry key:

    HKEY_CURRENT_USER\Software\Coulomb

    to register the software on the computer.

  4. Added the value:

    "[path to dialer]" = "dialler"

    to the registry key:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ShellNoRoam\MUICache



The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.
  1. Disable System Restore (Windows Me/XP).
  2. Update the virus definitions.
  3. Close modem connections
  4. Run a full system scan and delete all the files detected as Dialer.Postbas.
  5. Delete the values from the registry.
  6. Delete files added by the threat.

For specific details on each of these steps, read the following instructions.

1. To disable System Restore (Windows Me/XP)
If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.

For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:
Note:
When you are completely finished with the removal procedure and are satisfied that the threat has been removed, re-enable System Restore by following the instructions in the aforementioned documents.

For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article, "Antivirus Tools Cannot Clean Infected Files in the _Restore Folder ," Article ID: Q263455.


2. To update 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 daily. 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.

3. 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.

4. To scan for and delete the infected files
  1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
  2. Run a full system scan.
  3. If any files are detected as infected with Dialer.Postbas, click Delete.

    Note:
    If your Symantec antivirus product reports that it cannot delete an infected file, Windows may be using the file. To fix this, run the scan in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode." Once you have restarted in Safe mode, run the scan again.

    When all the infected files have been deleted, restart the computer in Normal mode.

5. To delete the values 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 keys only. Read the document, "How to make a backup of the Windows registry ," for instructions.
  1. Click Start > Run.
  2. Type regedit

    Then click OK.

  3. Navigate to and delete the key:

    HKEY_CURRENT_USER\Software\Coulomb

  4. Navigate to the key:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ShellNoRoam\MUICache

  5. In the right pane, delete the value:

    "[path to dialer]" = "dialler"

  6. Exit the Registry Editor.

6. To delete files added by the threat.

Navigate to and delete the file C:\dialler.log


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