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Type:  Adware
Discovered:  01.01.1970
Updated:  13.02.2007
Affected systems:  Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT
AV Vendor:  Symantec


When Adware.Delta is executed, it performs the following actions:

  • Adds the value:

    "Delta"="random hex value"

    to the registry keys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer Registration
    HKEY_CURRENT_USER\Software\Microsoft\Internet ExplorerRegistration

  • Creates the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{1F48AA48-C53A-4E21-85E7-AC7CC6B5FFAF}

    so that it runs every time the Internet Explorer browser is opened.

  • Creates the registry key:


  • Contacts the domain, when the Internet Explorer browser is started.

    Note: At the time of this writing, the Web site link was not active.

    Removal instructions from Symantec Security Response Team

    The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

  • Disable System Restore (Windows Me/XP).
  • Update the virus definitions.
  • Run a full system scan and delete all the files detected as Adware.Delta.
  • Delete the value that was added to the registry.
    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
    Naked Security 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:
    3. To scan for and delete the infected files
  • Start your Symantec antivirus program and make sure that it is configured to scan all the files.
  • Run a full system scan.
  • If any files are detected as infected with Adware.Delta, 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.

    (After the files are deleted, you can leave the computer in Safe mode and proceed with section 4. When that is done, restart the computer in Normal mode.)
    4. 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 keys only. Read the document, "How to make a backup of the Windows registry," for instructions.
  • Click Start > Run.
  • Type regedit

    Then click OK.

  • Navigate to the keys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Registration
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Registration

    In the right pane, delete the value:

    "Delta"="random hex value"

  • Navigate to and delete the following registry keys:

    Explorer\Browser Helper Objects\{1F48AA48-C53A-4E21-85E7-AC7CC6B5FFAF}

  • Exit the Registry Editor.

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