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Adware.NetOptimizer

Adware.NetOptimizer

Updated:
February 13, 2007
Publisher:
Avenue Media
Risk Impact:
Medium
File Names:
ioptiXXX.dll nemXXX.dll wsemXXX.dll optimize.exe optimizeXXX.exe actalert.exe
Systems Affected:
Windows

Behavior


Adware.NetOptimizer is a program that creates a connection to a server from which it downloads and displays advertisements.

Note: Definitions prior to March 31, 2005 may detect this threat as Adware.NetOptimizer.B.

Symptoms


The files are detected as Adware.NetOptimizer. Pop-up advertisements are displayed on the computer.

Behavior


This adware program must be manually installed. However, there are several known programs that also install Adware.NetOptimizer.

Antivirus Protection Dates

  • Initial Rapid Release version October 02, 2014 revision 022
  • Latest Rapid Release version March 23, 2017 revision 037
  • Initial Daily Certified version September 16, 2003 revision 004
  • Latest Daily Certified version March 23, 2017 revision 041
  • Initial Weekly Certified release date September 17, 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When Adware.NetOptimizer is executed, it performs the following actions:
  1. Creates some of the following files:

    • %ProgramFiles%\Internet Optimizer\actalert.exe
    • %ProgramFiles%\Internet Optimizer\optimize.exe
    • %ProgramFiles%\Internet Optimizer\update\actalert.exe
    • C:\Internet Optimizer\optimize.exe
    • %UserProfile%\Internet Optimizer\optimize.exe
    • %Windir%\nem[XXX].dll
    • %Windir%\optimize.exe
    • %Windir%\wsem[XXX].dll
    • C:\Documents and Settings\Administrator\Local Settings\Temp\cfin
    • C:\Documents and Settings\Administrator\Local Settings\Temp\cfout.txt

      Notes:
    • [XXX] is a 3-digit number referring to the version of the software.
    • %ProgramFiles% is a variable that refers to the program files folder. By default, this is C:\Program Files.
    • %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows (Windows 95/98/Me/XP)or C:\Winnt (Windows NT/2000.
    • %UserProfile% is a variable that refers to the current user's profile folder. By default, this is C:\Documents and Settings\[CURRENT USER] (Windows NT/2000/XP).

  2. Adds the value:

    "Internet Optimizer" = "%ProgramFiles%\Internet Optimizer\optimize.exe"

    to the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    so that the risk runs every time Windows starts.

  3. May create an entry referencing the value DyFuca, under the following registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  4. Creates the following registry subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00000010-6F7D-442C-93E3-4A4827C2E4C8}
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{8F4E5661-F99E-4B3E-8D85-0EA71C0748E4}
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CEA206E8-8057-4A04-ACE9-FF0D69A92297}
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{1C01D150-91A4-4DE0-9BF8-A35D1BDF1001}
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{AA4939C3-DECA-4A48-A454-97CD587C0EF5}
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{EEE4A2E5-9F56-432F-A6ED-F6F625B551E0}
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{0BE10B0D-B4DB-4693-9B1F-9AEAD54D17DC}
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{40B1D454-9CA4-43CC-86AA-CB175EAC52FB}
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\DyFuCA_BH.BHObj
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\DyFuCA_BH.BHObj.1
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\DyFuCA_BH.SinkObj
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\DyFuCA_BH.SinkObj.1
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\DyFuCA
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Internet Optimizer
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Internet Optimizer Active Alert
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WSEM Update
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Kapabout
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{00000010-6F7D-442C-93E3-4A4827C2E4C8}
    HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Avenue Media
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\AMeOpt
    HKEY_LOCAL_MACHINE\SOFTWARE\Avenue Media
    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\AMeOpt
    HKEY_CURRENT_USER\Software\Policies\Avenue Media
    HKEY_CURRENT_USER\Software\Avenue Media

  5. May also create the following registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\FCI

  6. Deletes the value:

    "{CFBFAE00-17A6-11D0-99CB-00C04FD64497}" = ""

    from the registry subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\URLSearchHooks

  7. Adds the value:

    "_{CFBFAE00-17A6-11D0-99CB-00C04FD64497}" = ""

    to the registry subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\URLSearchHooks

  8. Periodically displays advertisements.

  9. Dynamically updates itself.

  10. The program's End User License Agreement (EULA) states that the software may collate data relating to Web browsing habits and send it back to its controllers.



Removal using the Adware.NetOptimizer Removal Tool
Symantec Security Response has developed a removal tool for Adware.NetOptimizer. Use this removal tool first, as it is the easiest way to remove this threat.

The tool can be found here:
http://securityresponse.symantec.com/avcenter/FxNetOpt.exe

The current version of the tool is 1.0.0 and will have a digital signature timestamp equivalent to 12/30/2004 8:38 AM.

Note:
The date and time displayed will be adjusted to your time zone, if your computer is not set to the Pacific time zone.

It has been reported that a computer with Adware.NetOptimizer on it may also have other security risks installed. Symantec recommends that the following steps be carried out:
  1. Apply the Adware.NetOptimizer Removal Tool.
  2. Update the definitions by starting the Symantec program and running LiveUpdate.
  3. Run a full system scan to detect any other security risks on the computer.
  4. If the scan detects any further security risks, check for removal tools at http://securityresponse.symantec.com/avcenter/security.risks.tools.list.html.
  5. If there are no removal tools for the security risks that are detected, follow the manual removal instructions listed in the threat report.


Manual Removal
The following instructions pertain to all Symantec antivirus products that support security risk detection.
  1. Update the definitions.
  2. Uninstall the security risk.
  3. Run a full system scan.
  4. Delete any 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 uninstall the Security Risk
  1. Do one of the following:
    1. On the Windows 98 taskbar:
      1. Click Start > Settings > Control Panel.
      2. In the Control Panel window, double-click Add/Remove Programs.

    2. On the Windows Me taskbar:
      1. Click Start > Settings > Control Panel.
      2. In the Control Panel window, double-click Add/Remove Programs.
        If you do not see the Add/Remove Programs icon, click "...view all Control Panel options."

    3. On the Windows 2000 taskbar:
      By default, Windows 2000 is set up the same as Windows 98, so follow the instructions for Windows 98. If otherwise, click Start, point to Settings > Control Panel, and then click Add/Remove Programs.

    4. On the Windows XP taskbar:
      1. Click Start > Control Panel.
      2. In the Control Panel window, double-click Add or Remove Programs.

  2. Click Internet Optimizer.


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

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

  4. Do one of the following:
    1. On the Windows 98 taskbar:
      1. Click Start > Settings > Control Panel.
      2. In the Control Panel window, double-click Add/Remove Programs.

    2. On the Windows Me taskbar:
      1. Click Start > Settings > Control Panel.
      2. In the Control Panel window, double-click Add/Remove Programs.
        If you do not see the Add/Remove Programs icon, click "...view all Control Panel options."

    3. On the Windows 2000 taskbar:
      By default, Windows 2000 is set up the same as Windows 98, so follow the instructions for Windows 98. If otherwise, click Start, point to Settings > Control Panel, and then click Add/Remove Programs.

    4. On the Windows XP taskbar:
      1. Click Start > Control Panel.
      2. In the Control Panel window, double-click Add or Remove Programs.

  5. Click Active Alert.


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

  6. 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.

3. To run the scan
  1. Start your Symantec antivirus program, and then run a full system scan.
  2. 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.

        If Windows reports that it cannot delete the file, this indicates that the file is in use. In this situation, complete the rest of the instructions on this page, restart the computer in Safe mode, and then delete the file using Windows Explorer. Restart the computer in Normal mode.

    • 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.

        If Windows reports that it cannot delete the file, this indicates that the file is in use. In this situation, complete the rest of the instructions on this page, restart the computer in Safe mode, and then delete the file using Windows Explorer. Restart the computer in Normal mode.

  3. Click Start > Programs > Accessories > Windows Explorer.
  4. Navigate to and delete any of the following folders of they exist:

    • %ProgramFiles%\Internet Optimizer
    • C:\Internet Optimizer
    • %UserProfile%\Internet Optimizer
    • C:\Documents and Settings\Administrator\Local Settings\Temp\cfin
    • C:\Documents and Settings\Administrator\Local Settings\Temp\cfout.txt

  5. Exit Windows Explorer.
Important: If you are unable to start your Symantec antivirus product or the product reports that it cannot delete a detected file, you may need to stop the risk from running in order to remove it. To do 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, restart the computer in Normal mode and proceed with the next section.

Warning messages may be displayed when the computer is restarted, since the risk may not be fully removed at this point. You can ignore these messages and click OK. These messages will not appear when the computer is restarted after the removal instructions have been fully completed. The messages displayed may be similar to the following:

Title: [File path]
Message body: Windows cannot find [file name]. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.

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 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 subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  4. In the right pane, delete any value pertaining to "DyFuca" or "Internet Optimizer".

  5. Navigate to and delete the following registry subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{00000010-6F7D-442C-93E3-4A4827C2E4C8}
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{8F4E5661-F99E-4B3E-8D85-0EA71C0748E4}
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{CEA206E8-8057-4A04-ACE9-FF0D69A92297}
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{1C01D150-91A4-4DE0-9BF8-A35D1BDF1001}
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{AA4939C3-DECA-4A48-A454-97CD587C0EF5}
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{EEE4A2E5-9F56-432F-A6ED-F6F625B551E0}
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{0BE10B0D-B4DB-4693-9B1F-9AEAD54D17DC}
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{40B1D454-9CA4-43CC-86AA-CB175EAC52FB}
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\DyFuCA_BH.BHObj
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\DyFuCA_BH.BHObj.1
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\DyFuCA_BH.SinkObj
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\DyFuCA_BH.SinkObj.1
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\DyFuCA
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Internet Optimizer
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Internet Optimizer Active Alert
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WSEM Update
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Kapabout
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Browser Helper Objects\{00000010-6F7D-442C-93E3-4A4827C2E4C8}
    HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Avenue Media
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\AMeOpt
    HKEY_LOCAL_MACHINE\SOFTWARE\Avenue Media
    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\AMeOpt
    HKEY_CURRENT_USER\Software\Policies\Avenue Media
    HKEY_CURRENT_USER\Software\Avenue Media
    HKEY_LOCAL_MACHINE\SOFTWARE\FCI

  6. Navigate to the subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\URLSearchHook

  7. In the right pane, reset the value if it exists:

    _{CFBFAE00-17A6-11D0-99CB-00C04FD64497}


    to the value:

    {CFBFAE00-17A6-11D0-99CB-00C04FD64497}

  8. Exit the Registry Editor.