SecurityRisk.NavHelper

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Updated: February 13, 2007 11:35:08 AM
Type: Other
Publisher: NavExcel
Risk Impact: Medium
File Names: NHelper.dll
Systems Affected: Windows

Behavior


SecurityRisk.NavHelper displays advertisements based on keywords entered into search engines. This security risk works as a Browser Helper Object.

Note: Definitions prior to May 24, 2005 may detect this threat as Adware.NavHelper.

Symptoms


The files are detected as SecurityRisk.NavHelper.

Transmission


This security risk can be manually installed or installed as a component of another program.

Antivirus Protection Dates

  • Initial Rapid Release version October 02, 2014 revision 022
  • Latest Rapid Release version April 21, 2018 revision 037
  • Initial Daily Certified version October 20, 2003 revision 002
  • Latest Daily Certified version April 22, 2018 revision 007
  • Initial Weekly Certified release date October 22, 2003

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Updated: February 13, 2007 11:35:08 AM
Type: Other
Publisher: NavExcel
Risk Impact: Medium
File Names: NHelper.dll
Systems Affected: Windows


When SecurityRisk.NavHelper is executed, it performs the following actions:

  1. Creates the files:

    • %Program Files%\NavExcel
    • %Program Files%\NavExcel Search Toolbar

      Note: %ProgramFiles% is a variable that refers to the program files folder. By default, this is C:\Program Files.

  2. Creates the following registry subkeys:

    HKEY_CURRENT_USERS\Software\NavExcel Ltd
    HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\NavHelper

  3. Creates the following folder, which contains files relating to the security risk:

    %Program Files%\NavExcel\NavHelper

  4. Allows a user to type keywords instead of URLs when trying to access Web sites.

  5. Contacts various search sites for the keyword search redirection.

  6. Runs as a Browser Helper Object, which means the risk receives information regarding all the actions inside Internet Explorer.

  7. Checks the IP address of the computer it is installed on. The search results may be determined by the geographical location of the IP address.


Updated: February 13, 2007 11:35:08 AM
Type: Other
Publisher: NavExcel
Risk Impact: Medium
File Names: NHelper.dll
Systems Affected: Windows


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 NavHelper.


    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.

    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.
Important: If your Symantec antivirus product reports that it cannot delete a detected 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, 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 and delete the subkeys:

      HKEY_CURRENT_USERS\Software\NavExcel Ltd
      HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel
      HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\NavHelper

    4. Exit the Registry Editor.