Threat Explorer

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Adware.Nafaoz

Adware.Nafaoz

Updated:
February 13, 2007
Risk Impact:
High
File Names:
Winlog0n.exe
Systems Affected:
Windows

Behavior


Adware.Nafaoz opens Internet browser windows and displays Web pages.

Symptoms


Files are detected as Adware.Nafaoz.

Behavior


This adware is likely to be manually installed.

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 January 13, 2005
  • Latest Daily Certified version March 23, 2017 revision 041
  • Initial Weekly Certified release date January 19, 2005
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When Adware.Nafaoz is executed, it performs the following actions:
  1. Creates the following files:

    • %System%\winlog0n.exe
    • %System%\drivers\audiox

      Note: %System% is a variable that refers to the System folder. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

  2. Adds the value:

    "Windows Update Manager" = "%System%\Winlog0n.exe"

    to the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    so that the adware runs every time Windows starts.

  3. Adds the value:

    " " = "{00020424-0000-0000-C000-000000000046}"

    to the registry keys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{03022430-ABC4-11D0-BDE2-00AA1A1953}\ProxyStubClsid
    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{03022430-ABC4-11D0-BDE2-00AA1A1953}\ProxyStubClsid32

  4. Adds the values:

    " " = "{1EA4DBF0-3C3B-11CF-810C-00AA00389B71}"
    "Version" = "1.1"

    to the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{03022430-ABC4-11D0-BDE2-00AA1A1953}\TypeLib

  5. Adds the value:

    " " = "oleacc.dll"

    to the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{1EA4DBF0-3C3B-11CF-810C-00AA00389B71}\1.1\0\win32

  6. Adds the value:

    " " = "4"

    to the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{1EA4DBF0-3C3B-11CF-810C-00AA00389B71}\1.1\FLAGS

  7. Adds the value:

    " " = "C:\winnt\system32"

    to the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{1EA4DBF0-3C3B-11CF-810C-00AA00389B71}\1.1\HELPDIR

  8. Injects itself into the explorer.exe and taskmgr.exe processes. This is done in order to immediately restart the winlog0n.exe process, if it is killed.

  9. Monitors window titles and text contents for certain Chinese phrases. If certain strings are detected, then a Web page is opened in a new browser window.



The following instructions pertain to all Symantec antivirus products that support Security Risk detection.
      1. Update the definitions.
      2. Restart the computer in Safe mode.
      3. Run a full system scan.
      4. Delete the value that was 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 restart the computer in Safe mode
      Shut down the computer and turn off the power. Wait for at least 30 seconds, and then restart the computer in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode."


      3. To run the scan
      1. Start your Symantec antivirus program, and then run a full system scan.
      2. If any files are detected as Adware.Nafaoz 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 threat 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 threat 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 threat for this scan only, and thus, the threat 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.

        • 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 threat 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.

      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.
      1. Click Start > Run.
      2. Type regedit

        Then click OK.

      3. Navigate to the key:

        HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

      4. In the right pane, delete the value:

        "Windows Update Manager"="%system%\Winlog0n.exe"

      5. Delete the following keys:

        HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{03022430-ABC4-11D0-BDE2-00AA1A1953}
        HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{1EA4DBF0-3C3B-11CF-810C-00AA00389B71}

      6. Exit the registry editor.