Threat Explorer

The Threat Explorer is a comprehensive resource consumers can turn to for daily, accurate, up-to-date information on the latest threats, risks and vulnerabilities.



February 13, 2007
Professional Global Marketing
Risk Impact:
File Names:
SKS.exe (installer),Stealth Keyspy.exe,SKSLib.dll
Systems Affected:


Spyware.StealthKeySpy monitors and logs a user's keystrokes, visited Web sites, and opened windows.


One or more files are detected as Spyware.StealthKeySpy.


Must be manually installed.

Antivirus Protection Dates

  • Initial Rapid Release version October 02, 2014 revision 022
  • Latest Rapid Release version February 01, 2015 revision 020
  • Initial Daily Certified version December 04, 2004
  • Latest Daily Certified version January 17, 2008 revision 033
  • Initial Weekly Certified release date December 04, 2004
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When Spyware.StealthKeySpy is executed, it performs the following actions:

  1. Creates the following files:
    • %System%\SKS\Stealth KeySpy.exe
    • %System%\SKS\SKSLib.dll

      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:

    "Sysconfig"="%System%\SKS\Stealth KeySpy.exe"

    to the registry key:


    so that Spyware.StealthKeySpy runs every time Windows starts.

  3. Adds the registry keys:

    HKEY_LOCAL_MACHINE\Software\Microsoft\IE 5

  4. Runs stealthily and records all keystrokes, visited Web sites, and executed programs.

  5. The log file is, by default, encrypted with sks20 as the encryption key.

  6. The log files can also be sent to an email address.

Note : The uninstaller for this product does not reliably remove all the components.

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 Spyware.StealthKeySpy 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

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:


  4. In the right pane, delete the value:

    "Sysconfig"="%SYSTEM%\SKS\Stealth KeySpy.exe"

  5. Navigate to and delete the keys and all their subkeys:

    HKEY_LOCAL_MACHINE\Software\Microsoft\IE 5

  6. Exit the Registry Editor.