Spyware.NTLogonCapture

SUMMARY

Behavior

Spyware.NTLogonCapture captures operating system logon user names and passwords, and saves them to a file.

Symptoms

The files are detected as Spyware.NTLogonCapture.

Transmission

This spyware must be manually installed.

Protection

• Virus Definitions (LiveUpdate™ Weekly) June 9, 2004
• Virus Definitions (Intelligent Updater) June 9, 2004

TECHNICAL DETAILS

Spyware.NTLogonCapture installs a Graphical Identification and Authentication (GINA) DLL. This file intercepts user logons to the operating system.


By default, the GINA DLL file is Ssntlc.dll and the log file is Ntlogoncapture.txt, but these are configurable when the software is installed.

REMOVAL

The following instructions pertain to all Symantec antivirus products that support Security Risk detection.

1. Update the definitions.
2. Delete the value that was added to the registry and delete a file.
3. Run a full system scan and delete all the files detected as Spyware.NTLogonCapture.
   

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 delete the value from the registry

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WARNING: 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.

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1. Click Start, and then click Run. (The Run dialog box appears.)
2. Type regedit
   
   Then click OK. (The Registry Editor opens.)
   
   
3. Navigate to the key:
   
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionApp Paths tlc.exe
   
   
4. In the right pane, write down the Value data of the Values:
   
   logfile
   
   and:
   
   olddll
   
   
5. Navigate to the key:
   
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionApp Paths
   
   
6. In the right pane, delete the key:
   
   ntlc.exe
   
   
7. Navigate to the key:
   
   HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionWinlogon
   
   
8. In the right pane, set the Value data of:
   
   GinaDLL
   
   to the Value data noted for olddll in step d.
   
   If olddll was empty, then delete GinaDL.
   
   
9. Exit the Registry Editor.
   
10. Using Windows Explorer, delete the file whose path was shown in the logfile Value data box (in step d).
    
11. Restart the computer.

3. To scan for and delete the files

1. Start your Symantec antivirus program, and then run a full system scan.
2. If any files are detected as Spyware.NTLogonCapture, click Delete.
   
   

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   Note: If your Symantec antivirus product reports that it cannot delete a detected file, write down the path and file name. Then use Windows Explorer to locate and delete the file.

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