Exterminate It! Antimalware


Known threats:699,742 Last Update:November 20, 22:46


It seems that the problem with UACd.sys virus has been solved by this program. So many thanks for creating this amazingly useful program.

Eva S.

File: NsPass4.sys

Location of NsPass4.sys and Associated Malware

Check whether NsPass4.sys is present in the following locations:

NsPass4.sys file locations that are Windows version independent:

  • C:\Windows\System32\nsPass4.sys

If you find NsPass4.sys file in any of these locations, your computer is very likely to be infected with the following malware:

IMPORTANT: Malware files can be camouflaged with the same file names as legitimate files. The NsPass4.sys file is associated with malware only if found in the locations listed above.


Different Variations of NsPass4.sys File^

File SizeFile Md5Last Seen
8832CEDA082BD55A069C7446B024CCE8403AJun 10, 2010
8320E86B509B01E4A2F1BAC1CE3A035A01B1Dec 4, 2010
83202524DC54E44B2943CECC74BB65881E4EMay 1, 2011
83207AB13529D1C5BB3360A4E4B3C3CA9BF6Nov 24, 2011
83202CD8777CDFBC52C4B7B8CD47C7F4B788Jun 4, 2011
83209A6A3939D9C299D29BD9FE9AB90A7046Apr 29, 2013

Why Is It Important to Remove Malware Files?^

It is imperative that you delete malware-associated files as soon as possible because they can be used - or are already being used - to inflict serious damage on your PC, including:

  • Disrupting the normal functioning of the operating system or rendering it completely useless.
  • Hijacking valuable private information (credit card numbers, passwords, PIN codes, etc.)
  • Directing all your Web searches to the same unwanted or malicious sites.
  • Dramatically slowing down your computer.
  • Gaining total control of your PC to spread viruses and trojans and send out spam.

How to Remove NsPass4.sys^

  1. To enable deleting the NsPass4.sys file, terminate the associated process in the Task Manager as follows:
    • Right-click in the Windows taskbar (a bar that appears along the bottom of the Windows screen) and select Task Manager on the menu.
    • In the Tasks Manager window, click the Processes tab.
    • On the Processes tab, select NsPass4.sys and click End Process.
  2. Using your file explorer, browse to the file using the paths listed in Location of NsPass4.sys and Associated Malware.
  3. Select the file and press SHIFT+Delete on the keyboard.
  4. Click Yes in the confirm deletion dialog box.
  5. Repeat steps 2-4 for each location listed in Location of NsPass4.sys and Associated Malware.
  6. Notes:

    • The deletion of NsPass4.sys will fail if it is locked; that is, it is in use by some application (Windows will display a corresponding message). For instructions on deleting locked files, see Deleting Locked Files.
    • The deletion of NsPass4.sys will fail if your Windows uses the NT File System (NTFS) and you have no write rights for the file. Request your system administrator to grant you write rights for the file.

Deleting Locked Files^

You can delete locked files with the RemoveOnReboot utility. You can install the RemoveOnReboot utility from here.

After you delete a locked file, you need to delete all the references to the file in Windows registry.

To delete a locked file:

  1. Right-click on the file and select Send To -> Remove on Next Reboot on the menu.
  2. Restart your computer.

The file will be deleted on restart.

Note: In the case of complex viruses that can replicate themselves, malware files can reappear in the same locations even after you have deleted those files and restarted your computer. Exterminate It! Antimalware can effectively eradicate such viruses from your computer.

To remove all registry references to a NsPass4.sys malware file:

  1. On the Windows Start menu, click Run.
  2. In the Open box, type regedit and click OK. The Registry Editor window opens.
  3. On the Edit menu, select Find.
  4. In the Find dialog box, type NsPass4.sys. The name of the first found registry value referencing NsPass4.sys is highlighted in the right pane of the Registry Editor window.
  5. Right-click the registry value name and select Delete on the menu.
  6. Click Yes in the Confirm Value Delete dialog box.
  7. To delete all other references to NsPass4.sys, repeat steps 4-6.
IMPORTANT: Malware files can masquerade as legitimate files by using the same file names. To avoid deleting a harmless file, ensure that the Value column for the registry value displays exactly one of the paths listed in Location of NsPass4.sys and Associated Malware.