What is nssstub.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the nssstub.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Nssstub.exe file information

Windows Task Manager with nssstub
Nssstub.exe process in Windows Task Manager

The process known as nssstub belongs to software nssstub Components or Adobe Shockwave Player by Symantec (

Description: Nssstub.exe is not essential for the Windows OS and causes relatively few problems. The file nssstub.exe is located in a subfolder of C:\Windows\System32 or sometimes in a subfolder of C:\Windows. Known file sizes on Windows 10/8/7/XP are 181,624 bytes (66% of all occurrences), 497,016 bytes or 284,024 bytes. 
The file is a Verisign signed file. The nssstub.exe file is digitally signed. The application is loaded during the Windows boot process (see Registry key: MACHINE\RunOnce). The nssstub.exe file is not a Windows system file. The program has a visible window. Nssstub.exe is able to monitor applications. Therefore the technical security rating is 7% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you encounter difficulties with nssstub.exe, you can uninstall the program using the Control Panel ⇒ Uninstall a ProgramAdobe Shockwave Player.

Recommended: Identify nssstub.exe related errors

Important: Some malware camouflages itself as nssstub.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the nssstub.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

NSSstub.exe is Norton Security Scan executable.

Summary: Average user rating of nssstub.exe: based on 2 votes with 1 user comment. One user thinks nssstub.exe is essential for Windows or an installed application. One user thinks it's probably harmless.

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Best practices for resolving nssstub issues

A clean and tidy computer is the key requirement for avoiding problems with nssstub. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the nssstub.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

nssstub.exe [all]