nis.exe is a program which is most likely NOT a virus. So, if nis.exe is on your PC, it is most likely ok, and will NOT be a cause for concern. Even if your system is virus-free, it is still recommended to run a well-known antivirus with a good track record, in order to yourself your PC against threats.
Usually, this program is found in C:\Program Files\Symantec.cloud\EndpointProtectionAgent\Engine\22.6.4.5\NIS.exe.
The MD5 checksum for this executable is bbabe157fcc26d28127f379ff5ca1dbd.
This application is a Windows service. This means it runs on your system in background, usually without showing anything to you. Most Windows services are ok programs, which perform useful functions to other programs or to Windows in general.
This executable uses the Internet to communicate. In this day and age this is quite normal. For example, most of the apps on your computer check for updates. In order to do this, Internet communications are required.
This app runs in 32-bit mode. It can not benefit of the entire power of current PC processors. This ordinarily happens because the makers did not upgrade it to use the x64 instruction set.
The description stored in the file is Symantec Service Framework.
File version stored as a property 13.1.0.74.
Maker Symantec Corporation.
Intellectual property rights notice Copyright (c) 2015 Symantec Corporation. All rights reserved..
This task does NOT have visible windows. This is usually a bad thing.
nis.exe is digitally signed. Today the large majority of virus-free programs are digitally signed.
The digital signature found in nis.exe verifies as ok. This is most likely a clean, ok program.
Digitally signed by: Symantec Corporation
Certificate's issuer name: VeriSign Class 3 Code Signing 2010 CA
It has an uninstall string in registry, which is good. si are uninstall.