Ngen.exe (Native Image Generator) is a legitimate file. It is also known as  Microsoft common language Runtime native Compiler and belongs to software microsoft .net framework. It is commonly stored in sub folder of C:\Windows. So the malware programmers or cyber criminals write malicious programs and name it as ngen.exe and spread infection via internet to damage the software and hardware.

 

 

 

When the internet connection is highly fluctuating or if it gets annoying popup ads or redirect to some strange websites or the system performance is very slow then the system might be affected by ngen.exe malware. To confirm that go to the task manager by pressing the combination of keys ctrl + alt +del and go to the process tab and right click on the ngen.exe and open the path if the file is located in C:\Windows then the system is not affected by ngen.exe. If the location is somewhere else then the system is affected by ngen.exe malware.