ILSpy is an open-source.NET assembly browser and decompiler. We demonstrate its use looking at a simple adware file. The code in the code is shown in a very clear format. Even knowing how to read pseudocode and where to find the code will get you a long way, as Im about to demonstrate. The program will not be shown in the taskbar or show any error prompts in case any script errors occur. If the title of the site does not match searchbox then it simply redirects the user to the URL that is obfuscated.”]
Source: https://blog.malwarebytes.com/threat-analysis/2017/10/using-ilspy-to-analyze-a-small-adware-file/