Tools used: exeinfo,Reflector
Codes & Binaries: https://github.com/jmprsp/labyrenth/tree/master/Window-Challenge-5
Description: This challenge is written in C#. One would need to figure the correct RGB value to get the flag. Just decompile and analyze the code to get the RGB value.
Based on the figure below, we know that this is a C# program.
Using decompiler like reflector, we can easily get the decompiled source code. I have placed the source code in github for you to play with.
Analyzing the source codes, we will come across the above function in frmMain.cs. Looks like we need some bruteforcing to get the correct RGB key.
Running the above script, we would be able to get the correct RGB to solve the challenge.