AlpacaForm

"This challenge can be solved on Linux alone."

Beginner Hint 1: Challenge Overview (AI-translated)

• The distributed files are a .NET application written in C# and a flag checker that determines whether the entered string is the correct flag.
• AlpacaForm.exe is the executable file used to launch the app on Windows. The C# code containing the actual validation logic is in AlpacaForm.dll.
• .dll stands for Dynamic Link Library. In general, it is a file that contains code or data loaded and used by executable files or other programs.

Beginner Hint 2: Reverse Engineering (AI-translated)

• AlpacaForm.dll can be decompiled and read in a form close to C# using a .NET decompiler such as ILSpy.
• For example, try running ilspycmd AlpacaForm.dll to decompile it (Ref).
• After decompiling it, look for the function that validates the entered string.