The second blog for CTT2023.
For this one, we will get an Reverse CTF.exe file:
I don’t know much about Reverse engineering an exe file but when I see Mono or .Net , I thought of dnSpy (https://github.com/dnSpy/dnSpy)
So, I start up iLSpy ( dnSpy for macOS) and import the file:
Under class Form1 , we see the Encrypt and Decrypt:
And under button1_Click , there is a call to both function:
So, I startup CyberChef and put everything in there:
and just like that, we got the flag!
Part1: