input

Just see the attachment.

output

When you execute the program, you have to wait 42h. We don’t have time for that:

So let’s have a look inside the exe file:

~/Téléchargements$ strings scream.exe | grep -i net | more
s9Net<
NETSCAPE2.0
NET/
unET
NETy
nnet
"NEt
SneT
Netl
.NETFramework,Version=v4.0
.NET Framework 4

Ok it’s a .NET file, it’s easier to use .NET reflector for this:

A bitmap? Don’t worry, foremost is your friend:

root@kali:/media/sf_challenge/CTF/JuniorsCTF/JuniorsCTF2017/We'vediscoveredanotherplanet!# foremost scream.exe 
Processing: scream.exe
|*|
root@kali:/media/sf_challenge/CTF/JuniorsCTF/JuniorsCTF2017/We'vediscoveredanotherplanet!# ls output/png/
00000005.png

That’s all: