Olympic CTF 2014: Just No One

Category: Binathlon (Bin) Points: 10 Author: vos Description:

Here’s your binary: setup.exe

Write-up

The provided setup.exe file is a standard installation wizard.

As usual with these wizards, the second screen contains a very long license agreement that must be accepted before continuing the installation.

The next screen prompts for a password. Which password? Hmm… It’s possible to crack it and then proceed with the installation, but that doesn’t really help, because when the executable is opened, it just repeats “You already saw the flag.”:

And indeed — after running setup.exe again and carefully reading the license agreement this time, we notice something unusual:

The flag is ILOVEREADINGEULAS.

Other write-ups and resources

• http://maroueneboubakri.blogspot.com/2014/02/olympic-ctf-sochi-2014-binathlon-10.html
• https://ctftime.org/writeup/926
• http://cybersecurity.cci.fsu.edu/olympic-ctf-2014-writeup/
• http://delimitry.blogspot.ru/2014/02/olympic-ctf-2014-writeups.html
• http://ctfwriteups.blogspot.jp/2014/02/olympic-ctf-2014-binathlon-10-just-no.html
• Chinese