This is the Athcon 2011 Capture The Flag solution paper.
You can download it from the following link: https://packetstormsecurity.com/files/download/102476/gngc_athcon_re_report_june2011.pdf
Source: https://packetstormsecurity.com/files/102476/AthCon-2011-Capture-The-Flag-Reversing-Solution.html