spaceraccoon.dev

reverseengineering

Late last year, I was invited to Facebook's Bountycon event, which is an invitation-only application security conference with a live-hacking segment. Although participants could submit vulnerabilities for any Facebook asset, Facebook invited us to focus on Facebook Gaming. Having previously tested Facebook's assets, I knew it was going to be a tough challenge. Their security controls have only gotten tougher over the years – even simple vulnerabilities such as cross-site scripting are hard to come by, which is why they pay out so much for those. As such, top white hat hackers tend to approach Facebook from a third-party software angle, such as Orange Tsai's well-known MobileIron MDM exploits.

Given my limited time (I also started late due to an administrative issue), I decided to stay away from full-scale vulnerability research and focussed on simple audits of Facebook Gaming's access controls. However, both the mobile and web applications were well-secured, as one would expect. After a bit of digging, I came across Facebook Gameroom, a Windows-native client for playing Facebook games. I embarked on an illuminating journey of applying offensive reverse engineering to a native desktop application.

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Introduction: Red Alert!

Last month, the Centre for Strategic Infocomm Technologies (CSIT) invited local cybersecurity enthusiasts to tackle the InfoSecurity Challenge (TISC). The Challenge was organized in a capture-the-flag format, with 6 cybersecurity and programming challenges of increasing difficulty unlocked one after another.

On New Year’s Eve, hackers from the PALINDROME group launched a ransomware attack on a major finance company and encrypted some of its critical data servers. Your mission is to complete a series of tasks to recover as much data as possible to prevent the company from having to give in to PALINDROME's demand. The tasks will increase in difficulty as you go along so be prepared to put up the fight of your life.

With this exciting introduction, I tackled a series of difficult problems that encompassed reverse engineering, binary exploitation, and cryptography. This took me far out of my comfort zone of application security, but since I wanted to build my skills in those areas, it was a welcome challenge.

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