[0xricksanchez] participated in a software reverse-engineering challenge and recently wrote up the solution, and in so doing also documented the process used to discover it. The challenge was called Devil’s Swapper, and consisted of a small binary blob that output a short message when executed. The goal of the challenge? Discover the secret key and the secret message within. [0xricksanchez]’s writeup, originally intended just as a personal record, ended up doing an excellent job of showing how a lot of reverse engineering tools and processes get applied to software in a practical way.
What’s also great about [0xricksanchez]’s writeup is that it uses standard tools and plenty of screenshots to show what is being done, while also explaining why those actions are being chosen and what is being learned. It’s easy to follow the thought process as things progress from gathering information, to chasing leads, and finally leveraging what’s been learned. It’s a fascinating look into the process of applying the reverse engineering mindset to software, and a good demonstration of the tools. Give it a read, and see how far you can follow along before learning something new. Want more? Make sure you have checked out the Hackaday 2020 Remoticon videos on reverse engineering firmware, and doing the same for PCBs.