A section header points to different sections in an ELF file. This format consists of the ELF header, followed by a program header or section header, or both. Without going into too much detail, executable and linkable format (ELF) is a standard file format for executables, object files, and others. We see it was statically linked and there is no section header. See something rather strange about this binary. Output of file command on ZED-Crackme-圆4.bin
We are going to run file to see what type of binary we are dealing with. We start out with some initial analysis of the binary we received.
With all of that out of the way, let's get reversing! Initial Triage The binary comes in a password protected zip file. If you don't want to use my VM that's fine, my feelings won't be shattered. You can find instructions on importing the VM here. If you want to follow along feel free to download the VM I provide. As always I hope you have a good time reading! I also have a YouTube channel and you are free to check out the corresponding video for this challenge here: Zed's Crackme YouTube video Optional Materials to Follow Along The more disassembly we read the better right? However, I will clearly mark where the rabbit hole is so you can skip that section if you feel so obliged. I will take you down this rabbit hole as I think it is a good exercise to improve our reversing chops. In the description the author mentions our goal is to find the serial and he set 2 restrictions on us: "we cannot patch" and "we cannot bruteforce." These are not terrible restrictions, we haven't patched a binary yet and bruteforcing is beneath us right 🙂? Fair warning, the author is tricky and he left in an annoying rabbit hole which I fell for when I initially solved this challenge. I really enjoyed solving this challenge and making the video/this blog post. Hello and welcome back! I'm excited because this challenge was written by a good friend of mine! It's called "Zed's Crackme" and it is hosted on the website crackmes.one.
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