This is a beginners Reversing Challenge. It is build with the optimization level set to 0 so that the assembler is more readable. If you are new to reversing, please remember that to solve Reversing challenges you probably need to know some C/C++, Assembler and also some experience with gdb (the gnu debugger). And maybe Ghidra. So this challenge is a great place to start Reversing, but unfortunately it's only 10 points because it's easier than other reversing challenges. It probably requires more skills than solving a 10 point Forensics problem like RubberDuck. If you solve the challenge you can use the flag to decrypt the sources and see how the challenge is created.
Discussion
Glad you liked it - you're welcome :-)
I have to admit...I dont get it. Even though people say its easy. I analysed it via objdump, stepped through it with gdb and got it to print the "whoop whoop" message (with my input of course). So any hints?
Can you send me a DM on discord?
Sure! Havent used it so far and maybe I can find others to do CTFs together. But I probably wont be able to make it this week.
Try binary ninja, it works pretty well: https://binary.ninja/
Okay, thanks man! Wanted to get started with Ghidra anyway. But doesnt seem Ghidra a bit overkill for a 10p challenge?
Glad you liked it - you're welcome :-)
I have to admit...I dont get it. Even though people say its easy. I analysed it via objdump, stepped through it with gdb and got it to print the "whoop whoop" message (with my input of course). So any hints?
Can you send me a DM on discord?
Sure! Havent used it so far and maybe I can find others to do CTFs together. But I probably wont be able to make it this week.
Try binary ninja, it works pretty well: https://binary.ninja/
Okay, thanks man! Wanted to get started with Ghidra anyway. But doesnt seem Ghidra a bit overkill for a 10p challenge?
7 months ago
That's pretty cool, I learned a lot. Thanks author =]