QuickScan [HackTheBox Cyber Apocalypse CTF 2024]

Published: 07 March 2025
on channel: 0xdf

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QuickScan is a challenge from the 2024 HackTheBox Syber Apocalypse CTF. I'm given ELF binaries as a base64 encoded string. Each one loads 24 bytes onto the stack and exits. I need to get that value and return it 129 times in less than 2 minutes to get the flag. I'll do some basic reverse engineering in gdb and Ghidra, and then use Python and PwnTools to interact with the server, get the bianry, decode it, locate the buffer, read it, and send it back.

Final Script: https://gitlab.com/0xdf/ctfscripts/-/...

☕ Buy Me A Coffee: https://www.buymeacoffee.com/0xdf

[00:00] Introduction
[00:57] Challenge introduction
[01:32] Interacting with server
[02:05] Strategy
[02:44] Saving binaries
[03:24] Reversing warmup
[10:30] Reversing elf1
[11:13] Setting up Python program to get bytes
[12:30] Connecting and reading base64 string
[15:18] Saving ELF to file
[16:21] Calculating addresses
[20:17] Getting values as hex string
[21:00] Sending result to server
[21:18] Making function to loop over
[24:12] Solving challenge!
[24:31] Conclusion

#HackTheBox #ctf #reverse-engineering #python #pwntools

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