chmod +x crackfire file crackfire # crackfire: ELF 64-bit LSB executable, x86‑64, dynamically linked, ... The binary is – symbols are present, making static analysis easier. 2. Quick run‑through Running the binary locally shows the intended user interaction:
%p %p %p %p %p %p %p %p %p %p %p %p %p %p %p %p Output (truncated): https- bit.ly crackfire
Access granted! Flag: FLAG... The goal is to get the flag brute‑forcing the secret. 3. Static analysis 3.1. strings & nm strings crackfire | head # … many strings, including "Access granted!", "Invalid code!" nm -D crackfire | grep -i win # 0000000000401240 T win The function win prints the flag. The usual pattern in these CTF binaries is: chmod +x crackfire file crackfire # crackfire: ELF
# ---------------------- CONFIGURATION ------------------------ binary = "./crackfire" elf = ELF(binary) context.binary = binary context.log_level = "info" Quick run‑through Running the binary locally shows the