reversePromedium

Buggy Bunny

ringzer0ctf

Task: x86-64 crackme MD5-hashes the password, RC4-encrypts 'RingZer0Team CTF' under it and compares MD5(ciphertext) to a constant. Solution: model the buggy XOR-swap RC4 (self-swap zeroes S[i]) via a patched-binary oracle and Unicorn, then crack it from rockyou.txt with leet rules.

password_cracking rc4 md5 elf rockyou x86_64 crackme reverse unstripped_binary rules_engine

unicorn_emulationld_preload_hookpatched_binary_oraclexor_swap_bug_modelingwordlist_rules_attackleet_substitution

$ ls tags/ techniques/

password_cracking rc4 md5 elf rockyou x86_64 crackme reverse unstripped_binary rules_engine

unicorn_emulationld_preload_hookpatched_binary_oraclexor_swap_bug_modelingwordlist_rules_attackleet_substitution

Analysis

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$ python3 exploit.py --target 192.168.1.1 --port 8080
[*] Connecting to target...
[+] Shell obtained!

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