reversehard

Challenge7

tamuctf

Task: Stripped 64-bit ELF with VM-based obfuscation, anti-debugging (TracerPid, LD_PRELOAD, .text integrity), hash-chain dispatch, and self-modifying code. Solution: Deep static analysis of flag validation function revealed rolling hash with TEA-like constants; brute-forced each character position against hardcoded lookup tables.

$ ls tags/ techniques/

pie x86_64 hash_chain self_modifying_code stripped_binary vm_obfuscation anti_debugging rolling_hash

vm_dispatch_analysisanti_debug_bypassrolling_hash_bruteforcehash_chain_dispatchelf_section_integrity_check

Analysis

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

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