reversehard

War Hymn

tamuctf

Task: Multi-layer encrypted ELF with anti-debugging, embedded War Hymn lyrics as XOR key, zlib-compressed inner SO. Solution: Rolling checksum XOR decryption with lyrics key, zlib decompress, RC4 decrypt with 'AggiesAggiesAggies' key, identify real flag among decoy blocks.

$ ls tags/ techniques/

xor rc4 elf stripped_binary zlib anti_debugging memfd_create custom_elf_sections multi_layer_encryption embedded_payload dynamic_loading

zlib_decompressionrolling_checksum_xorrc4_decryptionin_memory_elf_loadingcustom_section_analysisdecoy_data_identification

Analysis

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

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