reverseProhard

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hackerlab

Task: a broken PE32+ encrypter and a large encrypted file hide the real flag behind packing, decoy strings, and a timestamp-seeded transform. Solution: patch the PE header, unpack/analyze the routine, extract the hidden decimal ciphertext, emulate the code with Unicorn, and invert it byte by byte.

unicorn upx prng_seed windows_pe pe32_plus broken_mz unpacking timestamp_seed decimal_ciphertext

unicorn_emulationprng_seed_recoveryheader_patchingupx_stub_analysisbytewise_transform_inversion

$ ls tags/ techniques/

unicorn upx prng_seed windows_pe pe32_plus broken_mz unpacking timestamp_seed decimal_ciphertext

unicorn_emulationprng_seed_recoveryheader_patchingupx_stub_analysisbytewise_transform_inversion

Analysis

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

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