Закодированный мопс (Encoded Pug)

hackerlab

Task: Decode a 111MB file with multi-layer encoding to find a hidden flag. Solution: Sequential decoding (Base64 → Binary → Octal → ZIP → HEX → PNG), then extract hidden PNG after IEND chunk and XOR both images to reveal LSB-hidden flag.

zip base64 exiftool lsb png hidden_data multi_layer_encoding binary octal hex image_steganography xor iend_chunk

Multi-layer encoding chain (Base64 → Binary → ASCII → Octal → ZIP → HEX → PNG)PNG file structure analysis (IEND chunk trailer detection)Image steganography via LSB XOR differenceVisual steganography (flag visible in image difference)

$ ls tags/ techniques/

zip base64 exiftool lsb png hidden_data multi_layer_encoding binary octal hex image_steganography xor iend_chunk

Analysis

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

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