Don't Be Afraid of the Dark

hackerlab

Task: PNG image that appears completely black. Solution: Analyzed alpha channel variations (254 vs 255) and created binary mask to reveal hidden flag text.

steganography image_analysis png alpha_channel rgba transparency pixel_analysis hidden_in_dark

Alpha channel value analysisBinary mask generation from alpha differencesInvisible data in transparency layer

$ ls tags/ techniques/

steganography image_analysis png alpha_channel rgba transparency pixel_analysis hidden_in_dark

Alpha channel value analysisBinary mask generation from alpha differencesInvisible data in transparency layer

Analysis

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

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

Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

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