reverseProhard

Skretch

tamuctf

Task: 372MB Scratch 3 project with 1.7M blocks verifying PNG through 38,566 linear equations. Solution: Parse obfuscated Scratch blocks, substitute runtime variable goodbye=0, solve consecutive-index equations sequentially starting from PNG header bytes.

$ ls tags/ techniques/

division_by_zero base64 png obfuscation linear_equations scratch sb3

scratch_block_parsingexpression_tree_evaluationsequential_equation_solvingruntime_variable_substitution

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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