miscPromedium

shell(de)coding

hxp_39c3

Task: Write x86-64 shellcode under 42 bytes to decode Base64. Solution: Probabilistic approach ignoring +/- characters (~25% success rate), compact assembly with register reuse and stosd trick for 3-byte writes.

$ ls tags/ techniques/
base64x86-64shellcodeoptimization
probabilistic_decodingregister_reusecompact_arithmetic
๐Ÿ”’

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