$ cat writeup.md…
$ cat writeup.md…
ringzer0ctf
Task: a 121-byte headerless file is raw position-independent x86-64 shellcode that must be reversed to recover a hidden string. Solution: statically disassemble with ndisasm/capstone, skip the opaque-predicate and int3 decoys, and inverse the neg byte-transform loop in the inline buffer before the write syscall.
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