$ cat writeup.md…
$ cat writeup.md…
ringzer0ctf
Task: a fake Windows keylogger validates each keystroke through a 17-case jump-table state machine and CRC-checks the buffer. Solution: Unicorn-emulated the handler cases, found the movsx sign-extension trap, inverted all checks, brute-forced the residual positions against the hardcoded CRC32 target.
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