$ cat writeup.md…
$ cat writeup.md…
ringzer0ctf
Task: PE32+ Windows reverse (RingZer0 'Debug me if you can') with IsDebuggerPresent anti-debug gating a per-level crypto chain. Solution: ignore anti-debug under static analysis, recover 8-byte magic -> CryptoAPI MD5 -> DES key = MD5[:8] -> DES-ECB decrypt of embedded ciphertext to get the flag.
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