$ cat writeup.md…
$ cat writeup.md…
spbctf
Task: a ~9.7 MB PyInstaller-bundled Windows exe (Python 3.8) that validates a flag. Solution: extract with pyinstxtractor, decompile the entry pyc with decompyle3, and invert the check flag == res[::-1] by reversing the blob and base64-decoding it in 4-byte per-character chunks.
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$sign in$ grep --similar