Verify you’re running the correct file
def find_pyinstaller_cookie(data): # Look for cookie signature near end of file # PyInstaller cookie format: 8 bytes magic (MEI\0\0\0\0 or similar) # plus version and struct length cookie_magic = b'MEI\0\0\0\0' # older versions alternatives = [b'MEI', b'PYZ', b'\x33\x0F'] # heuristics for offset in range(len(data) - 100, max(0, len(data) - 5000), -4): if data[offset:offset+4] in alternatives: return offset return None len(data) - 5000)
: For newer or heavily modified archives, community members sometimes provide updated scripts like pyinstxtractor-ng that handle custom magic and AES keys generated at runtime. len(data) - 5000)