Command example with pyinstxtractor-ng :
python pyinstxtractor-ng.py your_file.exe Look for additional flags like --version or --force . UPX unpacks itself in memory, but the cookie may be compressed. either you’re using the wrong key
Remember: the cookie is there by design. If you can’t find it, either you’re using the wrong key, or someone intentionally hid it. In both cases, you now have the roadmap to work around the problem. either you’re using the wrong key