The 'joule-btp-extension' PyPI package versions 0.1.0, 0.1.1, 0.1.3, 0.1.4, and 0.1.6 contain malicious code that executes during installation. The setup.py script collects sensitive system files and environment variables, reads user files, and exfiltrates this data to a hardcoded attacker URL. It also creates a marker file in the virtual environment's bin directory for persistence and includes code to establish a reverse shell, enabling remote command execution. The package is identified as a proof-of-concept supply-chain attack targeting SAP Joule Desktop on macOS but was publicly uploaded, posing a risk to users who install it.