The request-cache-py package on PyPI is a malicious library impersonating the legitimate requests-cache library. Upon import, it starts a background thread that harvests sensitive installer-side secrets including SSH private keys, AWS credentials, Git credentials, npm and Docker config files, and browser data such as saved logins, cookies, and history. It also collects environment variables containing sensitive keywords and exfiltrates all this data to a hardcoded Telegram bot. The package includes sandbox evasion techniques to avoid detection in CI environments and prevents repeated data exfiltration within 24 hours. This is a deliberate supply-chain credential stealer targeting developer workstations.