PCPJack’s Open SMTP Relay Toolkit Exposes 230 Cloud Servers
Researchers uncovered an unprotected HTTP directory hosting a 12‑file toolkit that reveals PCPJack’s control of 230 compromised AWS, GCP, and Azure servers used as a hidden SMTP relay network. The package includes multi‑architecture Chisel binaries, Python deployers, and state logs, confirming large‑scale email‑relay operations and earlier undocumented activity.