PCPJack Hijacks 230 AWS, Google Cloud, and Azure Servers for Covert SMTP Relay Network

Hunt.io discovered that PCPJack compromised cloud servers across AWS, Google Cloud, and Azure and converted them into a 230-node covert SMTP relay/proxy network; exposed files on a C2 server revealed Sliver- and Chisel-based tooling, deployer and verifier scripts, persistence artifacts, and a pipeline that tests and syncs verified proxies every five minutes to a downstream consumer, indicating active exploitation and large-scale email-delivery capability for spam, phishing, or other abuse.