Deep#Door is an active malware campaign deploying a Python-based Remote Access Trojan on Windows systems to steal browser passwords, cloud authentication tokens, SSH private keys, and Wi-Fi credentials. The malware disables host security controls and routes command-and-control traffic through a public tunneling service, making it harder to detect with standard network monitoring. Organizations with Windows endpoints are at risk of credential compromise that could enable downstream access to cloud environments, internal systems, and sensitive data.