#StopRansomware: Gunra Ransomware Exploits Exposed RDP and VPN Gateways

CISA, the FBI, NSA, DC3, and South Korea's National Police Agency have jointly issued advisory AA26-222A warning about Gunra, a ransomware-as-a-service operation that has expanded rapidly since launching a formal affiliate program on dark web forums in early 2026. Gunra actors use a double-extortion model — encrypting victim data while threatening to publish it on a Tor-based dedicated leak site if the ransom isn't paid — and have hit healthcare, financial services, critical manufacturing, transportation, and government targets across the Americas, Europe, the Middle East, Africa, and Asia-Pacific. The advisory's top mitigation is blunt: prioritize patching known exploited vulnerabilities in internet-facing systems, specifically calling out VPN gateways and RDP-exposed infrastructure as the entry points actors are actively using to get in.

This is exactly the failure mode PurpleTrain's Port Security module is built around. The module teaches learners why an open or misconfigured network port — an RDP service left reachable from the internet, a VPN gateway running unpatched software — isn't a minor oversight but a standing invitation for exactly this kind of attack. Gunra's affiliates don't need a clever social-engineering angle when a port is just sitting open; understanding why internet-facing services need to be inventoried, patched, and access-restricted is the difference between an organization that never shows up on a ransomware leak site and one that does.