#StopRansomware: Gunra Ransomware

On August 05, 2026, the CISA Cybersecurity Advisory AA26-222A detailed the tactics, techniques, and procedures associated with Gunra ransomware, a ransomware-as-a-service (RaaS) offering.

Gunra ransomware double-extortion model

The advisory describes Gunra as a ransomware variant that first appeared in 2025 and expanded into full RaaS operations in 2026. Affiliates using the service target government agencies, critical infrastructure entities, and other organizations. The ransomware employs a double-extortion approach: it encrypts victim data while simultaneously exfiltrating it and threatening to publish the stolen information on a dedicated leak site (DLS) unless a ransom is paid. The advisory provides technical details of the ransomware’s activity but does not state whether the flaw or specific tooling has been exploited in the wild beyond the campaign itself.

Target sectors

The advisory names three broad sectors at risk: government, critical infrastructure, and other organizations. It does not list specific affected products, software versions, or individual victim organizations.

What to do

• Review and implement the detection signatures and behavioral indicators listed in the CISA advisory.
• Apply all mitigations and hardening recommendations provided for Windows and network environments.
• Ensure robust backup procedures are in place that are isolated from network access.
• Monitor for indicators of compromise associated with Gunra ransomware activity.
• Subscribe to CISA alerts and regularly check the advisory for updates.

Organizations operating in government or critical infrastructure environments should treat this campaign as an active threat and prioritize the advisory’s technical guidance.