#StopRansomware: Gunra Ransomware

Advisory at a Glance Title #StopRansomware: Gunra Ransomware Original Publication August 10, 2026 Executive Summary Gunra is a ransomware-as-a-service (RaaS) used by affiliates to target government, critical infrastructure, and other organizations. The Gunra ransomware variant first appeared in 2025 and expanded to RaaS operations in 2026. The actors leverage a double-extortion model, both encrypting data and threatening to publish exfiltrated data to a dedicated leak site (DLS) if the ransom is not paid. This advisory provides technical details of the activity, as well as tailored detection and mitigation guidance to protect at-risk organizations from Gunra. Key Actions Prioritize patching known exploited vulnerabilities in internet-facing systems , including virtual private network (VPN) gateways and remote desktop protocol (RDP)-exposed infrastructure. Implement and test offline, immutable backups stored in a physically separate, segmented location to ensure recoverability without ransom payment. Segment networks to restrict lateral movement from an initially compromised device to other systems in the organization. Indicators of Compromise For a downloadable copy of indicators of compromise, see: AA26-222A STIX XML (54 KB) AA26-222A STIX JSON (61 KB) Intended Audience Organizations: Government, Critical Infrastructure Sectors: Healthcare and public health , financial services and insurance, critical manufacturing and construction, transportation systems and logistics, government services and facilities , utilities, academia, media and communications, retail, and professional and nonprofit services. Roles: Cybersecurity architects , defensive cybersecurity analysts , vulnerability analysts , systems administrators , and security systems managers . Introduction Note: This joint Cybersecurity Advisory is part of an ongoing #StopRansomware effort to publish advisories for network defenders that detail various ransomware variants and ransomware threat actors. These #S