Gunra Ransomware

Description Summary

Conti-codebase derived; has a 2026 CISA advisory (AA26-222A).

Threat Actor

Conti-codebase derived; initial access via Fortinet VPN MFA-bypass; RaaS affiliate program (2026).

Technical Indicators

Encryption Extension
.ENCRT
Encryption Algorithm
ChaCha20 + RSA-4096 with 'step-skip' partial encryption (C/C++)
Ransom Note Name
R3ADM3.txt
Targeted Industries
Manufacturing, Critical infrastructure (cross-sector)
First Seen
April 2025
Last Seen
Active (CISA AA26-222A, Aug 2026)
Geographical Location
Global

MITRE ATT&CK Matrix

Tactic TTP Technique Name
Impact x 2 T1486 Data Encrypted for Impact
T1490 Inhibit System Recovery
Exfiltration x 1 T1567 Exfiltration Over Web Service (leak site)
Initial Access x 2 T1190 Exploit Public-Facing Application
T1078 Valid Accounts