[Ragnar Locker](https://attack.mitre.org/software/S0481) is a ransomware that has been in use since at least December 2019.(Citation: Sophos Ragnar May 2020)(Citation: Cynet Ragnar Apr 2020)
Platforms: Windows
MITRE ATT&CK® is a registered trademark of The MITRE Corporation. © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.