Ransomware Research
Surtr Ransomware
Surtr is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on December 1, 2021, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- Surtr
- First Seen
- December 1, 2021
How Surtr Ransomware Works
Targeted Files
Doesn't encrypt %SystemDrive%
File Encryption Patterns
Surtr modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..SURT..surtrRansom Note and Payment Demands
After encrypting files, Surtr displays ransom notes demanding payment for file recovery:
SURTR_README.htaRansom message:
notes/SURTR_README.hta
Note locations:
EveryFolderSURTR_README.txtRansom message:
notes/SURTR_README.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with Surtr ransomware:
surtr.binSurtr.exe
Elastio Can Help You
Don't let Surtr ransomware take over your data
Elastio provides advanced ransomware protection and recovery solutions to keep your organization safe.
About This Analysis
This Surtr ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery solutions, helping organizations defend against and recover from ransomware attacks like Surtr.
Last updated: July 30, 2025