fileransom.rtf
notes/ransom.rtf
Location: Temp
Ransomware Research
Fenrir Ransomware
Fenrir is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on July 1, 2017, this ransomware has been actively targeting systems worldwide.
Quick facts
- Ransomware Family
- Fenrir
- First Seen
- July 1, 2017
How Fenrir ransomware works
File modification behavior
Fenrir updates file modification timestamps after encryption.
File encryption patterns
Fenrir modifies encrypted files using specific patterns to mark them as encrypted:
Extensions added after encryption
- ./\.[0-9A-F]{10}$/
Ransom note and payment demands
After encrypting files, Fenrir displays ransom notes demanding payment for file recovery:
message
notes/note.txt
Location: OnceOnCompletion
Technical indicators
Associated executable files
The following executable files are associated with Fenrir ransomware:
- Adobe Reader.exe
About this analysis
This Fenrir ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery, helping organizations defend against and recover from ransomware attacks like Fenrir.
Detection coverage
Elastio detects Fenrir inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify Fenrir across live data, replicated data, and backups. If this family is in your environment, Elastio finds it before encryption completes. Run a hunt against your recovery points to confirm.