SYSDF Ransomware
SYSDF is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2024, this ransomware has been actively targeting systems worldwide.
Quick facts
How SYSDF ransomware works
File encryption patterns
SYSDF modifies encrypted files using specific patterns to mark them as encrypted:
Ransom note and payment demands
After encrypting files, SYSDF displays ransom notes demanding payment for file recovery:
notes/README!.txt
notes/Info.hta
Technical indicators
Associated executable files
The following executable files are associated with SYSDF ransomware:
- SYSDEFENDER.EXE
About this analysis
This SYSDF 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 SYSDF.
Last updated: December 30, 2025
Elastio detects SYSDF inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify SYSDF across live data, replicated data, and backups. If this family is in your environment, Elastio finds it before encryption completes. Run a scan against your recovery points to confirm.
Recent ransomware
Explore other threats in our database