777 Ransomware
777 is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2015, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Legion (Seven Legion).
Quick facts
How 777 ransomware works
File encryption patterns
777 modifies encrypted files using specific patterns to mark them as encrypted:
Ransom note and payment demands
After encrypting files, 777 displays ransom notes demanding payment for file recovery:
notes/read_this_file.txt
Recovery and decryption tools
Decryption tools may be available for 777. Review the resources below:
About this analysis
This 777 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 777.
Last updated: December 30, 2025
Elastio detects 777 inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify 777 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.
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