Ransomware Research

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

Ransomware Family
777
First Seen
September 1, 2015
Known Aliases
  • Legion (Seven Legion)

How 777 ransomware works

File modification behavior

777 updates file modification timestamps after encryption.

File encryption patterns

777 modifies encrypted files using specific patterns to mark them as encrypted:

Extensions added after encryption
  • .777
  • .legion

Ransom note and payment demands

After encrypting files, 777 displays ransom notes demanding payment for file recovery:

fileread_this_file.txt
notes/read_this_file.txt

Location: Desktop

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: March 26, 2025

Detection coverage

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 hunt against your recovery points to confirm.