Fs0ciety Locker Ransomware Analysis
By Elastio
Published: 2025-07-30 · Archived: 2026-04-05 14:10:09 UTC
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Ransomware Research
Fs0ciety Locker is a malicious ransomware strain that encrypts victim files and demands ransom payment for
decryption. First observed in the wild on September 1, 2016, this ransomware has been actively targeting systems
worldwide.
Quick facts
Ransomware Family
Fs0ciety Locker
First Seen
September 1, 2016
How Fs0ciety Locker ransomware works
File encryption patterns
Fs0ciety Locker modifies encrypted files using specific patterns to mark them as encrypted:
Extensions added after encryption
.realfs0ciety@sigaint.org.fs0ciety
Ransom note and payment demands
After encrypting files, Fs0ciety Locker displays ransom notes demanding payment for file recovery:
filefs0ciety.html
notes/fs0ciety.html
Location: RansomPayloadStartFolder
https://elastio.com/detectable-ransomware/fs0ciety-locker/
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Technical indicators
Associated executable files
The following executable files are associated with Fs0ciety Locker ransomware:
driver_update.exe
driver_update[1].exe
Invoice_payment.docm
About this analysis
This Fs0ciety Locker 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 Fs0ciety Locker.
Last updated: December 30, 2025
Detection coverage
Elastio detects Fs0ciety Locker inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify Fs0ciety Locker 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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Source: https://elastio.com/detectable-ransomware/fs0ciety-locker/
https://elastio.com/detectable-ransomware/fs0ciety-locker/
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