Ransomware Research

16Z Ransomware

16Z is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2026, this ransomware has been actively targeting systems worldwide.

Quick facts

Ransomware Family
16Z
First Seen
February 1, 2026

How 16Z ransomware works

File modification behavior

16Z updates file modification timestamps after encryption.

File encryption patterns

16Z modifies encrypted files using specific patterns to mark them as encrypted:

Extensions added after encryption
  • .fkby16z

Ransom note and payment demands

After encrypting files, 16Z displays ransom notes demanding payment for file recovery:

fileHUONG_DAN_GIAI_MA.txt
notes/HUONG_DAN_GIAI_MA.txt

Location: EveryFolder

Technical indicators

Associated executable files

The following executable files are associated with 16Z ransomware:

  • z2.exe
  • 3s5dk.exe

About this analysis

This 16Z 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 16Z.

Last updated: May 6, 2026

Detection coverage

Elastio detects 16Z inside your data and backups.

The Hunt Engine uses Deep File Inspection to identify 16Z 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.