Ransomware Research

Locky-Ykcol Ransomware

Locky-Ykcol is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2017, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
Locky-Ykcol
First Seen
September 1, 2017

How Locky-Ykcol Ransomware Works

Targeted Files

Renames files -> DF383II7-3P71-D0QK-0119BB06-299D702F8325.ykcol;DF383II7-3P71-D0QK-8ED1D4B5-9CED0D722BA6.ykcol

File Encryption Patterns

Locky-Ykcol modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

..ykcol

Ransom Note and Payment Demands

After encrypting files, Locky-Ykcol displays ransom notes demanding payment for file recovery:

fileykcol.html

Ransom message:

notes/ykcol.htm

Note locations:

Desktop
screenshot

Ransom message:

notes/ykcol.bmp

Note locations:

Desktop

Technical Indicators

Associated Executable Files

The following executable files are associated with Locky-Ykcol ransomware:

  • txdOsXP.exe
  • CJgBjTI.exe
  • 2_.exe
  • rcCzyIyrUzw.exe
  • 87thiuh3gfDGS
  • Ly.exe
  • 11326216544.vbs

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About This Analysis

This Locky-Ykcol ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery solutions, helping organizations defend against and recover from ransomware attacks like Locky-Ykcol.

Last updated: July 30, 2025

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