Ransomware Research

NK Ransomware

NK is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on October 1, 2024, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
NK
First Seen
October 1, 2024

How NK Ransomware Works

File Encryption Patterns

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

File extensions added after encryption:

./\.[a-z0-9]{4}$/

Ransom Note and Payment Demands

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

fileread_it.txt

Ransom message:

notes/read_it.txt

Note locations:

EveryFolder
screenshot

Ransom message:

notes/o3x9gy783.jpg

Note locations:

Desktop

Technical Indicators

Associated Executable Files

The following executable files are associated with NK ransomware:

  • 기준.exe
  • svchost.exe
  • nkorea_protected.exe

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About This Analysis

This NK 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 NK.

Last updated: July 30, 2025

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