Ransomware Research

KesLan Ransomware

KesLan is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on November 1, 2019, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: KesLan, MMRansom, ZZZZZZZZZZ, TurkishRansom, TRSomware.

Quick Facts

Ransomware Family
KesLan
First Seen
November 1, 2019
Known Aliases
KesLanMMRansomZZZZZZZZZZTurkishRansomTRSomware

How KesLan Ransomware Works

Targeted Files

https://app.any.run/tasks/48d75938-739f-495f-a630-83aee786c790/

File Encryption Patterns

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

File extensions added after encryption:

..TMTEAM..TRSomware..MMTeam..Sifrelendi..TR

Ransom Note and Payment Demands

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

fileDosyalarını Kurtarmak İstiyorsan Oku!!!.txt

Ransom message:

notes/Dosyalarını Kurtarmak İstiyorsan Oku!!!.txt

Note locations:

Desktop
file@Lütfen Beni Oku!@.txt

Ransom message:

notes/@Lütfen Beni Oku!@.txt

Note locations:

UserFolders
screenshot

Ransom message:

notes/wallpaper.bmp

Note locations:

Desktop

Technical Indicators

Associated Executable Files

The following executable files are associated with KesLan ransomware:

  • ZZZZZZZZZZ.exe
  • tempasd456.exe
  • 57yhyh.exe
  • ZZZZZZZZZZ(1).exe
  • vicswors.vbs
  • WindowsFormsApp.exe
  • ZZZZZZZZZZ(4).exe
  • ZZZZZZZZZZ.bin
  • @MMDecrypt0r@.exe
  • @mmdecrypt0r@.exe
  • Hacks.bin

Recovery and Decryption Tools

Good news! Decryption tools are available for KesLan ransomware:

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About This Analysis

This KesLan 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 KesLan.

Last updated: July 30, 2025

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KesLan Ransomware - Detectable by Elastio