Ransomware Research

Estemani Ransomware

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

Quick Facts

Ransomware Family
Estemani
First Seen
February 1, 2019
Known Aliases
Mockba

How Estemani Ransomware Works

Targeted Files

May not add any suffixes https://app.any.run/tasks/b5fc1061-5bc4-4ab3-89f9-c5a3daf01ef2/

File Encryption Patterns

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

File extensions added after encryption:

..mockba

Ransom Note and Payment Demands

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

fileHOW_DECRYPT_FILES.txt

Ransom message:

notes/HOW_DECRYPT_FILES.txt
file@_READ_TO_RECOVER_FILES_@.txt

Ransom message:

notes/@_READ_TO_RECOVER_FILES_@.txt

Note locations:

EveryFolder
file# HOW TO RECOVER YOUR DATA #.txt

Ransom message:

notes/# HOW TO RECOVER YOUR DATA #.txt

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with Estemani ransomware:

  • sam.exe
  • SDelete
  • sdelete.exe
  • YuQ5f0mK.exe
  • qV40a1.exe
  • final.exe

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About This Analysis

This Estemani 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 Estemani.

Last updated: July 30, 2025

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