Ransomware Research

Amnesia Ransomware

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

Quick Facts

Ransomware Family
Amnesia
First Seen
May 1, 2017

How Amnesia Ransomware Works

Targeted Files

Encrypts first 1Mb

File Encryption Patterns

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

File extensions added after encryption:

..amnesia..@decrypt2017..[Help244@Ya.RU].LOCKED..CTB-Locker..protomolecule@gmx.us..@decrypt_files2017..01..02..[byd@india.com].SON..onion

Ransom Note and Payment Demands

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

fileHOW TO RECOVER ENCRYPTED FILES.TXT

Ransom message:

notes/HOW TO RECOVER ENCRYPTED FILES.TXT

Note locations:

EveryFolder
fileRECOVER-FILES.HTML

Ransom message:

notes/RECOVER-FILES.HTML

Note locations:

EveryFolder
file!__П_Р_О_Ч_Т_И__CTB-Locker__ПРОЧТИ__ПРОЧТИ.TXT

Technical Indicators

Associated Executable Files

The following executable files are associated with Amnesia ransomware:

  • guide.exe
  • update.exe
  • Happier.exe
  • risk0805_d101_cr174.exe
  • bstarb.exe

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About This Analysis

This Amnesia 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 Amnesia.

Last updated: July 30, 2025

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