Ransomware Research

CobraLocker Ransomware

CobraLocker is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on June 1, 2020, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Cobra, CobraLocker NextGen, Cobra_Locker2.0, Cobra_Locker3.0, Cobra_Locker4.0, CobraLocker CryptoToys.

Quick Facts

Ransomware Family
CobraLocker
First Seen
June 1, 2020
Known Aliases
CobraCobraLocker NextGenCobra_Locker2.0Cobra_Locker3.0Cobra_Locker4.0CobraLocker CryptoToys

How CobraLocker Ransomware Works

File Encryption Patterns

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

File extensions added after encryption:

..Cobra..IT..c0br4..DaVinci..Lock..LGNLCKD..hacked..aes

Ransom Note and Payment Demands

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

fileLegionReadMe.txt

Ransom message:

notes/LegionReadMe.txt

Note locations:

UserFolders
fileReadme.txt

Ransom message:

notes/Readme.txt

Note locations:

Desktop
fileindex.html

Ransom message:

notes/index.html

Note locations:

Desktop
message

Ransom message:

notes/note.txt

Note locations:

OnceOnCompletion

Technical Indicators

Associated Executable Files

The following executable files are associated with CobraLocker ransomware:

  • Ransomware.exe
  • IT.exe
  • it.exe
  • DaVinci.exe
  • CoronaDecrypt0r.exe
  • CoronaCrypt0r.exe
  • BlackMamba2.exe
  • BlackMamba2.0.exe
  • ransomware.exe
  • ransomware.bin
  • AmongUs.exe
  • AmongUs.bin
  • Niros.exe
  • LegionLocker3.0.exe
  • WannaMad.exe
  • LegionLocker3.0

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About This Analysis

This CobraLocker 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 CobraLocker.

Last updated: October 30, 2025

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