Ransomware Research

CockBlocker Ransomware

CockBlocker is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on November 1, 2016, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
CockBlocker
First Seen
November 1, 2016

How CockBlocker Ransomware Works

Targeted Files

Requires C&C

File Encryption Patterns

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

File extensions added after encryption:

..hannah

Ransom Note and Payment Demands

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

message

Ransom message:

notes/note.txt

Note locations:

OnceOnCompletion

Technical Indicators

Associated Executable Files

The following executable files are associated with CockBlocker ransomware:

  • Cockblocker.exe
  • Ransom.CBlocker.exe
  • cool.exe
  • 6.exe
  • cockblocker.exe
  • mqhjzh.exe
  • aa
  • kYF2iEbnF.xdp
  • 05601599.exe

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About This Analysis

This CockBlocker 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 CockBlocker.

Last updated: July 30, 2025

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