Ransomware Research

CryLock Ransomware

CryLock is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on April 1, 2020, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
CryLock
First Seen
April 1, 2020

How CryLock Ransomware Works

Targeted Files

Full filename -> desktop.ini[reddragon3335799@protonmail.ch][sel3].[EDF8147C-62CC2057] -> [grand@horsefucker.org][3326026783-1743397762].nbf VERTICAL.BAR[hopeandhonest@smime.ninja].[1E3A69B7-1D530015]

File Encryption Patterns

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

File extensions added after encryption:

./\[reddragon3335799@protonmail\.ch\]\[sel3\]\.\[[0-9A-F]{8}-[0-9A-F]{8}\]$/./\[flydragon@mailfence\.com\]\[sel1ru\]\.\[[0-9A-F]{8}-[0-9A-F]{8}\]$/./\[hopeandhonest@smime\.ninja\]\.\[[A-F0-9]{8}-[A-F0-9]{8}\]$/..nbf

Ransom Note and Payment Demands

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

filehow_to_decrypt.hta

Ransom message:

notes/how_to_decrypt.hta

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with CryLock ransomware:

  • svcbba.exe
  • svccbf.exe
  • svckaa.exe
  • svciai.exe
  • svceda.exe
  • svcajx.exe

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About This Analysis

This CryLock 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 CryLock.

Last updated: July 30, 2025

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