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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:
how_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
Elastio Can Help You
Don't let CryLock ransomware take over your data
Elastio provides advanced ransomware protection and recovery solutions to keep your organization safe.
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