Ransomware Research
CruelCrypt Ransomware
CruelCrypt 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
- CruelCrypt
- First Seen
- April 1, 2020
How CruelCrypt Ransomware Works
Targeted Files
Based on BAT file and "certutil" tool
File Encryption Patterns
CruelCrypt modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..Cruel..SisterTechnical Indicators
Associated Executable Files
The following executable files are associated with CruelCrypt ransomware:
fun.exe
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About This Analysis
This CruelCrypt 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 CruelCrypt.
Last updated: July 30, 2025