Ransomware Research
UmbreCrypt Ransomware
UmbreCrypt is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on February 1, 2016, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- UmbreCrypt
- First Seen
- February 1, 2016
How UmbreCrypt Ransomware Works
Targeted Files
NOSAMPLE
File Encryption Patterns
UmbreCrypt modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
./\.umbrecrypt_ID_[a-z0-9]{8}\b/Ransom Note and Payment Demands
After encrypting files, UmbreCrypt displays ransom notes demanding payment for file recovery:
/\bREADME_DECRYPT_UMBRE_ID_[a-z0-9]{8}\.txt\b/Ransom message:
notes/note.txt
Note locations:
EveryFolderRansom message:
notes/note.txt
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About This Analysis
This UmbreCrypt 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 UmbreCrypt.
Last updated: July 30, 2025