Ransomware Research
Jaffe Ransomware
Jaffe is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on November 1, 2018, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Kolet.
Quick Facts
- Ransomware Family
- Jaffe
- First Seen
- November 1, 2018
- Known Aliases
- Kolet
How Jaffe Ransomware Works
Targeted Files
Encrypts every 0x2000 bytes
File Encryption Patterns
Jaffe modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..[Jaffe@Tuta.Io]..[Kolet@Tuta.Io]Ransom Note and Payment Demands
After encrypting files, Jaffe displays ransom notes demanding payment for file recovery:
READ THIS.TXTRansom message:
notes/READ THIS.TXT
Note locations:
EveryFolderREAD ME PLEASE!.TXTRansom message:
notes/READ ME PLEASE!.TXT
Technical Indicators
Associated Executable Files
The following executable files are associated with Jaffe ransomware:
agent.exe
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About This Analysis
This Jaffe 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 Jaffe.
Last updated: July 30, 2025