Ransomware Research
Kasper Ransomware
Kasper is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on November 1, 2024, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Biobio.
Quick Facts
- Ransomware Family
- Kasper
- First Seen
- November 1, 2024
- Known Aliases
- Biobio
How Kasper Ransomware Works
Targeted Files
Full extension -> .EMAIL=[kasperskyrans@gmail.com]ID=[A64732D5A3C93318].kasper -> .EMAIL=[biobiorans@gmail.com]ID=[CC3B1F89FAA517E4].biobio
File Encryption Patterns
Kasper modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..kasper..biobioRansom Note and Payment Demands
After encrypting files, Kasper displays ransom notes demanding payment for file recovery:
README kasper.txtRansom message:
notes/README kasper.txt
Note locations:
EveryFolderbiobio ransmoware.txtRansom message:
notes/biobio ransmoware.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with Kasper ransomware:
CC3B1F89FAA517E4.exe
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About This Analysis
This Kasper 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 Kasper.
Last updated: July 30, 2025