Ransomware Research
Scarab-Osk Ransomware
Scarab-Osk is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on May 1, 2018, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: Scarab-Osk-Cosmos, Scarab-Osk-Frogo.
Quick Facts
- Ransomware Family
- Scarab-Osk
- First Seen
- May 1, 2018
- Known Aliases
- Scarab-Osk-CosmosScarab-Osk-Frogo
How Scarab-Osk Ransomware Works
File Encryption Patterns
Scarab-Osk modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..cosmos..frogo..oskRansom Note and Payment Demands
After encrypting files, Scarab-Osk displays ransom notes demanding payment for file recovery:
HOW TO RECOVER ENCRYPTED FILES.TXTRansom message:
notes/HOW TO RECOVER ENCRYPTED FILES.TXT
Note locations:
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About This Analysis
This Scarab-Osk 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 Scarab-Osk.
Last updated: July 30, 2025