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
How Scarab-Osk ransomware works
File encryption patterns
Scarab-Osk modifies encrypted files using specific patterns to mark them as encrypted:
Ransom note and payment demands
After encrypting files, Scarab-Osk displays ransom notes demanding payment for file recovery:
notes/HOW TO RECOVER ENCRYPTED FILES.TXT
About this analysis
This Scarab-Osk ransomware analysis is part of Elastio's comprehensive ransomware detection database. Elastio provides advanced ransomware protection and recovery, helping organizations defend against and recover from ransomware attacks like Scarab-Osk.
Last updated: December 30, 2025
Elastio detects Scarab-Osk inside your data and backups.
The Hunt Engine uses Deep File Inspection to identify Scarab-Osk across live data, replicated data, and backups. If this family is in your environment, Elastio finds it before encryption completes. Run a scan against your recovery points to confirm.
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