Ransomware Research
Phobos-SDK Ransomware
Phobos-SDK is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on April 1, 2023, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: SDK.
Quick Facts
- Ransomware Family
- Phobos-SDK
- First Seen
- April 1, 2023
- Known Aliases
- SDK
How Phobos-SDK Ransomware Works
Targeted Files
Full extension -> .id[C63F241F-3449].[sdk@africamail.com].SDK
File Encryption Patterns
Phobos-SDK modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
..SDKRansom Note and Payment Demands
After encrypting files, Phobos-SDK displays ransom notes demanding payment for file recovery:
info.htaRansom message:
notes/info.hta
Note locations:
RootDiscsDesktopinfo.txtRansom message:
notes/info.txt
Note locations:
RootDiscsDesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with Phobos-SDK ransomware:
BackupService.exe
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About This Analysis
This Phobos-SDK 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 Phobos-SDK.
Last updated: July 30, 2025