Ransomware Research
RSAUtil Ransomware
RSAUtil is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on April 1, 2017, this ransomware has been actively targeting systems worldwide.
Quick Facts
- Ransomware Family
- RSAUtil
- First Seen
- April 1, 2017
How RSAUtil Ransomware Works
File Encryption Patterns
RSAUtil modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
./\.ID[0-9]{8}$/Ransom Note and Payment Demands
After encrypting files, RSAUtil displays ransom notes demanding payment for file recovery:
How_return_files.txtRansom message:
notes/How_return_files.txt
Ransom message:
notes/image.jpg
Note locations:
DesktopTechnical Indicators
Associated Executable Files
The following executable files are associated with RSAUtil ransomware:
RSAUtil.exesvchostssvchosts.exersautil.exeRSA_Util.exeкриптер.zipsvhosts.exesvhosts - ?????.exesvhosts.exe.YOU.ID31597842046.vir.exe
Elastio Can Help You
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About This Analysis
This RSAUtil 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 RSAUtil.
Last updated: July 30, 2025