Ransomware Research
Is Ransomware
Is is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on September 1, 2019, this ransomware has been actively targeting systems worldwide. Security researchers also track this malware under the aliases: EvaRichter.
Quick Facts
- Ransomware Family
- Is
- First Seen
- September 1, 2019
- Known Aliases
- EvaRichter
How Is Ransomware Works
File Encryption Patterns
Is modifies encrypted files using specific patterns to mark them as encrypted:
File extensions added after encryption:
./\.[A-Za-z0-9]{5}$/Ransom Note and Payment Demands
After encrypting files, Is displays ransom notes demanding payment for file recovery:
/^[A-Za-z0-9]{5}_how_to_decrypt\.txt$/Ransom message:
notes/G7ZnJ_how_to_decrypt.txt
Note locations:
EveryFolderTechnical Indicators
Associated Executable Files
The following executable files are associated with Is ransomware:
IsIs.exeEva Richter Bewerbung und Lebenslauf.pdf.exe
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About This Analysis
This Is 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 Is.
Last updated: October 30, 2025
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