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

Targeted Files

Fake encryption;Destroys the files

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:

file/^[A-Za-z0-9]{5}_how_to_decrypt\.txt$/

Ransom message:

notes/G7ZnJ_how_to_decrypt.txt

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with Is ransomware:

  • Is
  • Is.exe
  • Eva Richter Bewerbung und Lebenslauf.pdf.exe

Elastio Can Help You

Don't let Is ransomware take over your data

Elastio provides advanced ransomware protection and recovery solutions to keep your organization safe.

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: July 30, 2025

Is Ransomware - Detectable by Elastio