Ransomware Research

RCRU64 Ransomware

RCRU64 is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on April 1, 2021, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
RCRU64
First Seen
April 1, 2021

How RCRU64 Ransomware Works

File Encryption Patterns

RCRU64 modifies encrypted files using specific patterns to mark them as encrypted:

File extensions added after encryption:

./\[ID=\w+-Mail=.+\]\.\w{4}/

Ransom Note and Payment Demands

After encrypting files, RCRU64 displays ransom notes demanding payment for file recovery:

fileRead_Me!_.txt

Ransom message:

notes/Read_Me!_.txt

Note locations:

EveryFolder
fileReadMe_Now!.hta

Ransom message:

notes/ReadMe_Now!.hta

Note locations:

DesktopStartUp

Technical Indicators

Associated Executable Files

The following executable files are associated with RCRU64 ransomware:

  • RCRU_64.exe
  • Desktopini.exe
  • kamira99@tutanota.com.exe
  • file.exe
  • Leoxrinse234@mailfence.com.exe_.exe

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About This Analysis

This RCRU64 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 RCRU64.

Last updated: September 30, 2025

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