Ransomware Research

Arcus Ransomware

Arcus is a malicious ransomware strain that encrypts victim files and demands ransom payment for decryption. First observed in the wild on November 1, 2024, this ransomware has been actively targeting systems worldwide.

Quick Facts

Ransomware Family
Arcus
First Seen
November 1, 2024

How Arcus Ransomware Works

Targeted Files

Full extension -> .id[C63F241F-3537].[arcustm@proton.me].Arcus [Encrypted].Arcus

File Encryption Patterns

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

File extensions added after encryption:

..Arcus

Ransom Note and Payment Demands

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

fileinfo.txt

Ransom message:

notes/info.txt

Note locations:

RootDiscsDesktop
fileinfo.hta

Ransom message:

notes/info.hta

Note locations:

RootDiscsDesktop
fileArcus-ReadMe.txt

Ransom message:

notes/Arcus-ReadMe.txt

Note locations:

EveryFolder

Technical Indicators

Associated Executable Files

The following executable files are associated with Arcus ransomware:

  • program.exe
  • AntiRecuvaDb.exe

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About This Analysis

This Arcus 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 Arcus.

Last updated: July 30, 2025

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