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:
info.txt
Ransom message:
notes/info.txt
Note locations:
RootDiscs
Desktop
info.hta
Ransom message:
notes/info.hta
Note locations:
RootDiscs
Desktop
Arcus-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