How to Remove Cyberex Ransomware and Restore .LOCKEDBYCR Files?

Introduction

Cyberex—a variant of the notorious Chaos ransomware family—has emerged as a potent cyberthreat, targeting systems worldwide and encrypting vital files with the .LOCKEDBYCR extension. Once files are locked, victims encounter a ransom note titled README.LOCKEDBYCR.txt, demanding payment in cryptocurrency. As ransomware attacks become more sophisticated, recovering data remains a challenging endeavor for individuals and organizations alike.

This guide delves into the inner workings of Cyberex (Chaos), its impact, and viable recovery strategies.

Related article: How to Remove Proxima / Black Ransomware and Recover .black Files?

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Cyberex Decryptor Tool: A Specialized Recovery Solution

Our Cyberex Decryptor is built specifically for the Chaos variant, enabling victims to restore encrypted data without succumbing to ransom demands. The tool supports files encrypted with the .LOCKEDBYCR extension and operates via a secure, server-supported decryption process. It allows recovery from desktops, servers, and network-attached storage (NAS) devices—often prime targets of ransomware attacks.

Also read: How to Remove Basta Ransomware and Restore .[ID].[basta2025@onionmail.com].basta Files?

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Cyberex Ransomware Attack on ESXi Environments

What Is Cyberex for ESXi?
This variant targets VMware ESXi hypervisors, encrypting virtual machines and critical data. Infested ESXi hosts may bring down entire virtual environments, causing operational chaos.

Key Features & Attack Patterns

• ESXi-specific targeting: Exploits vulnerabilities in VMware ESXi to access and encrypt virtual disks.
  
• Encryption: Uses strong encryption algorithms like AES combined with RSA to scramble data.
  
• Ransom Demand: Leaves README.LOCKEDBYCR.txt with cryptocurrency payment instructions and a countdown timer.
  

Risks to Virtual Infrastructure
Attacks on ESXi can cripple entire virtual environments, shut down business operations, and result in significant financial damages.

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Cyberex Ransomware Attack on Windows Servers

Focusing on Windows-Based Systems
Cyberex effectively infiltrates and encrypts files on Windows servers, even within file shares and databases.

Modus Operandi

1. Exploitation: Leverages vulnerabilities or weak RDP credentials to gain admin access.
   
2. Encryption: Applies AES–RSA schemes to lock data on servers.
   
3. Extortion: Leaves ransom note demanding cryptocurrency for the decryption key.
   

Impact

• Severe disruption to server-dependent operations
  
• Financial downtime from halted services
  
• Sensitive data becomes inaccessible, posing compliance risks
  

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Using the Cyberex Decryptor Tool

Our tool identifies the ransomware’s encryption pattern and communicates with secure servers to retrieve or reconstruct necessary keys.

Step-by-Step Guide:

1. Acquire the Tool – Send a purchase request through email or WhatsApp.
   
2. Run as Admin – Start the decryptor with administrative privileges and internet access.
   
3. Provide Victim ID – Extracted from README.LOCKEDBYCR.txt.
   
4. Start Decryption – Let the tool restore files automatically.

Also read: How to Decrypt Money Message Ransomware Files (.rgPrGzyZY Extension)?

Why Choose the Cyberex Decryptor?

• User-friendly interface
  
• Remote server-based decryption avoids overloading your system
  
• Specialized for the Chaos (Cyberex) variant
  
• Guaranteed data integrity
  
• Money-back guarantee if decryption fails
  

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Identifying a Cyberex Ransomware Attack

Recognizing an attack early reduces impact. Look out for:

• File Renaming with .LOCKEDBYCR extension
  
• Ransom Note: README.LOCKEDBYCR.txt detailing instructions

Ransom note message:

Your organization has been impacted by a Hacker’s attack!

All Your Files has been Encrypted.

We are using Military Grade Encryption Algorithms.

That means the files can’t be decrypted without our decryption tool.

Valuble Data has been copyed to OUR Servers.

To recover your data and prevent data leakage you must contact us within 48 hours.

To start negotiating you need to download:

https://www.torproject.org/download

Then open one of link below to start Chat:

<.onion links redacted>

You have no choice other than to negotiate with us.

Screenshot of the ransom note:

• System Slowdown: CPU and disk usage spikes during encryption
  
• Unusual Network Traffic: Outbound communication to attacker servers
  

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Known Victims and Impact

Although disclosure remains limited, multiple organizations—spanning finance, healthcare, and manufacturing—have reported Chaos/Cyberex infections. These incidents demonstrate how even well-defended infrastructures can fall victim without robust cybersecurity hygiene.

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Encryption Methods Used by Cyberex

Cyberex employs AES for file-level encryption, securing each file with a unique AES key. These keys are then encrypted with RSA using the attacker’s public key. Decrypting files without the private key is virtually impossible.

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Unified Cyberex Protection Across Environments

1. Patch and Update Regularly
   
   • Keep ESXi, Windows servers, and all software updated
     
   • Apply vendor security advisories swiftly
     
2. Strengthen Access Controls
   
   • Use strong passwords and Multi-Factor Authentication (MFA)
     
   • Restrict RDP and admin access to trusted sources
     
3. Network Segmentation
   
   • Use VLANs and firewalls to isolate critical systems
     
   • Block SMB/RDP from untrusted networks
     
4. Robust Backups
   
   • Follow the 3-2-1 rule: 3 copies, 2 formats, 1 off-site
     
   • Test restores regularly
     
5. Deploy Endpoint Security
   
   • Use EDR solutions and anti-malware on all endpoints and virtual hosts
     
6. Employee Training
   
   • Educate staff to spot phishing and malicious downloads
     
7. Advanced Defenses
   
   • Implement IDS/IPS and monitor for anomalous activity
     
   • Maintain an incident response plan
     

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Attack Cycle of Cyberex Ransomware

1. Infiltration: Phishing or RDP vulnerabilities
   
2. Elevate Privileges: Attacker gains admin rights
   
3. Lateral Movement: Expands across network
   
4. Encryption: Applies AES + RSA
   
5. Ransom Note: Drops README.LOCKEDBYCR.txt
   
6. Extortion & Threats: Sets a deadline
   
7. Leak Threat: Promises data leak if unpaid
   

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Consequences of a Cyberex Attack

• Operational Disruption: Systems and services halted
  
• Financial Loss: Including ransom and recovery costs
  
• Data Safety: Risk of leakage or compliance breaches
  

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Free Alternative Recovery Methods

• No More Ransom: Check for free decryptors
  
• Backup Restoration: Restore from clean, offline sources
  
• Shadow Copies: For Windows, use vssadmin to list and restore
  
• System Restore: Revert Windows to pre-attack points
  
• Recovery Tools: Tools like Recuva or PhotoRec may recover data remnants
  
• Seek Expert Help: Contact cybersecurity firms or law enforcement (e.g., local CERT, FBI)
  

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Conclusion

Cyberex (Chaos variant) is a powerful ransomware strain that poses a serious threat to virtualized and physical environments alike. Though its encryption processes are strong, recovery is possible with tools like the Cyberex Decryptor—backed by professional guidance and prevention strategies. By implementing layered defenses and reliable restoration methods, organizations can safeguard critical data and respond effectively to ransomware attacks.

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Frequently Asked Questions

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