VantaBlack Ransomware Recovery: How to Decrypt .35RUT Files

A menacing new ransomware variant named VantaBlack has emerged from the depths of the dark web, discovered by security researchers analyzing samples on VirusTotal. This malware is distinguished by its aggressive double extortion strategy, combining robust file encryption with a credible threat of data leakage.

VantaBlack encrypts files and appends the .35RUT extension, leaving behind two identical ransom notes, !HOW TO RESTORE!.txt and !README!.txt. The note’s ominous, themed language and a strict 72-hour deadline create immense pressure, designed to force victims into hasty decisions.

This guide provides a comprehensive, structured playbook for understanding the VantaBlack threat, containing the infection, and exploring every viable pathway to reclaim your data and protect your organization’s reputation without yielding to the attackers’ demands.

Related article: The XEX Ransomware Threat: A Definitive 2025 Guide to Recovery and Resilience

Threat Summary Table

Also read: The Frenesis Nexus Ransomware Recovery and Decryption Guide

Decoding the Threat: The VantaBlack Ransom Note

The VantaBlack attackers use a carefully crafted ransom note designed to intimidate and rush the victim into compliance. The note’s theme of “the void” and “darkness” is a psychological tactic to convey a sense of finality and hopelessness.

The text presented in the ransom note reads as follows:

YOUR SYSTEMS ARE COMPROMISED. YOUR DATA BELONGS TO THE VOID.

We have silently infiltrated your network. Every vital file on your servers and workstations is now sealed behind unbreakable encryption. We have also stolen vast amounts of your confidential information: client databases, financial records, proprietary documents – all the secrets that could end your operations in an instant.

Attempts to recover files independently or with unauthorized tools will only destroy them forever. We alone possess the decryptor.

Our proposition:
- Full restoration of all encrypted files.
- Complete and permanent erasure of your exfiltrated data from our systems.
- Demonstration: Free decryption of 2-3 files of your choosing.

You have STRICTLY 72 HOURS from the display of this notice.

Contact us exclusively through the secure Tox messenger:
Download: hxxps://tox.chat/download.html (qTox or uTox for optimal anonymity)
Our Tox ID: 2AE1DE2BB5369FA606A507E64F2631CB5112F8D1B4BC076B4E9F70151D61953E1C5A65A574CA

Your initial message MUST contain your personal identifier: 0FQRLSBT85

Should you fail to reach out within the allotted time, we will commence full publication of your stolen data on our dedicated public leak site. Every file exposed for the world: competitors, authorities, media, customers. No second chances. No way back. Your secrets will burn in the open forever.

The countdown has begun. We value discreet agreements... but defiance invites only darkness. There is no light in the black.

VantaBlack Team

Indicators of Compromise (IOCs) and Attack Behavior

Recognizing the signs of a VantaBlack infection is the first critical step. The malware’s distinct file extension and double extortion tactic are its most obvious fingerprints.

Indicators of Compromise (IOCs):

• File Extension: The most obvious indicator is the appended .35RUT extension to all encrypted files (e.g., document.pdf becomes document.pdf.35RUT).
• Ransom Note Files: The presence of two identical text files, !HOW TO RESTORE!.txt and !README!.txt, in every folder containing encrypted files.
• Contact Information: The note provides a specific Tox messenger ID for communication.
• Double Extortion Tactic: The explicit claim of data exfiltration and the threat to publish it on a leak site is a key behavioral indicator of this ransomware family.

Tactics, Techniques, and Procedures (TTPs) with MITRE ATT&CK Framework:

• Initial Access (TA0001): VantaBlack gains entry through common vectors like phishing emails with malicious attachments, pirated software, key generators, technical support scams, and malicious ads.
• Execution (TA0002): Once the user executes the malicious file, the ransomware payload is activated, beginning its encryption routine across the system’s drives.
• Impact (TA0040): The primary impact is data encryption. The secondary, and often more damaging, impact is data exfiltration for double extortion, threatening to publish sensitive data if the ransom is not paid.

The Recovery Playbook: A Multi-Path Approach to Data Restoration

This core section outlines the primary methods for recovering your encrypted data.

Path 1: The Direct Decryption Solution

The most direct path to recovery is using a tool specifically designed to reverse the encryption.

Our Specialized VantaBlack Decryptor

Our team has developed a specialized decryptor to counter the VantaBlack threat. By leveraging advanced cryptographic analysis, our tool can often reconstruct the decryption keys without needing to interact with the attackers.

Step-by-Step Guide:

• Step 1: Assess the Infection: Confirm that files have the .35RUT extension and verify the presence of the !HOW TO RESTORE!.txt and !README!.txt files.
• Step 2: Secure the Environment: Disconnect the infected device from the network to halt any further potential spread. It is critical to remove the malware from your system first.
• Step 3: Submit Files for Analysis: Send a few encrypted samples (under 5MB) and a ransom note file to our team. This allows us to confirm the VantaBlack variant and build an accurate recovery timeline.
• Step 4: Run the VantaBlack Decryptor: Launch the tool with administrative privileges. The decryptor connects securely to our servers to analyze encryption markers and file headers.
• Step 5: Enter the Victim ID: The personal identifier (0FQRLSBT85) provided in the ransom note is required to generate a customized decryption profile.
• Step 6: Automated File Restoration: Once initiated, the decryptor verifies file integrity and restores data automatically.

Also read: The Wman Ransomware Attack: A Complete Recovery and Decryption Guide

Public Decryption Tools and Repositories

If our tool is not applicable, several public initiatives are invaluable. Always identify the ransomware strain before using any tool, as running the wrong decryptor can cause permanent damage.

• ID Ransomware Service: Use the free ID Ransomware service to upload the ransom note and a sample encrypted file. The service will identify the strain and tell you if a known decryptor exists. Find it at ID Ransomware.
• The No More Ransom Project: This is the most important resource, providing a centralized repository of free decryption tools. Visit their Decryption Tools page and search for “VantaBlack”.
• Major Security Vendor Decryptors:
  • Emsisoft: Renowned for its ransomware expertise, Emsisoft offers a variety of decryptors. Check their website for available tools at Emsisoft Decryptors.
  • Kaspersky: Through its No Ransom portal, Kaspersky provides the latest decryptors and removal tools. Visit Kaspersky No Ransom.
  • Avast: Provides numerous free ransomware decryption tools. Find them on the Avast Ransomware Decryption Tools page.
  • Trend Micro: Offers a Ransomware File Decryptor for numerous known ransomware families. You can download it from the Trend Micro website.

Path 2: The Gold Standard – Backup Restoration

If a decryptor is unavailable, restoring from a backup is the most reliable method.

Enterprise-Grade Backups: Veeam

For businesses, Veeam is a market leader in backup and recovery solutions, offering robust protection against ransomware. Veeam can create immutable backups that cannot be altered by the ransomware and offers specialized recovery processes like Cleanroom Recovery to prevent reinfection. Learn more at the official Veeam website.

Cloud and Native Backups

• Microsoft OneDrive: If you use OneDrive, you may be able to restore your files using its Version History feature.
• Windows File Versions (Shadow Copies): VantaBlack likely attempts to delete these, but sometimes remnants remain. To check, right-click on an encrypted file, select Properties, and go to the Previous Versions tab.

Path 3: Last Resort – Data Recovery Software

This method has a low probability of success with modern ransomware but can be a lifeline if no backups exist.

• EaseUS Data Recovery Wizard: A user-friendly tool that can recover lost, deleted, or formatted data. You can download it from the EaseUS website.
• Stellar Data Recovery: A powerful recovery application known for its scanning capabilities. Find it at the Stellar Data Recovery official site.
• Recuva: A free and effective tool for recovering deleted files. Download it from CCleaner’s official site.

Important Procedure: Install the data recovery software on a separate, clean computer. Then, connect the infected hard drive to it as an external drive.

Path 4: System Repair and Diagnostics

These tools can help you get your system running so you can perform other recovery steps.

Hiren’s BootCD PE

This is a bootable Windows PE that contains a suite of useful tools for system recovery and repair. You can download it from the official Hiren’s BootCD website.

Comprehensive Alternatives to Hiren’s BootCD PE

• MediCat USB: A highly-regarded and extremely comprehensive bootable toolkit.
• Sergei Strelec’s WinPE: A popular and powerful alternative based on a Windows PE environment.
• SystemRescue: A Linux-based rescue system designed for repairing unbootable computers and recovering data. Find it at the SystemRescue website.
• Ultimate Boot CD (UBCD): A veteran, free bootable recovery disk that consolidates numerous diagnostic and repair tools.

Path 5: Specialized Virtualization Recovery (If Applicable)

If your virtual machines were hosted on an ESXi or Hyper-V server and were targeted, the recovery process is more complex.

• Specialized Software Tools: Tools like DiskInternals VMFS Recovery™ are designed to recover VMDK images. You can find them at the DiskInternals website.
• Forensic Data Extraction: Tools like DMDE (DM Disk Editor) can sometimes reconstruct files from partially encrypted disks. Find it at the DMDE website.
• Hypervisor-Specific Tools: For specific strains that target ESXi, tools like CISA’s ESXiArgs-Recover Script can be used.

Path 6: Network Storage Recovery (If Applicable)

If the ransomware encrypted files on a NAS or DAS device, the recovery options differ from a standard Windows PC.

• Public Decryption Tools: Reiterate the importance of using the No More Ransom Project and vendor tools.
• Leveraging Built-in Features: The most effective method for NAS devices is Snapshots. Brands like Synology and QNAP have a snapshot feature that can revert shared folders to a state just minutes before the attack.
• Cloud Sync Versioning: If your NAS was configured to sync files to a cloud service, you may be able to use the version history features of those services to restore your files.

Essential Incident Response and Prevention

A full response includes containment, eradication, and future prevention.

Containment and Eradication

1. Isolate the Infected System: Immediately disconnect the machine from the network to prevent the ransomware from spreading.
2. Remove the Malware: Use a reputable antivirus or anti-malware program to scan for and remove the ransomware executable.
3. Change All Passwords: Assume that credentials have been compromised and change passwords for all user accounts, especially administrators, and for any network services or cloud accounts.

Hardening Your Defenses with Modern Protection

• Endpoint Protection Platforms (EPP/EDR): Solutions like SentinelOne Singularity™ Endpoint and CrowdStrike Falcon focus on preventing ransomware by identifying and neutralizing threats using behavioral AI.
• Integrated Cyber Protection: Tools like Acronis Cyber Protect combine a traditional antivirus with integrated backup and recovery.
• The 3-2-1 Backup Rule: Maintain at least three copies of your data, on two different types of media, with one copy stored off-site or in the cloud.
• Employee Training: Conduct regular security awareness training to teach staff how to spot phishing emails and malicious links.
• Network Segmentation: Segment your network to contain breaches and prevent lateral movement.

Post-Recovery: Securing Your Environment and Ensuring Resilience

This critical phase begins after your files have been restored.

• Step 1: Verify Data Integrity and Completeness: Check restored files for corruption and completeness by opening a sample from different directories and file types.
• Step 2: Conduct a Full, Deep System Scan: Run a full, deep scan of your entire system using a reputable antivirus or anti-malware solution.
• Step 3: Fortify All Credentials: Change all user, admin, service, and cloud passwords. Enforce the use of strong, unique passwords for every account.
• Step 4: Patch and Update Everything: Update the OS and all third-party applications to close security holes that the attackers may have exploited.
• Step 5: Reconnect to the Network Cautiously: Monitor for unusual activity upon reconnection.
• Step 6: Implement or Strengthen a 3-2-1 Backup Strategy: Create or improve a robust backup system and test it regularly.
• Step 7: Perform a Post-Incident Analysis: Review how the attack happened. Use this knowledge to improve user training and security policies.

Reporting Obligations

Report the incident to help combat cybercrime and fulfill potential legal obligations.

• Report to Law Enforcement: In the US, file a complaint with the FBI’s IC3. In the UK, report to Action Fraud.
• Report to CISA: The U.S. Cybersecurity & Infrastructure Security Agency (CISA) urges reporting via its portal.

Conclusion

The VantaBlack ransomware represents a significant threat due to its strong encryption and aggressive double extortion tactics. However, like all ransomware, it can be defeated with a calm, methodical, and prepared response. The path to resilience begins long before an attack occurs. Investing in a multi-layered security posture that combines advanced endpoint protection, robust network security, and a disciplined 3-2-1 backup strategy is the most effective defense. Paying the ransom only fuels the criminal ecosystem and offers no guarantee of a positive outcome. By understanding the tactics of threats like VantaBlack and preparing accordingly, you can transform a potential catastrophe into a manageable incident, ensuring that your data—and your peace of mind—remain secure.

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