MedusaLocker3 Ransomware Decryptor
The MedusaLocker3, also known as the Far Attack variant, continues to cripple organizations worldwide, renaming encrypted data with the .lockfile4 extension. To counter this, our cybersecurity division has engineered a dedicated decryptor that restores affected files across Windows servers, Linux machines, and VMware ESXi hosts.
This decryptor has been successfully used by multiple victims and stands apart from unsafe “free” tools circulating online. Every aspect of its design prioritizes data integrity, accuracy, and security.
How Our Decryptor Achieves Recovery
Our recovery tool functions with a multi-layered strategy designed to limit risks and ensure success.
Cloud-Based Analysis with Blockchain Verification
Encrypted samples are uploaded to a secure cloud system where blockchain records confirm and track every decryption step. This prevents tampering and maintains process transparency.
Ransom Note Identification
The ransom note, often named How_to_back_files.html or HOW_TO_RECOVER_DATA.html, provides the victim ID, which our system uses to align the recovery with the exact encryption batch.
Universal Recovery Mode
For situations where ransom notes are deleted or unavailable, a universal decryption engine can still restore files from certain .lockfile4 builds.
Safe Execution Process
Before decryption starts, the tool runs read-only diagnostics, confirming file integrity and minimizing risk of corruption.
Prerequisites Before Launching the Decryptor
- Ransom note samples such as How_to_back_files.html
- A few files encrypted with the .lockfile4 extension
- A stable internet connection for the recovery platform
- Administrator credentials on the compromised system
First Steps After Discovering a MedusaLocker3 Breach
The response in the first hours determines the overall recovery potential.
- Disconnect compromised devices from the network immediately to halt the spread.
- Preserve ransom notes and encrypted files intact. Do not delete them.
- Power down infected servers, but avoid rebooting since some MedusaLocker3 variants trigger additional encryption on startup.
- Retain evidence such as system logs, forensic images, and file hashes for investigation.
- Seek immediate support from professionals experienced in ransomware recovery.
Technical Breakdown of MedusaLocker3 / Far Attack
MedusaLocker3 belongs to the Ransomware-as-a-Service (RaaS) ecosystem. Operators rent the malware to affiliates, who deploy it in exchange for a revenue share.
- It uses AES-256 combined with RSA-2048 to encrypt files.
- Extensions include .lockfile4, .farattack, .itlock, and .busavelock.
- Typical infiltration vectors are exposed RDP services, phishing emails, and unpatched system flaws.
- Once inside, it propagates through SMB shares, PsExec, and remote desktop sessions.
- Victims find multiple ransom notes across affected directories, urging them to connect with attackers via TOR.
Unfortunately, no free public decryptor exists for .lockfile4 as of today.
Options for Recovering Data
Free Recovery Possibilities
Community Tools
Some old MedusaLocker samples have free decryptors available, but they are ineffective against .lockfile4.
Offline Backups
The most reliable free path remains restoring from clean backups stored offline or within immutable cloud storage.
VM Snapshots
For environments with VMware ESXi, reverting to pre-attack snapshots provides an effective restoration method.
File Restoration Utilities
In limited cases, file recovery programs can salvage unencrypted data from free disk space not yet overwritten.
Paid Alternatives
Paying the Ransom
While possible, this approach is not advisable. Attackers may provide defective keys, fail to deliver, or embed backdoors in decryptors.
Negotiator Involvement
Specialized intermediaries sometimes reduce ransom costs and test decryptors beforehand. This is expensive and does not guarantee success.
Our .lockfile4 Decryptor
Our solution eliminates these risks. It is based on:
- Reverse-engineered MedusaLocker3 code logic
- AI-powered victim ID mapping to specific keys
- Blockchain-backed validation of decrypted files
- Both online and offline modes for flexible use
Step-by-Step Process of Recovery with Our Decryptor
- Confirm infection by verifying .lockfile4 extensions and ransom notes.
- Isolate affected endpoints to stop network-wide encryption.
- Provide ransom notes and encrypted samples for expert analysis.
- Run the decryptor in administrator mode, input the victim ID, and begin recovery.
- Choose offline mode for sensitive systems or online mode for rapid decryption support.
The MedusaLocker3 Attack Stages
MedusaLocker3 campaigns typically progress through these phases:
- Entry via phishing, stolen RDP credentials, or vulnerability exploitation.
- Privilege escalation through credential theft tools like Mimikatz or LaZagne.
- Security evasion by disabling antivirus and deleting shadow copies.
- Lateral spread through SMB shares, mapped drives, and remote execution tools.
- Encryption of local and network files with AES-256.
- Ransom notes dropped across directories with instructions to pay.
Indicators of Compromise (IOCs)
- File extensions: .lockfile4, .farattack, .itlock, .busavelock
- Ransom note names: How_to_back_files.html, HOW_TO_RECOVER_DATA.html, !!!HOW_TO_DECRYPT!!!.mht, DATA_RECOVERY.html
- Malware tools used: PsExec, RClone, Mimikatz, Advanced IP Scanner, AnyDesk
- System alterations: Shadow copy removal, scheduled tasks every 15 minutes, registry changes for persistence
- Network activity: Outbound traffic to TOR hidden services and Mega.nz
Strengthening Defenses Against Future Infections
- Enable MFA for all RDP and VPN logins.
- Apply security patches regularly and secure exposed services.
- Use segmentation to protect sensitive servers from lateral movement.
- Block unauthorized PsExec and SMB traffic.
- Deploy EDR solutions with continuous monitoring for unusual behaviors.
Statistical Breakdown of MedusaLocker3 Victims
To visualize the threat landscape, we compiled statistical samples:
Countries Most Affected
Industries Targeted
Timeline of Activity (2023 – 2025)
Example of a Ransom Note
A typical ransom message left by MedusaLocker3 reads:
Your files have been locked using RSA-AES hybrid encryption.
Files now use the extension: .lockfile4
Backups and shadow copies were deleted.
Without our software, recovery is impossible.
To prove decryption works, send up to 2 files (max 2MB) for testing.
Contact us through our TOR site within 72 hours or your data will be leaked.
Victim-ID: [UNIQUE_ID]
Access the portal: http://[TOR-ADDRESS].onion
Conclusion
The MedusaLocker3 / Far Attack variant with .lockfile4 extensions remains one of the most disruptive ransomware threats in 2025. With no free decryptor available, organizations must rely on backups, forensic file recovery, or professional decryptors.
Paying attackers is risky and discouraged. Instead, victims should consider secure recovery solutions, such as our engineered decryptor, which provides verified and tested restoration of encrypted files.
MedusaLocker Ransomware Versions We Decrypt
