TWI Ransomware Decryption and Removal Using Phobos Decryptor

Introduction

MedusaLocker ransomware has emerged as a formidable threat in the cybersecurity landscape since its discovery in 2019. Known for encrypting victims’ files and appending various extensions, including “.twi,” this ransomware variant demands payment for data decryption. Understanding its operation, distribution methods, and prevention techniques is crucial for individuals and organizations to safeguard their digital assets.

Related article: Midnight Ransomware Decryption and Removal Using Phobos Decryptor

Understanding MedusaLocker Ransomware

MedusaLocker operates as a Ransomware-as-a-Service (RaaS), allowing affiliates to distribute the malware in exchange for a share of the ransom payments. Once it infiltrates a system, it encrypts files using a combination of AES and RSA algorithms, appending extensions like “.twi” to the filenames. The ransomware then drops a ransom note titled “HOW TO DECRYPT THE FILES.txt,” instructing victims on how to pay the ransom to regain access to their data.

Also read: Babuk Ransomware Decryption and Removal Using Phobos Decryptor (2025)

Infection Vectors and Propagation

MedusaLocker employs several tactics to infiltrate systems:

Remote Desktop Protocol (RDP) Exploitation: Attackers exploit weak or compromised RDP credentials to gain unauthorized access.

• Phishing Emails: Malicious emails with infected attachments or links are used to trick users into executing the ransomware.
  
• Exploitation of Vulnerabilities: Unpatched systems and software vulnerabilities are targeted to deploy the ransomware.
  
• Network Propagation: Once inside a network, MedusaLocker uses tools like PowerShell scripts and batch files to spread across connected devices.

Ransom Note Details

The ransom note, “HOW TO DECRYPT THE FILES.txt,” typically contains the following information:

• Notification of Encryption: Informing the victim that their files have been encrypted.
  
• Payment Instructions: Details on how to pay the ransom, usually in Bitcoin, to receive the decryption tool.
  
• Warnings: Threats about data loss or increased ransom amounts if payment is not made within a specified timeframe.
  

It’s important to note that paying the ransom does not guarantee data recovery and may encourage further criminal activity.

Technical Analysis

• Encryption Mechanism: MedusaLocker uses AES encryption for file content and RSA-2048 to encrypt the AES key, making decryption without the private key virtually impossible.
  
• Persistence: The ransomware modifies system registries and creates scheduled tasks to maintain persistence on infected systems.
  
• Defense Evasion: It disables security tools and deletes shadow copies to prevent data recovery.
  
• Safe Mode Execution: MedusaLocker may reboot systems into Safe Mode to bypass certain security measures.
  

Impact on Systems

Victims of MedusaLocker ransomware experience:

• Data Inaccessibility: Encrypted files with extensions like “.twi” become unusable.
  
• Operational Disruption: Critical systems and services may be halted, affecting business continuity.
  
• Financial Loss: Costs associated with downtime, data recovery, and potential ransom payments.
  

Detection and Removal

To detect and remove MedusaLocker:

1. Isolate Infected Systems: Disconnect affected devices from the network to prevent further spread.
   
2. Use Reputable Security Software: Employ updated antivirus and anti-malware tools to scan and remove the ransomware.
   
3. Restore from Backups: If available, restore data from clean backups. Ensure backups are free from infection before restoration.
   
4. Consult Cybersecurity Professionals: Seek expert assistance for thorough system cleaning and data recovery.
   

Prevention Strategies

Implement the following measures to protect against MedusaLocker:

• Regular Updates: Keep operating systems and software up-to-date with the latest security patches.
  
• Strong Authentication: Use complex passwords and enable multi-factor authentication, especially for RDP access.
• Network Segmentation: Divide networks to limit the spread of malware.
  
• User Education: Train employees to recognize phishing attempts and handle emails cautiously.
  
• Regular Backups: Maintain offline backups of critical data and verify their integrity periodically.
  

Recovering Files Encrypted by MedusaLocker Ransomware: Can Our Decryptor Help?

If your system has been compromised by MedusaLocker ransomware, you’re likely facing a critical situation—your files are encrypted with a “.twi” extension, and cybercriminals are demanding a ransom for the decryption tool. Fortunately, there’s a reliable and safe solution: our exclusive Phobos Decryptor offers a powerful and effective method to recover your data without paying the ransom.

Whether your files are located on personal computers, business networks, or NAS devices like QNAP that may have been compromised through shared network credentials or protocol exploitation, the Phobos Decryptor is designed to handle even complex data recovery scenarios.

How Our Phobos Decryptor Can Help You Restore Your Files?

The Phobos Decryptor is specifically engineered to combat infections caused by MedusaLocker ransomware. It delivers a secure, straightforward decryption process that allows you to regain access to your files without involving cybercriminals.

This includes the ability to recover encrypted data from QNAP NAS devices and backup volumes that may have been affected by ransomware exploiting network protocols such as SMB or reused login credentials.

Why Our Phobos Decryptor Is the Ideal Recovery Solution?

• Purpose-Built Decryption for MedusaLocker Ransomware
Our decryptor is tailored to reverse the damage caused by the MedusaLocker strain, particularly those encrypting files with the “.twi” extension.

• User-Friendly and Efficient
The decryption process is streamlined and does not require advanced technical skills.

• Data Integrity Assurance
Unlike many third-party tools that risk data corruption, our decryptor ensures complete data safety throughout the process.

Even in cases where a NAS setup—such as QNAP—has experienced volume-level encryption or partial data corruption, the Phobos Decryptor can often recover accessible encrypted files, provided the underlying hardware is still functional.

Steps to Use Our Phobos Decryptor for Encrypted Files

If your files have been locked by MedusaLocker ransomware, follow these steps to begin the recovery process:

Step 1: Secure Access to the Tool
Reach out to obtain the Phobos Decryptor. Upon purchase, you’ll receive immediate access.

Step 2: Launch with Administrator Privileges
Run the application on your infected system with administrator rights and ensure your internet connection is active.

Step 3: Connect to Decryption Servers
The tool will automatically connect to our secure servers to generate custom decryption keys for your files.

Step 4: Input Your Victim ID
Refer to the ransom note left by MedusaLocker (titled “HOW TO DECRYPT THE FILES.txt”) to find your unique Victim ID, and enter it into the application.

Step 5: Decrypt Your Files
Initiate the decryption process and allow the tool to systematically restore your files without any data loss.

Also read: ARROW Ransomware Decryption and Removal Using Phobos Decryptor

Why Choose the Phobos Decryptor Over Other Recovery Tools?

• Proven Track Record Against MedusaLocker
The Phobos Decryptor has been rigorously tested and has successfully recovered encrypted data in numerous real-world cases.

• Guaranteed File Safety
Your data is processed securely, with no risk of corruption or additional damage.

• Expert Remote Assistance Available
Our team of cybersecurity professionals is on standby to assist you throughout the decryption process if needed.

• No Need to Support Criminal Activity
Avoid the risks associated with ransom payments. With our decryptor, you can restore your files legally and securely.

From standalone systems to enterprise-level networks and QNAP NAS configurations, the Phobos Decryptor is robust enough to support recovery across a wide range of environments—helping to minimize both downtime and financial impact.

Conclusion

MedusaLocker ransomware, particularly its “.twi” extension variant, poses a significant threat to individuals and organizations. Understanding its operation, implementing preventive measures, and responding promptly to infections are crucial steps in mitigating its impact. By staying informed and vigilant, one can effectively defend against such cyber threats.

FAQs

What is the “.twi” extension in MedusaLocker ransomware?

The “.twi” extension is appended to files encrypted by a specific variant of MedusaLocker ransomware, indicating that the file has been compromised.

Can I decrypt my files without paying the ransom?

Decryption without the attacker’s key is extremely difficult due to the strong encryption algorithms used. It’s recommended to consult cybersecurity experts for potential recovery options.

How does MedusaLocker spread within a network?

 MedusaLocker propagates through networks by exploiting RDP vulnerabilities, using malicious scripts, and leveraging shared network resources.

Is it safe to pay the ransom demanded by MedusaLocker?

Paying the ransom is not advised, as it does not guarantee data recovery and supports criminal activities.

How can I protect my organization from MedusaLocker?

Implement robust cybersecurity measures, including regular system updates, strong authentication protocols, employee training, and maintaining secure backups.