CyberLock Ransomware Decryptor

A Comprehensive Guide & Decryption using MedusaLocker Decryptor

CyberLock Ransomware was recently found and it belongs to the family of MedusaLocker. It has a .cyberlock extension. Operating under a Ransomware-as-a-Service (RaaS) model, similar to its parent MedusaLocker, it allows its creators to distribute the malware to affiliates in return for a portion of the ransom. This structure has enabled a wide-scale spread, with a significant focus on sectors such as healthcare, which remain highly vulnerable to such attacks.

How Does CyberLock Ransomware Spread?

CyberLock Ransomware is a highly sophisticated malware that utilizes a variety of tactics to infiltrate systems and networks. Here are the primary methods through which CyberLock spreads:

Phishing Emails

One of the most common ways CyberLock Ransomware infiltrates systems is through phishing emails. These deceptive emails often contain malicious attachments or links that, once clicked or opened, trigger the ransomware. Attackers frequently disguise these emails to appear as legitimate communications from trusted sources, making it easier for unsuspecting users to fall victim.

Key Signs of Phishing Emails:

• Suspicious attachments (e.g., .exe, .zip, or .pdf files).
• Links that redirect to malicious websites.
• Poor grammar or messages with a sense of urgency, urging immediate action.

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Exploiting Software Vulnerabilities

CyberLock also spreads by exploiting unpatched vulnerabilities in software. Cybercriminals scan networks for systems running outdated or vulnerable software, including operating systems, web applications, and remote desktop services. Once a vulnerability is exploited, they install the ransomware and can propagate it across the network.

Commonly Exploited Vulnerabilities:

• Remote Desktop Protocol (RDP) weaknesses.
• Unpatched software versions.
• Weak or default administrative passwords.

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Network Propagation

CyberLock is designed with network propagation capabilities, enabling it to rapidly spread across connected devices within the same network. After infecting one machine, it scans for other vulnerable systems, leveraging stolen credentials or security flaws to compromise additional devices.

Techniques for Network Spread:

• Using stolen administrative credentials.
• Exploiting open network shares and improper permissions.
• Utilizing remote access tools to move laterally across the network.

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Drive-by Downloads and Malicious Websites

CyberLock can also infect systems through drive-by downloads. This method involves users unknowingly downloading ransomware from a compromised or malicious website. The malicious code can be hidden in website ads, fake software updates, or injected into legitimate websites through vulnerabilities. Users with outdated browsers or plugins are particularly vulnerable.

Signs of Drive-by Downloads:

• Unexpected software installations after visiting certain websites.
• Redirects to suspicious or unknown pages.
• Pop-up messages urging users to update software such as Flash or Java.

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Compromised Remote Desktop Protocol (RDP)

CyberLock frequently targets Remote Desktop Protocol (RDP) connections to gain access to servers and networks. Attackers look for exposed or vulnerable RDP ports, often left open on corporate networks. Once identified, they use brute force attacks or stolen credentials to access the system and deploy the ransomware.

How RDP Is Compromised:

• Weak or default passwords for remote access accounts.
• Exposed RDP ports accessible via the internet without proper security.
• Brute force or credential stuffing attacks to gain unauthorized access.

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Malware-as-a-Service (MaaS) and Affiliate Programs

CyberLock operates as a Ransomware-as-a-Service (RaaS), meaning it is available for purchase or lease by other cybercriminals on underground forums. Affiliates who acquire the ransomware spread it through various methods such as phishing, exploiting vulnerabilities, or hacking into corporate networks. Proceeds from successful attacks are shared between the affiliates (90%) and the developers (10%).

Affiliate Spreading Methods:

• Automated phishing kits.
• Credential harvesting for network attacks.
• Use of underground marketplaces to purchase exploits and malware.

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How CyberLock Encrypts Files

Encryption Key Generation and Distribution

• Random Key Generation: CyberLock employs a robust random number generator to create unique AES-256 encryption keys for each infected system. This ensures that each victim’s data is individually protected, making it more difficult for attackers to decrypt multiple systems with a single key.
• Key Storage and Transmission: The generated AES-256 key is typically stored within the ransomware executable or in a temporary file on the infected system. It is then encrypted using the RSA-2048 public key and transmitted to the attacker’s command-and-control (C&C) server.

Selective Whitelisting and File Renaming

• Efficiency and Speed: By whitelisting specific file types, CyberLock can optimize its encryption process and avoid wasting resources on files that are likely to be irrelevant or redundant. This can expedite the encryption process and increase the chances of successful data extortion.
• File Renaming and Extension Changes: The ransomware appends a specific file extension (e.g, .CyberLock) to the encrypted files, indicating that they are now locked and inaccessible. This serves as a clear visual indicator to the victim that their data has been compromised.

Volume Shadow Copy Deletion

• Recovery Prevention: By deleting volume shadow copies, CyberLock aims to prevent victims from using traditional data recovery methods such as Windows System Restore. Volume shadow copies are essentially backups of files and folders that are created periodically. By removing these backups, the ransomware makes it more difficult for victims to recover their data without paying the ransom.

Ransom Note and Payment Instructions

• Extortion Demand: The ransom note typically includes a clear demand for payment, often in cryptocurrency such as Bitcoin. The attackers may provide a deadline for payment, threatening to delete or leak the encrypted data if the ransom is not paid on time.
• Payment Methods and Contact Information: The ransom note will also contain instructions on how to make the payment, including the Bitcoin wallet address and any additional information required. The attackers may also provide a contact method for victims to reach out with questions or concerns.

Additional Considerations

• Double Extortion: In some cases, ransomware attackers may engage in “double extortion,” where they threaten to leak sensitive data to the public if the ransom is not paid. This tactic can put additional pressure on victims to comply with the attackers’ demands.
• Anti-Virus and Security Measures: It’s important to note that while CyberLock can be a sophisticated threat, it is not invincible. Strong anti-virus software, regular updates, and best security practices can help protect against ransomware attacks.

CyberLock Ransom Note

Once encryption is complete, CyberLock leaves a ransom note in every directory containing affected files. The note includes instructions on how to pay the ransom, often demanding payment in Bitcoin. The ransom note typically directs victims to contact the attackers through a provided email or via the Tor network for further instructions.

While the ransom amount can vary depending on the size and nature of the organization, the attackers often adjust their demands based on the perceived financial capability of the victim. Failure to pay the ransom within the specified timeframe typically leads to threats of data leaks or permanent deletion of the encrypted data.

Preventing CyberLock Ransomware Attacks

Preventing an attack from CyberLock or any other ransomware requires a multi-layered approach to security. Here are some essential steps:

• Strong Passwords and Multi-Factor Authentication (MFA): Emphasize the importance of using strong, unique passwords for all accounts and enabling MFA wherever possible. This significantly reduces the risk of attackers gaining access through stolen credentials.
• Employee Training: Regularly train employees on recognizing phishing attempts, suspicious emails, and social engineering tactics. Educate them on safe browsing practices and the importance of reporting any suspicious activity.
• Software Updates: Stress the importance of keeping all software (operating systems, applications, firmware) up-to-date with the latest security patches. This helps to address known vulnerabilities that attackers might exploit.
• Network Segmentation: Implement network segmentation to isolate critical systems and data from less secure areas. This can limit the spread of ransomware in case of an attack.
• Air-Gapped Backups: Highlight the importance of having air-gapped backups, meaning backups that are physically disconnected from the main network. This ensures that backups are not accessible to attackers even if they infiltrate the main system.
• Backup Testing: Regularly test backups to ensure they are functional and can be restored successfully in case of an attack.

MedusaLocker Decryptor: The Key to Unlocking Your Files

If your system has fallen victim to CyberLock Ransomware, there is now an effective solution available: the MedusaLocker Decryptor. This sophisticated software tool is specifically designed to decrypt files and servers affected by MedusaLocker as well as its variant  e.g CyberLock in this case.

How the MedusaLocker Decryptor Works

The MedusaLocker Decryptor employs advanced decryption techniques and a connection to specialized online servers to bypass the encryption mechanisms used by the ransomware. Key features of the decryptor include:

• Server-Based Decryption: The decryptor requires an internet connection to access servers capable of calculating the decryption keys. These servers exploit known weaknesses in the ransomware’s encryption algorithms, making decryption possible.
• User-Friendly Interface: Even without advanced technical knowledge, users can easily initiate the decryption process thanks to the tool’s simple, step-by-step interface.
• Safe and Effective: Unlike third-party tools that may risk corrupting your data, the MedusaLocker Decryptor is specifically tailored for CyberLock Ransomware, ensuring safe and accurate decryption.
• Availability: The decryptor is a paid tool, available for purchase by contacting the support team via email or WhatsApp.

Steps to Decrypt Your Files Using the MedusaLocker Decryptor

To decrypt files encrypted by CyberLock, follow these steps:

1. Purchase the Decryptor: Contact us to purchase the MedusaLocker Decryptor.
2. Download and Run the Decryptor: Once purchased, download the software and run it as an administrator on the infected device.
3. Ensure Internet Connectivity: The decryptor requires an active internet connection to communicate with its decryption servers.
4. Enter Your ID: Input the unique ID provided in the ransom note.
5. Start the Decryption: Click “Decrypt Files” to begin the process.

In case of any issues during decryption, remote support via Anydesk or similar tools is available.

How to Identify CyberLock Ransomware

CyberLock Ransomware attacks typically leave behind clear signs that can help you identify the infection. One of the most obvious indicators is the presence of a file named “How_to_recovery.txt” in each folder containing encrypted data. This file serves as a ransom note, providing instructions on how to contact the attackers and recover your files.

Steps to Identify CyberLock Ransomware:

1. Look for the “How_to_recovery.txt” File:
   • This file is a hallmark of ransomware and is usually found in every folder that has been encrypted. It contains crucial details for initiating communication with the attackers.
2. Ensure the File Is Safe to Open:
   • While the file itself is generally safe to open since it has a .txt extension, be cautious. Make sure the extension is indeed “.txt” to avoid opening anything harmful that may harm your system beyond recovery.
3. Beware of Extortion Tactics:
   • Attackers often employ scare tactics, threatening you with severe consequences to pressure you into paying the ransom. They might inflate the ransom amount, sometimes demanding double or even triple the original amount.

What to Do If Your Data Has Been Encrypted by CyberLock Ransomware

1. Disconnect Immediately: Serve your system from the network without delay. This step is crucial to prevent further spread of the ransomware and additional encryption of your data. For detailed guidance, visit our Contact Us page.
2. Avoid Engaging with Attackers: Refrain from communicating with the attackers. They are skilled at manipulating inexperienced negotiators and could further exploit the situation.
3. Report the Incident: Notify the relevant law enforcement authorities about the ransomware attack. This step is important for legal and investigative purposes.
4. Shutdown Affected Machines: Power off the compromised system to halt any ongoing encryption processes by Akira. Leaving the system operational may result in additional data encryption.
5. Seek Professional Assistance: Contact cybersecurity experts immediately for help. Timely intervention can significantly improve your chances of data recovery.

How to Backup Your Data Using Different Methods

Backing up your data is essential to ensure its safety and reliability. Below is a detailed guide on how to perform backups using local, cloud, and air-gapped methods.

Local Backups

Step-by-Step:

Choose a Backup Device:

• External Hard Drive/SSD: Offers high capacity and fast data transfer.
• USB Flash Drive: Ideal for small amounts of data and highly portable.
• Network-Attached Storage (NAS): Best for backing up multiple computers over a shared network.

Connect the Device:

• Plug in the external hard drive or flash drive to your computer’s USB port, or ensure your NAS is connected to the local network.

Select Backup Software:

• Use built-in tools like Windows Backup or macOS Time Machine.
• Third-party options include Acronis True Image and EaseUS Todo Backup.

Configure Backup Settings:

• Choose which files or folders to back up.
• Set an automatic backup schedule (daily, weekly, etc.).

Run the Backup:

• Start the backup process using your selected software and wait for it to complete.

Verify the Backup:

• Ensure the backup’s success by browsing through the backed-up files or using the software’s verification feature.

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Cloud Backups

Step-by-Step:

Select a Cloud Backup Service:

• Popular options include Google Drive, Dropbox, Microsoft OneDrive, or dedicated backup solutions like Backblaze and Carbonite.

Sign Up and Install:

• Create an account with your chosen service, then download and install the associated backup client or app.

Set Up the Backup:

• Use the client to select the files or folders for backup.
• Configure the backup frequency (continuous or scheduled).

Start the Backup:

• Begin the backup process. Ensure you have a stable internet connection since cloud backups require consistent connectivity.

Monitor the Backup:

• Check the dashboard or notifications for progress updates.

Verify the Backup:

• Log into your cloud service account and ensure that your files have been successfully backed up. Some services provide tools to check backup integrity.

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Air-Gapped Backups

Step-by-Step:

Choose an Air-Gapped Backup Medium:

• Use an external hard drive or USB drive that you can disconnect from your computer after backing up the data.

Connect the Medium:

• Plug in the external drive to your computer.

Perform the Backup:

• Select files to back up using your preferred software and complete the process. Ensure that the backup is fully completed.

Disconnect and Store:

• Safely eject the drive and physically disconnect it from your computer.
• Store the drive in a secure, separate location away from your primary workstation to protect against physical threats.

Test the Backup:

• Occasionally reconnect the drive to verify that the backup is intact and can be restored if needed.

Update Regularly:

• Periodically reconnect the drive to update the backup with new or modified files.

CyberLock Ransomware represents a serious threat to individuals and organizations, with its combination of strong encryption, network propagation, and evasion techniques. Prevention through regular system updates, strong security practices, and employee training remains crucial to minimizing the risk of infection. If infected, seek expert help and consider using the MedusaLocker Decryptor for safe and effective file recovery.