Ransomware continues to be one of the most damaging forms of malware for both individual users and organizations. One of the latest variants identified by our researchers is Lucky (MedusaLocker), a ransomware strain that encrypts files using sophisticated cryptographic methods and then demands payment for decryption.
What Is Lucky (MedusaLocker) Ransomware?
Lucky (MedusaLocker) is a ransomware variant that belongs to the MedusaLocker family. Once executed on a victim’s machine, it encrypts data files by appending the extension .lucky777 to each encrypted file (e.g., “1.jpg” becomes “1.jpg.lucky777”). The ransomware uses a combination of RSA and AES algorithms to secure the encryption process, making it nearly impossible to decrypt the files without the corresponding decryption key—unless the malware contains critical flaws, which is rare in modern ransomware.
After completing the encryption process, the ransomware alters the desktop wallpaper and drops a ransom note in an HTML file named READ_NOTE.html. This note not only informs the victim about the encryption but also provides instructions for contacting the cyber criminals and negotiating a ransom payment. The attackers claim to have stolen confidential data from the infected machine and threaten to leak it publicly if their demands are not met within a specified period.
Detailed Threat Overview and Table
Below is a table summarizing the key details of Lucky (MedusaLocker) ransomware:
| Parameter | Details |
|---|---|
| Threat Type | Ransomware, Crypto Virus, File Locker |
| Encrypted File Extension | .lucky777 |
| Ransom Note File Name | READ_NOTE.html |
| Associated Email Addresses | paul_letterman@zohomailcloud.ca, thomas_went@gmx.com |
| Detection Names | Avast (Win64:RansomX-gen [Ransom]), Combo Cleaner (Gen:Variant.Tedy.670488), ESET-NOD32 (Variant Of Win64/Filecoder.MedusaLock), Kaspersky (HEUR:Trojan-Ransom.Win32.Generic), Microsoft (Ransom:Win64/MedusaLocker) |
| Symptoms of Infection | Files become inaccessible, file extensions changed to .lucky777, altered desktop wallpaper, ransom note message appears on screen |
| Damage | All files are encrypted; potential for additional malware such as password-stealing trojans; loss of data unless backups are available |
| Distribution Methods | Infected email attachments (macros), torrent websites, malicious ads |
| Danger Level | High – due to the encryption strength (RSA+AES), data exfiltration, and extortion tactics threatening data leaks and public release |
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The Ransom Message
A critical component of the ransomware’s operation is the ransom note it leaves behind. Below is the full text of the message displayed by Lucky (MedusaLocker):
YOUR PERSONAL ID:
-
Hello dear management,
All your important files have been encrypted!
Your files are safe! Only modified. (RSA+AES)
ANY ATTEMPT TO RESTORE YOUR FILES WITH THIRD-PARTY SOFTWARE
WILL PERMANENTLY CORRUPT IT.
DO NOT MODIFY ENCRYPTED FILES.
DO NOT RENAME ENCRYPTED FILES.
No software available on internet can help you. We are the only ones able to
solve your problem.
From your file storage, we have downloaded a large amount of confidential data of your company and personal data of your clients.
Data leakage will entail great reputational risks for you, we would not like that.
In case you do not contact us, we will initiate an auction for the sale of personal and confidential data.
After the auction is over, we will place the data in public access on our blog.
The link is left at the bottom of the note.
This server will be immediately destroyed after your payment.
If you decide to not pay, we will release your data to public or re-seller.
So you can expect your data to be publicly available in the near future..
We only seek money and our goal is not to damage your reputation or prevent
your business from running.
You will can send us 2-3 non-important files and we will decrypt it for free
to prove we are able to give your files back.
Contact us for price and get decryption software.
email:
paul_letterman@zohomailcloud.ca
thomas_went@gmx.com
* To contact us, create a new free email account on the site: protonmail.com
IF YOU DON'T CONTACT US WITHIN 72 HOURS, PRICE WILL BE HIGHER.This message not only instills fear by emphasizing the irreversible nature of the encryption process but also adds pressure with a tight deadline and escalating ransom demands. The threat of leaking sensitive information adds an extra layer of extortion.
How Lucky (MedusaLocker) Works
Encryption Process
Lucky (MedusaLocker) employs a combination of RSA and AES cryptographic algorithms. RSA, an asymmetric encryption method, is used for securely encrypting the AES keys, while AES, a symmetric encryption algorithm, handles the actual file encryption. This two-layered approach significantly complicates any attempts at decryption without the proper keys.
Impact on Data
Once a system is infected, all accessible files are encrypted. Users may notice that their files now have an additional “.lucky777” extension. The ransomware ensures that any effort to modify, rename, or restore these files using third-party tools will result in permanent corruption, making recovery nearly impossible without the decryption key provided by the attackers.
Data Exfiltration
A unique and alarming aspect of Lucky (MedusaLocker) is the claim that it not only encrypts files but also steals sensitive company and personal data. The ransom note clearly states that confidential data has been downloaded from the victim's file storage, and the attackers threaten to auction or publicly release this information if their demands are not met.
Distribution and Infection Vectors
Cyber criminals spread Lucky (MedusaLocker) through a variety of means:
- Email Attachments: Malicious files or macro-enabled documents are disguised as legitimate attachments.
- Torrent Websites: Infected software or media files are often shared on peer-to-peer networks.
- Malicious Ads: Malvertising campaigns trick users into clicking on infected advertisements.
- Social Engineering: Techniques such as phishing and fake software updates lure users into executing the malicious payload.
Comprehensive Guide to Removing Lucky (MedusaLocker) with SpyHunter
Remove
Lucky (MedusaLocker) Ransomware
With SpyHunter
Download SpyHunter now, and scan your computer for this and other cybersecurity threats for free!
SpyHunter is a well-known anti-malware tool designed to detect and remove various types of malicious software, including ransomware. Although removal tools like SpyHunter cannot decrypt files already encrypted by Lucky (MedusaLocker), they can help eliminate the infection from the system, preventing further damage and stopping additional malware from being installed. Follow these steps to remove Lucky (MedusaLocker) using SpyHunter:
Step 1: Isolate the Infected System
- Disconnect from the Internet: Immediately disconnect the infected computer from any networks. This prevents the ransomware from communicating with its command and control server and stops the potential exfiltration of sensitive data.
- Disable Wi-Fi and Bluetooth: Turn off any wireless connections to minimize the risk of the malware spreading to other devices.
Step 2: Boot into Safe Mode
- Restart Your Computer: Boot the system in Safe Mode with Networking if necessary. Safe Mode limits the number of processes running and prevents many malicious programs from launching.
- Access Safe Mode: On Windows, this can usually be done by pressing F8 (or Shift+Restart) during startup, then selecting "Safe Mode" from the boot options.
Step 3: Download and Install SpyHunter
- Obtain SpyHunter: Download the latest version of the software. Be cautious of third-party download sites to avoid further infections.
- Installation: Run the installer and follow the on-screen instructions to complete the installation. Ensure that SpyHunter is updated to the latest virus definitions before proceeding.
Step 4: Run a Full System Scan
- Initiate the Scan: Open SpyHunter and choose the option to perform a full system scan. This process may take some time, depending on the size of your storage and the number of files.
- Review the Results: After the scan completes, SpyHunter will display a list of detected threats. Look specifically for entries related to Lucky (MedusaLocker) or other associated malware.
Step 5: Quarantine and Remove the Threat
- Quarantine Detected Items: Select the option to quarantine any files or processes identified as malicious. This step isolates the threat from the rest of the system.
- Confirm Removal: Follow the prompts to permanently remove the malware from your computer. SpyHunter may require a system restart to finalize the removal process.
Step 6: Verify System Integrity
- Rescan: After restarting, run another full system scan with SpyHunter to ensure that no remnants of the infection remain.
- Check for Additional Malware: Consider running additional reputable antivirus tools to double-check your system, as ransomware infections can sometimes be accompanied by other types of malware, such as keyloggers or password stealers.
Step 7: Restore Files from Backup
- Assess Damage: Unfortunately, removing the ransomware will not automatically decrypt your files. You must restore your data from a secure, uninfected backup.
- Data Recovery: Ensure that your backups are clean and up-to-date. If you don’t have recent backups, consider using professional data recovery services, although success is not guaranteed.
Preventive Methods to Avoid Future Infections
Prevention is the best defense against ransomware like Lucky (MedusaLocker). Here are several best practices and security measures that individuals and organizations should enforce:
Maintain Regular Backups
- Multiple Backup Locations: Keep backups in various locations, such as external hard drives, cloud storage, and offline media. Ensure backups are disconnected from the network after updates.
- Automated Backup Solutions: Utilize backup software that regularly and automatically saves your data.
Keep Software and Operating Systems Updated
- Patch Management: Regularly update your operating system, antivirus software, and all installed applications to protect against vulnerabilities that malware exploits.
- Automatic Updates: Enable automatic updates where possible to ensure you receive the latest security patches.
Enhance Email and Web Security
- Phishing Awareness: Educate employees and users on recognizing phishing emails and suspicious attachments.
- Email Filtering: Use advanced email filtering solutions to block malicious emails and attachments before they reach your inbox.
- Safe Browsing: Employ web filtering tools to block access to known malicious websites and prevent drive-by downloads.
Use Robust Antivirus and Anti-Malware Software
- Multi-Layered Protection: Install reputable antivirus programs alongside specialized anti-malware tools like SpyHunter.
- Regular Scans: Schedule regular scans to detect and remove potential threats before they can cause harm.
Limit User Privileges
- Least Privilege Principle: Ensure that users have only the minimum level of access necessary for their tasks. This limits the potential damage of an infection.
- Admin Rights: Avoid using administrative accounts for daily activities. Use a standard user account for routine tasks.
Network Segmentation
- Isolate Critical Systems: Segment your network so that if one segment becomes infected, the ransomware cannot easily spread to other critical areas.
- Firewalls and Intrusion Detection: Implement robust firewalls and intrusion detection systems (IDS) to monitor and block suspicious activities.
Security Awareness Training
- Employee Education: Regularly conduct cybersecurity awareness training sessions to keep staff informed about the latest threats and safe online practices.
- Simulated Phishing Exercises: Run simulated phishing campaigns to test and improve your organization’s resilience against social engineering attacks.
Conclusion
Lucky (MedusaLocker) ransomware is a sophisticated and dangerous threat that not only encrypts files with a seemingly unbreakable combination of RSA and AES encryption but also threatens to expose sensitive data if the ransom is not paid. As shown in the detailed overview and table above, this malware poses a significant risk to both individual users and organizations.
While tools like SpyHunter provide a reliable method for removing the infection from your system, they cannot reverse the encryption of your files. Therefore, the importance of preventive measures—regular backups, timely software updates, and robust security practices—cannot be overstated. By following the steps outlined in our comprehensive removal guide and implementing strong cybersecurity practices, you can reduce the risk of falling victim to ransomware attacks in the future.
Remove
Lucky (MedusaLocker) Ransomware
With SpyHunter
Download SpyHunter now, and scan your computer for this and other cybersecurity threats for free!
