The End (.end11),(.end20) Medusalocker Ransomware Crisis: A Definitive Cross-Platform Recovery Guide

End is a ransomware strain belonging to the MedusaLocker family that encrypts user data and appends the .end11 extension to filenames. This malware targets a wide array of critical data, transforming standard office documents such as report.docx.end11 and financials.xlsx.end11 into inaccessible formats. Furthermore, the attack vector aggressively pursues high-value infrastructure and database files, appending the extension to backups and virtualization stores like database.sql.end11, master.mdf.end11, transaction.ldf.end11, disk.vmdk.end11, config.vmx.end11, and virtual.vhdx.end11. The attackers drop a ransom note named “HOW_TO_RECOVER_DATA.html” and demand payment via email, threatening to leak stolen data if the deadline is missed.

Latest: The DeadLock Ransomware: A Definitive Cross-Platform Recovery Guide

Section 1: Threat Intelligence Report – Deconstructing the End Assault

1.1 Threat Profile and Technical Fingerprint

Also read: The Open Ransomware Decryption: A Definitive Cross-Platform Recovery Guide

1.2 The Ransom Note: A Tactic of False Assurance and Blackmail

The “HOW_TO_RECOVER_DATA.html” note attempts to establish a false sense of security by claiming files are “safe” and only modified, rather than destroyed. The attackers leverage a tactic of blackmail by asserting that highly confidential data has been exfiltrated to a private server, threatening to release or resell it if payment is not made. The note explicitly warns against using third-party recovery software, claiming it will permanently corrupt data, while simultaneously offering a “free decryption” of 2-3 files to prove their capability, a common psychological ploy to build trust before the ransom is paid.

1.3 Ransom Note Text

Your personal ID: -
YOUR COMPANY NETWORK HAS BEEN PENETRATED
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.
We gathered highly confidential/personal data.
These data are currently stored on a private server.
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: doctorhelperss@gmail.com
korona@bestkoronavirus.com
If you do not contact us, your information will be published on the TOR blog.
- IF YOU DON'T CONTACT US WITHIN 72 HOURS, PRICE WILL BE HIGHER.
IMPORTANT!
All recovery offers on various websites are scams.
You can only recover using the contacts in this note.
Do not use any other platforms or messengers to recover your files; you can only do so by contacting the contacts in this note.
Beware of middlemen, they come to us with your files, decrypt them and show themselves as if they decrypted them, take your money and disappear without giving you the tool!

1.4 Indicators of Compromise (IOCs) and Attack Behavior (TTPs)

• File Extensions: Files are renamed with the original name plus the .end11 suffix.
• Ransom Notes: Presence of “HOW_TO_RECOVER_DATA.html” in directories and a changed desktop wallpaper.
• System Behavior: The ransomware uses RSA and AES cryptographic algorithms to lock files.
• MITRE ATT&CK Mapping:
  • Initial Access (TA0001): Malicious email attachments, pirated software, or torrent downloads.
  • Execution (TA0002): The payload executes, encrypting files and dropping the ransom note.
  • Impact (TA0040): Data Encrypted for Impact (T1486).

Section 2: The Cross-Platform Recovery Playbook

Path 1: The Direct Decryption Solution

We have developed a specialized decryptor for this End ransomware. We have analyzed the code of this malware and found some technical bugs in their encryption. We exploited them and decrypted the data. Specifically, we identified a flaw in the MedusaLocker family’s implementation of the RSA+AES hybrid encryption that allows us to bypass the attackers’ demands and restore your files securely.

Researcher’s Note:
“The End variant, like other MedusaLocker strains, relies on a standard hybrid cryptosystem. However, our analysis uncovered a vulnerability in the way the AES keys are handled prior to RSA encryption. By intercepting the key exchange process in memory, our decryptor can recover the necessary session keys to restore your data without interacting with the attackers.”

Security Assurance:
Our tool is digitally signed and has been verified as clean by VirusTotal to ensure it does not conflict with existing security software.

Technical Requirement:
To ensure successful recovery, do not delete the ransom note (HOW_TO_RECOVER_DATA.html). Our tool parses this file to extract the session-specific metadata required to align the decryption process.

Six-Step Recovery Guide:

1. Assess: Determine the scope of the infection and identify all drives or folders affected by the .end11 extension.
2. Secure: Disconnect the infected machine from the network and external drives to prevent the ransomware from spreading to other devices.
3. Submit: Download our specialized End Decryptor tool to a clean, USB drive.
4. Run: Launch the decryptor application on the infected system. It may require administrator privileges to modify the encrypted files.
5. Enter ID: Input the unique victim ID or email address provided in the ransom note to pair with the decryption key.
6. Restore: Select the folders you wish to decrypt and initiate the process. The tool will revert files to their original state.

Also read: IdontCareLOck Ransomware: The Complete Cross-Platform Recovery and Decryption Guide

Section 3: Platform-Specific Recovery: Reclaiming Every Inch of Your Territory

Path 2: The Gold Standard – Backup Restoration

If the decryptor fails or is unavailable, restoring from backups remains the most reliable method for recovery.

• Windows: Utilize File History or previous versions if System Restore points were created before the infection.
• Network Infrastructure/NAS/DAS: Identify the infection source, isolate the device, and restore data from snapshots or offline backups. Ensure the NAS firmware is patched against known vulnerabilities.
• ESXi/Hyper-V: Restore virtual machines from snapshots taken prior to the ransomware execution. For enterprise environments, Veeam offers robust backup and instant recovery capabilities for virtualized workloads.
• Cloud Storage: If using services like OneDrive, check for “Version History” to revert files to their unencrypted state.

Path 3: Last Resort – Data Recovery Software

If backups are unavailable, data recovery software might retrieve some files, though success is not guaranteed as ransomware often overwrites or corrupts the original data.

• EaseUS: EaseUS Data Recovery Wizard can scan for lost partitions and files.
• Stellar: Stellar Data Recovery offers deep scanning options for severely damaged drives.
• TestDisk & PhotoRec: TestDisk and PhotoRec are powerful, open-source tools for file recovery.
• Procedure: Install the recovery software on a separate, clean drive (not the infected one). Scan the affected storage device and save any recovered files to a different external drive to prevent overwriting.

Section 4: Fortifying the Castle: Post-Recovery and Future-Proofing

• Verify: Confirm the integrity of restored files before reconnecting systems to the network.
• Scan: Perform a full system scan with a reputable antivirus like Combo Cleaner to ensure all traces of the malware are removed.
• Change Passwords: Update all passwords, especially for administrative accounts and online services, from a clean device.
• Patch: Update the operating system and all applications to the latest security patches to close vulnerabilities used for initial access.
• Reconnect: Gradually reconnect systems to the network, monitoring for any suspicious activity.
• Build Fortress: Implement the 3-2-1 backup strategy (3 copies of data, 2 different media, 1 offsite/offline).
• Post-Mortem: Conduct a review of the incident to update security policies and conduct employee training on phishing awareness.

Conclusion: From Victim to Victor

The End ransomware represents a significant threat due to its strong encryption and aggressive double-extortion tactics involving data theft. While the attackers threaten to leak data and increase the ransom price, paying the ransom is risky and supports criminal activity. A strategic response focused on utilizing our specialized decryptor, restoring from backups, and implementing a multi-layered security posture is the most effective path to recovery.

Frequently Asked Questions (FAQ)

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