How to Decrypt Yurei Ransomware and Recover .Yurei Files?

What is Yurei Ransomware?

Yurei is a dangerous ransomware strain that encrypts files and demands payment for their decryption. Once active, it renames files by appending the “.Yurei” extension. For example, 1.jpg becomes 1.jpg.Yurei. A ransom note named _README_Yurei.txt is also dropped, instructing victims to contact the attackers.

Related article: How to Decrypt H2OWATER Team Ransomware and Recover Encrypted Files?

Impact of the Attack

Yurei ransomware compromises internal networks, removes accessible backups, and steals sensitive business information. Stolen data may include databases, corporate communications, bank statements, and other financial or operational files. Victims are threatened with public leaks if the ransom is not paid.

Also read: How to Unlock .EXTEN Files and Decrypt EXTEN Ransomware?

Ransom Note Overview

The ransom message is addressed to company management:

–== Yurei ==–
Dear Management,

If you are reading this message, it means that:

├─ Your company’s internal infrastructure has been fully or partially compromised.
├─ All your backups — both virtual and physical — and everything we could access have been completely wiped.
└─ Additionally, we have exfiltrated a large amount of your corporate data prior to encryption.

We fully understand the damage caused by locking your internal resources. Now, let’s set emotions aside and try to build a constructive dialogue.

WHAT YOU NEED TO KNOW

├─ Dealing with us will save you a lot — we have no interest in financially destroying you.
├─ We will thoroughly analyze your finances, bank statements, income, savings, and investments, and present a reasonable demand.
├─ If you have active cyber insurance, let us know — we will guide you on how to properly use it.
└─ Dragging out negotiations will only cause the deal to fail.

PAYMENT BENEFITS

├─ Paying us saves time, money, and effort — you can be back on track within approximately 24 hours.
├─ Our decryptor works perfectly on all files and systems — you can request a test decryption at any time.
└─ Attempting recovery on your own may result in permanent file loss or corruption — in such cases, we won’t be able to help.

SECURITY REPORT & EXCLUSIVE INFO

├─ The report and first-hand insights we provide upon agreement are invaluable.
└─ No full network audit will reveal the specific vulnerabilities we exploited to access your data and infrastructure.

WHAT HAPPENED

├─ Your network infrastructure has been compromised.
├─ Critical data has been exfiltrated.
└─ Files have been encrypted.

WHAT YOU SHOULD NOT DO

├─ Do NOT rename, modify, or delete encrypted files.
├─ Do NOT shut down your system or run antivirus software — this may cause irreversible damage.
└─ Do NOT waste time with data recovery companies — they cannot help you.

VALUABLE DATA WE USUALLY STEAL

├─ Databases, legal documents, and personal information
├─ Audit reports, SQL databases
├─ Financial documents: statements, invoices, accounting data
├─ Work files and corporate communications
├─ Any backup solutions
└─ Confidential documents

TO DO LIST (Best Practices)

├─ Contact us as soon as possible via our live chat (only).
├─ Purchase our decryption tool — there is no other way to recover your data.
├─ Avoid third-party negotiators or recovery services.
└─ Do not attempt to use public decryption tools — you risk permanent data loss.

RESPONSIBILITY

├─ Violating the terms of this offer will result in:
│ – Deletion of your decryption keys
│ – Immediate sale or public disclosure of your leaked data
│ – Notification of regulatory agencies, competitors, and clients

—

**CHAT:** Yurei
CHAT: –
Your Ticket ID: –
Blog:-
YueriSupp:-
—

Thank you for your attention.

—

**Important Notes:**

– Renaming, copying, or moving encrypted files may break the cipher and make decryption impossible.
– Using third-party recovery tools can irreversibly damage encrypted files.
– Shutting down or restarting the system may cause boot or recovery errors and further damage the encrypted data.

Immediate Actions for Victims

• Disconnect affected systems from the network immediately.
  
• Preserve encrypted data and ransom notes without renaming or deleting.
  
• Avoid rebooting or running unverified recovery tools, as these can cause permanent data loss.
  
• Engage cybersecurity experts promptly for analysis and recovery support.
  

File Decryption and Recovery Methods

Free Options

1. Backup Restoration
If secure backups exist, restoring from an offline or cloud-stored snapshot is the safest way to recover. Ensure backups are clean and verify integrity before redeployment.

2. System Snapshots
Virtual machine snapshots, if created before the attack, can be used to roll back affected servers. Care must be taken to validate snapshots before applying them.

Paid Solutions

1. Paying the Ransom
Some victims may consider paying the ransom to obtain the decryptor. This carries risks, as there is no guarantee that criminals will provide a working tool or that stolen data will remain private.

2. Third-Party Negotiators
Negotiators may act as intermediaries between victims and attackers, often reducing the ransom demand. While sometimes successful, this method can be expensive and time-consuming.

3. Our Yurei Decryptor
Our team has engineered a specialized decryptor for Yurei ransomware, leveraging cryptographic analysis and AI-powered infrastructure. It requires the ransom note, encrypted files, and administrative access. The decryptor securely analyzes encryption metadata and restores files without risk of corruption. Both online (cloud-integrated) and offline (air-gapped) recovery options are supported.

How Our Decryptor Works?

1. Environment Validation
   
   • Before execution, the decryptor performs a complete system scan to ensure no active ransomware processes are still running. This prevents re-encryption during recovery.
     
   • It checks the OS version, system integrity, and available storage to prepare a safe recovery environment.
     
2. Key Retrieval and Authentication
   
   • The tool connects securely to our licensed server to fetch the unique decryption key associated with the victim’s infection.
     
   • Keys are generated per-case and matched against the victim’s ransom signature, ensuring that the correct decryption algorithm is applied.
     
3. Algorithm Identification
   
   • Since Yurei ransomware uses a combination of symmetric and asymmetric cryptographic techniques, the decryptor first identifies the specific encryption scheme used on the victim’s files.
     
   • This step ensures that the correct mathematical approach is applied, avoiding further file corruption.
     
4. Decryption Process
   
   • The decryptor begins file restoration by reversing the ransomware’s encryption layers.
     
   • It works file by file, maintaining the original structure, file names, and extensions, while removing the malicious “.Yurei” suffix.
     
   • For large volumes of data, the tool runs in a multi-threaded mode, significantly reducing recovery time.
     
5. File Integrity Verification
   
   • After decryption, each restored file is subjected to a checksum verification process to ensure its integrity matches the pre-encryption state.
     
   • Corrupted or partially encrypted files are flagged separately, and the decryptor attempts a secondary recovery pass using backup key fragments.
     
6. Report Generation
   
   • Once the process is complete, the decryptor generates a detailed recovery report, including the number of files restored, skipped, or partially repaired.
     
   • Logs are provided for transparency and can be used for compliance or insurance claims.
     
7. Post-Recovery Safeguards
   
   • Finally, the decryptor provides recommendations for system hardening (e.g., re-enabling security tools, patch updates, and backup strategies).
     
   • This ensures the system remains resilient against repeat infections.

Also read: How to Decrypt .obscura Extension Files Infected by Obscura Ransomware?

How Yurei Works: Inside the Attack

Entry Methods

Yurei commonly spreads through phishing emails, malicious attachments, cracked software, and exploit kits. It can also propagate via local networks and infected USB devices.

Tools, Techniques, and Procedures (TTPs)

Initial Access

Yurei ransomware operators typically gain entry into target environments through well-crafted phishing campaigns. These emails often masquerade as urgent business communications or software updates, tricking recipients into clicking malicious links or opening infected attachments. Another vector includes trojanized software installers, distributed via third-party websites, torrent portals, or cracked software tools. These methods exploit user trust and bypass standard security checks, enabling attackers to plant the initial payload.

Execution

Once inside the network, the ransomware payload is delivered through malicious executables, obfuscated PowerShell or batch scripts, and macro-enabled Office documents. These scripts often execute automatically once the victim enables macros or ignores security warnings. The ransomware then establishes a foothold, extracts system details, and begins the encryption process while evading basic antivirus detection.

Credential Access

To extend control within the victim’s environment, Yurei operators deploy password-stealing trojans or use credential dumping tools. Such tools harvest cached passwords, browser-stored credentials, and system tokens. In some cases, stolen credentials are used to move laterally across the network, gaining access to domain controllers, email servers, or backup systems, thereby amplifying the impact of the attack.

Persistence

Persistence mechanisms ensure the ransomware continues running even after reboots or basic removal attempts. Yurei creates scheduled tasks that relaunch the malicious binaries at startup and manipulates Windows registry keys to embed itself deeply into the system. This guarantees continuous execution until the attack objectives—data exfiltration and encryption—are fully achieved.

Defense Evasion

To minimize detection, Yurei disables or removes endpoint protection tools, modifies Windows Event Logs, and deletes Volume Shadow Copies to prevent easy recovery. Attackers also rely on process injection and obfuscation techniques to blend malicious processes with legitimate system activity, making detection significantly harder for traditional security solutions.

Exfiltration

Prior to encrypting files, the ransomware conducts large-scale data theft. Tools such as RClone, FileZilla, and Ngrok are frequently used to siphon data to attacker-controlled servers. Stolen information typically includes databases, financial records, client details, legal documents, and email archives. This double-extortion tactic allows the attackers to threaten public data leaks if the ransom is not paid, further pressuring victims.

Impact

The final stage involves file encryption using strong cryptographic algorithms (often a mix of symmetric and asymmetric encryption). All accessible files are locked, renamed with the “.Yurei” extension, and rendered unusable without the decryption key. Victims are then presented with a ransom note demanding cryptocurrency payments in exchange for a decryption tool and a promise not to leak the stolen data. This dual threat—data loss and reputational damage—makes Yurei particularly destructive for businesses and organizations.

Indicators of Compromise (IOCs)

• File Extension: .Yurei
  
• Ransom Note: _README_Yurei.txt
  
• Known Detection Names:
  
  • Kaspersky: Trojan-Ransom.Win32.Encoder.aetn
    
  • Microsoft: Trojan:Win32/Wacatac.B!ml
    
  • Symantec: ML.Attribute.HighConfidence
    
  • MaxSecure: Trojan.Malware.300983.susgen
    

Suspicious traffic to anonymous file-sharing platforms or TOR-based communication links should also be treated as compromise indicators.

Best Practices for Prevention

Keeping systems updated, enabling MFA on remote access, isolating backups, and using advanced EDR solutions are essential measures. Regular employee awareness training against phishing attempts further reduces attack risk.

Victim Statistics and Graphs

Yurei has primarily impacted corporate networks across finance, education, healthcare, and manufacturing industries. Based on reports:

• Top Countries Affected:
• Industries Targeted:
  
• Timeline of Attacks (2023–2025):

Conclusion

Yurei ransomware is a severe double-extortion threat that not only encrypts but also steals critical corporate data. While no free decryption solution exists today, recovery is possible through secure backups, snapshot rollbacks, or professional decryptor tools. Organizations must act swiftly, avoid unreliable solutions, and seek expert-led recovery to restore their operations and prevent further data exposure.

Frequently Asked Questions

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