How to Decrypt Sinobi Ransomware Files (.SINOBI) and Recover Data Safely?
Introduction
Sinobi ransomware has emerged as a dangerous cyber threat, compromising systems, encrypting vital files, and extorting victims through ransom demands. As ransomware campaigns grow in sophistication, the path to recovery is increasingly complex for businesses and individuals alike.
This comprehensive guide explores the nature of Sinobi ransomware, its behavior, and practical solutions to recover encrypted data without succumbing to ransom demands.
Related article: How to Decrypt .satanlock Files and Remove SatanLock Ransomware?
Sinobi Ransomware Overview
Confirmed Attack: Hana Financial (July 5, 2025)
On July 5, 2025, Sinobi ransomware targeted Hana Financial, marking one of the group’s most high-profile attacks to date. This attack is consistent with Sinobi’s aggressive targeting of financial institutions and enterprise environments, confirming their place among today’s most active ransomware groups.
Also read: How to Decrypt Files Encrypted by Daixin Ransomware (.daixin)?
Encrypted File Extensions Used by Sinobi
While no specific extension was disclosed in official reports, Sinobi shares strong behavioral similarities with REvil/Sodinokibi ransomware. These groups typically include the .SINOBI extension to each encrypted file.
Example:
document.docx.SINOBI
Ransom Note Filename Format
Sinobi is also likely to follow REvil’s naming conventions for ransom notes. Victims typically find a file named in the following format inside each affected folder:
Example:
README.txt
Contents of the ransom note file:
Good afternoon, we are Sinobi Group.
As you can see you have been attacked by us! We offer you to make a deal with us. all you need to do is contact us by following the instructions below.
We are not politically motivated group, we are interested only in money, we always keep our word. You have a possibility to decrypt your files and save your reputation in case we find good solution!
You have to know we do not like procrastination. You have 7 days to come to the chat room and start negotiations.
– 1 Communication Process:
In order to contact with us you need to download Tor Browser.
You can download Tor Browser from this link:
https://www.torproject.org/download
After you joined to chat room you have the opportunity to request several things from us for free:
1. make a test decrypt.
2. get a list of the files stolen from you.
At the end, we should agree on the price for our services. Keep in mind that we got your income/insurance documents.
– 2 Access to the chat room:
To access us please use one of the following links:
1. hxxx://sinobi7yuoppj76qnkwiobwfc2qve2xkv2ckvzyyjblwd7ucpptl62ad.onion/login
***
If Tor is blocked in your country you can use this link: http://chat.sinobi.us.org/login
Your unique ID: 68676f1e88b682********** – use it to register in the chat room.
– 3 Blog:
To access us please use one of the following links:
1: hxxx://sinobi6ftrg27d6g4sjdt65malds6cfptlnjyw52rskakqjda6uvb7yd.onion/leaks
***
If Tor is blocked in your country you can use this link: http://blog.sinobi.us.org/leaks
– 4 Recommendations:
Do not try to recover your files with third-party programs, you will only do harm.
Do not turn off / reboot your computer.
Do not procrastinate.
Screenshot of the ransom note file:
Sinobi Decryptor Tool: Restore Files Without Paying Ransom
Our Sinobi Decryptor is a robust recovery tool engineered to decrypt files encrypted with Sinobi’s random extensions, such as .SINOBI
Key Features
- Targeted Decryption: Designed specifically for Sinobi ransomware patterns.
- Extension-Based Matching: Recognizes encrypted files using the .SINOBI extension.
- Secure Server Interaction: Connects to private, secure servers to retrieve decryption data.
- Broad Compatibility: Supports recovery on Windows Servers, ESXi environments, and NAS storage (e.g., QNAP).
System Compatibility
- Windows desktop and server environments
- VMware ESXi hypervisors
- Network-attached storage (NAS) systems
Step-by-Step Recovery with Sinobi Decryptor Tool
- Purchase Access: Contact us securely via WhatsApp or email to obtain the Decryptor.
- Run as Administrator: Launch the tool with administrative rights.
- Enter Victim ID: Found in the ransom note (e.g., README.txt).
- Start Decryption: Initiate the tool to begin safe file restoration.
Also read: How to Recover Files Affected by .efxs Ransomware Virus?
Advantages of Our Sinobi Decryptor
- Simple UI: Minimal technical knowledge required.
- Data Integrity: No risk of file corruption or deletion.
- Cloud-Backed Efficiency: Uses online decryption servers to reduce system load.
- Satisfaction Guaranteed: Includes a money-back guarantee if decryption fails.
Sinobi Ransomware Chat Portals (TOR-Based)
Victims of Sinobi ransomware are typically directed to a secure chat portal hosted on the TOR network. These portals are referenced in the ransom note and are used for direct communication with the attackers. Victims are required to enter a Victim ID from the ransom note to access the chat interface, where payment instructions, deadlines, and decryption verification take place.
Below are several verified TOR chat server URLs used by Sinobi ransomware:
http://sinobi7yuoppj76qnkwiobwfc2qve2xkv2ckvzyyjblwd7ucpptl62ad.onion/login
http://sinobi57mfegeov2naiufkidlkpze263jtbldokimfjqmk2mye6s4yqd.onion/login
Screenshot of one of the chat servers:
Sinobi on VMware ESXi: Virtual Infrastructure Under Threat
Sinobi ransomware variants have targeted VMware’s ESXi hypervisor, encrypting virtual machines and disrupting entire infrastructures.
Attack Methodology
- Entry: Exploits vulnerabilities in the ESXi hypervisor.
- Encryption: Locks VMs using RSA and AES algorithms.
- Extortion: Demands crypto payment under threat of data loss.
Impact
A successful attack on ESXi can halt business operations, causing extensive downtime and data loss across multiple virtual machines.
Sinobi on Windows Servers
Sinobi also targets Windows-based servers, exploiting known vulnerabilities and encrypting business-critical data.
Key Tactics
- Targets sensitive files and databases.
- Uses strong encryption (RSA/AES).
- Demands crypto payments in exchange for decryption.
Identifying a Sinobi Attack
Early detection is critical to mitigating damage. Look for these signs:
| Indicator | Description |
| File Extensions | Files renamed with .SINOBI |
| Ransom Note | A file named README.txt in each directory |
| System Slowness | Increased CPU and disk activity during encryption |
| Outbound Traffic | Suspicious communication with command-and-control (C2) servers |
Encryption Methods Used
Sinobi is believed to use a hybrid encryption scheme, combining asymmetric RSA with symmetric AES—a tactic inherited from REvil. This combination ensures strong encryption and makes decryption without the correct key extremely difficult.
Free Alternatives to Paid Decryption
Before opting for a commercial decryption solution, consider:
- Check Free Tools: Visit NoMoreRansom.org to look for publicly available decryptors.
- Restore from Backup: If offsite or offline backups exist, restore from a clean snapshot.
- Volume Shadow Copy: Run vssadmin list shadows in CMD to see if restore points exist.
- System Restore: Use restore points to revert your system to a pre-infection state.
- Data Recovery Tools: Tools like Recuva or PhotoRec may recover unencrypted file fragments.
Preventing Future Attacks
A layered security approach reduces the risk of infection:
- Patch Systems Regularly
- Restrict Network Access
- Enforce MFA
- Use Offline Backups
- Monitor Network Traffic
- Train Employees
- Enable EDR/AV Protections
The Ransomware Lifecycle
- Infiltration: Through phishing, RDP, or software vulnerabilities.
- Encryption: Data is locked using cryptographic methods.
- Ransom Note: Victim receives demand with instructions.
- Extortion: Non-payment may result in data exposure.
Consequences of Sinobi Ransomware
- Downtime: Loss of productivity and operational halts.
- Financial Damage: Ransom, remediation, and regulatory fines.
- Data Exposure: Risk of data leaks from non-compliance or extortion.
Conclusion
Sinobi ransomware, notably used in the July 5, 2025 attack on Hana Financial, represents a growing threat in the cyber extortion landscape. With likely use of randomly generated extensions like .SINOBI and ransom notes such as README.txt, this malware mirrors the devastating capabilities of REvil. Tools like the Sinobi Decryptor provide a safe and structured recovery path. Prevention, prompt detection, and secure recovery mechanisms are key to defeating ransomware attacks and minimizing business impact.
Frequently Asked Questions
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