eCh0raix Ransomware Decryptor
The eCh0raix ransomware, also recognized as QNAPCrypt, is a Linux-based cryptographic malware engineered to compromise QNAP and Synology NAS devices. Since it first surfaced in 2019, it has evolved into a recurring global menace. The ransomware infiltrates systems through brute-force attacks on weak credentials and exploits unpatched vulnerabilities in NAS software, resulting in thousands of encrypted storage systems worldwide.
When active, the malware scrambles vital files and attaches the “.encrypt” suffix, rendering them inaccessible. Victims are then prompted to pay ransom via Tor-based portals in exchange for decryption keys.
Immediate Response After an eCh0raix Attack
Quick isolation and preservation of evidence are key to successful data recovery.
Disconnect the NAS device from the network instantly to halt the spread of encryption to other systems.
Do not modify, reboot, or format the compromised storage device. Keep all ransom notes, logs, and encrypted files untouched, as they provide essential clues for recovery.
Once containment is ensured, reach out to professional ransomware response teams to confirm the variant and plan an appropriate decryption strategy.
Free Data Restoration Techniques
Public Decryptor Utilities
The first generation of eCh0raix (released in 2019) contained weaknesses in its encryption algorithm. Researchers developed open-source decryptors, such as the vricosti eCh0raix Decryptor (available on GitHub), capable of unlocking files from those legacy infections.
However, modern versions (2020 onwards) have closed these loopholes, rendering older tools ineffective for most current incidents.
Backup-Based Recovery
Restoring from offline or immutable backups remains the safest approach to regain access to your data. Before restoration, ensure the backup set has not been encrypted by validating its integrity with checksums or hash comparison tools.
For QNAP or Synology systems, built-in tools like Hybrid Backup Sync (HBS3) or snapshot managers may still hold unencrypted copies of critical files.
Snapshot Versioning
NAS systems often keep automated system snapshots. Reverting to a clean snapshot created before infection can reverse the encryption. Always perform snapshot recovery on an isolated system and verify that the snapshots are intact before proceeding.
Paid Recovery Avenues
Ransom Payment (Not Recommended)
Although paying the ransom is sometimes perceived as the fastest route to recovery, it is rarely safe or reliable. There is no assurance that the attackers will deliver a functioning decryptor, and some victims have received corrupt or incomplete tools.
Additionally, ransom transactions may violate data protection or financial laws depending on jurisdiction.
Negotiation via Intermediaries
Professional negotiators sometimes act as middlemen between victims and ransomware groups. They manage communication through Tor portals, verify decryptor authenticity by requesting sample file restoration, and attempt to negotiate reduced ransom demands.
While occasionally effective, this process can be both time-consuming and costly.
Our Professional eCh0raix (.encrypt) Decryptor
For modern variants, our proprietary eCh0raix decryptor offers a reliable, safe, and verifiable solution. Built through extensive reverse engineering and cryptographic analysis, it enables controlled recovery for QNAP and Synology NAS devices.
How It Works:
- Victim ID Identification: Matches each victim’s ransom note ID with the associated encryption batch.
- AI-Based Key Analysis: Uses machine learning and blockchain verification to ensure authenticity of key mapping.
- Cloud-Secured Decryption: Conducted in an isolated cloud sandbox to prevent reinfection and ensure data integrity.
- Offline Support: Designed for air-gapped and high-security infrastructures.
System Requirements:
- Original ransom note (README_FOR_DECRYPT.txt)
- Encrypted files for sample testing
- Internet access or secure offline execution environment
- Administrative privileges on the affected NAS
Our decryptor supports all major Linux NAS systems and ensures accurate file restoration without funding threat actors.
Step-by-Step Use of Our eCh0raix Decryptor
Verify that your files end with the “.encrypt” extension and that a ransom note named “README_FOR_DECRYPT.txt” (or occasionally “.txtt”) is present in affected folders.
Disconnect the NAS device from all network access immediately. Disable cloud synchronization or remote file sharing to contain the attack.
Send a copy of your ransom note and several encrypted file samples to our experts.
They will analyze the infection, confirm the ransomware variant, and assess compatibility with our decryptor.
Run the decryptor on a clean, uncompromised machine with administrator rights.
Make sure your ransom note and encrypted files are available and that a stable network connection exists for key synchronization.
Each ransom note contains a unique victim ID. Enter this ID when prompted to allow precise key identification and decryption mapping.
Start the decryption procedure. The tool will scan all encrypted files, perform read-only verification, and then decrypt them securely.
Our solution ensures no original file is overwritten until its decrypted counterpart is validated.
After decryption, confirm that all files are fully recovered.
We provide comprehensive audit logs for transparency and post-recovery verification.
The eCh0raix Encryption Architecture
eCh0raix employs a hybrid cryptographic model. It utilizes AES encryption (in Cipher Feedback mode) for file contents and then RSA to secure the AES key. Each victim receives a dedicated RSA key pair fetched from the attacker’s C2 server, making unauthorized decryption nearly impossible.
The malware is developed in Go (Golang), providing platform flexibility and fast performance — ideal for embedded NAS environments that operate on lightweight Linux kernels.
Ransom Note: Structure and Delivery
After completing encryption, eCh0raix leaves behind a ransom note titled “README_FOR_DECRYPT.txt” or occasionally “README_FOR_DECRYPT.txtt” (a misspelled variant).
The message typically reads:
All your data has been locked(crypted).
How to unclock(decrypt) instruction located in this TOR website:
http://sg3dwqfpnr4sl5hh.onion/order/[VictimID]
Use TOR browser for access .onion websites.
Do NOT remove this file and NOT remove last line in this file!
Victims are guided to visit a specific Tor site to begin payment and decryption negotiations.
Infection Process and Propagation
The ransomware infiltrates via several routes:
- Exploiting weak credentials or default passwords
- Leveraging unpatched vulnerabilities such as CVE-2021-28799 in QNAP’s Hybrid Backup Sync (HBS3)
- Attacking outdated Photo Station modules on older firmware builds
After gaining entry, eCh0raix scans mounted drives, encrypts accessible data, and plants ransom notes throughout directories.
Post-Infection Behavior
Upon execution, the ransomware typically:
- Adds a new administrator-level account on the NAS
- Encrypts files while leaving essential system files untouched
- Deletes shadow copies and halts certain services
- Contacts its command server to report infection details and receive unique encryption parameters
Indicators of Compromise (IOCs)
File-Based Clues:
Files appended with the “.encrypt” extension and ransom notes titled README_FOR_DECRYPT.txt or README_FOR_DECRYPT.txtt
Network Clues:
Outbound connections to Tor nodes, including
- sg3dwqfpnr4sl5hh.onion
- 7zvu7njrx7q734kvk435ntuf37gfll2pu46fmrfoweczwpk2rhp444yd.onion
Unique Bitcoin wallets generated per victim are also typical.
System Clues:
Unexpected new admin accounts, sudden CPU spikes during encryption, and a series of failed login attempts before infection.
Tactics, Techniques, and Procedures (TTPs)
eCh0raix’s operations align with the MITRE ATT&CK framework:
- T1078 – Valid Accounts: Stolen or brute-forced NAS credentials
- T1190 – Exploit Public-Facing Applications: Abuse of known NAS vulnerabilities
- T1486 – Data Encrypted for Impact: File encryption across shares and volumes
- T1105 – Ingress Tool Transfer: Deployment of ransomware payloads
- T1136 – Create Account: Persistent admin user creation
- T1102 – Web Service (Tor): C2 and ransom communication channels
Attack Tools and Supporting Utilities
The eCh0raix group favors a compact but effective toolkit designed for stealth:
- Custom Golang binary: The main encryption engine (ELF format)
- SOCKS5 and Tor proxies: For anonymous network traffic
- Credential brute-force tools: To exploit weak NAS authentication
- Exploit frameworks: To automate exploitation of CVE-2021-28799 and similar flaws
Global Impact and Victim Analytics
Countries Most Affected by eCh0raix
Organizations Hit by eCh0raix
eCh0raix Attack Timeline
Conclusion
eCh0raix (.encrypt) ransomware continues to endanger NAS infrastructures globally. However, with timely action and expert intervention, recovery is entirely possible.
Legacy decryptors may resolve older infections, while our advanced decryptor remains the most dependable method for modern variants.
Stay calm, isolate your systems, and depend on verified cybersecurity professionals to bring your data back safely.
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