Filecoder (.encrypt) NAS Ransomware Decryptor

Bydecryptor

If your NAS system has been attacked and your files now end in “.encrypt”, you’re likely facing the Filecoder ransomware — a Linux-targeting cryptovirus affecting storage platforms like Synology, QNAP, and other NAS devices.

Our team has developed a specialized Filecoder NAS Decryptor. It works on ransomware variants that:

  • Rename files with the .encrypt extension
  • Leave ransom notes named README_FOR_DECRYPT.txtt
  • Encrypt files using OpenSSL AES (recognized by Salted__ headers)
  • Impact Linux-based NAS systems only — not Windows PCs

We deliver safe, professional ransomware recovery without paying the attackers.

Affected By Ransomware?
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How Our Filecoder NAS Ransomware Decryptor Works

Our decryptor was built after deep analysis of Filecoder variants in the wild. It reconstructs the encryption method used by the malware and enables file restoration through a secure, sandboxed environment.

Here’s how our process works:

  • Reverse Engineering: Our team studied encryption routines using OpenSSL and created a recovery utility that mimics decryption.
  • Cloud-Based Decryption: All operations are handled remotely inside a secure, isolated cloud sandbox.
  • Pre-Recovery Validation: We analyze your encrypted files and ransom note to confirm compatibility with our decryptor. Only then do we proceed.

This ensures precision recovery with zero risk to your original infrastructure.

Filecoder Decryption & Recovery: Step-by-Step

Step 1: Identify the Infection
 Check for:

  • Files ending with .encrypt
  • Presence of the README_FOR_DECRYPT.txtt ransom note
  • File headers beginning with Salted__

Step 2: Secure Your Environment
 Disconnect the NAS device from all networks and disable services like SMB, NFS, and SSH. Do not reboot or reset the system.

Step 3: Send Samples
 Submit:

  • 1–3 encrypted files
  • The ransom note
  • (Optional) A matching original version of one encrypted file

Step 4: Confirm Decryptor Compatibility
 We verify encryption patterns, analyze file headers, and confirm if your case is supported.

Step 5: Launch Decryption Process
 Once verified, our decryptor is deployed securely, either remotely or in a cloud-based sandbox.

Step 6: Recover Your Data
 Files are restored in batches, verified for integrity, and returned safely.

What to Do Immediately After Infection

  • Unplug the NAS from the internet
  • Avoid rebooting or performing a factory reset
  • Do not use random decryptors
  • Save ransom notes and encrypted file samples
  • Contact a ransomware recovery expert immediately
Affected By Ransomware?
Get Help Now Send Us Email

Keep Calm – Our Expert Team Has You Covered

We specialize in ransomware targeting NAS devices. Our services are used by organizations around the world facing encryption threats on:

  • Synology (DSM), QNAP (QTS), and other Linux NAS
  • eCh0raix, DeadBolt, QNAPCrypt, and Filecoder infections

Our team includes:

  • Certified cryptographic analysts
  • Linux system recovery specialists
  • Data forensics and ransomware containment experts

We guarantee:

  • Transparent communication
  • Recovery within 12–48 hours (typical cases)
  • No upfront payment if we can’t confirm recovery

Filecoder (.encrypt) Ransomware: Key Facts & Insights

  • First Detected: Late 2024
  • Target Systems: Linux-based NAS (Synology, QNAP)
  • File Extension Used: .encrypt
  • Ransom Note Name: README_FOR_DECRYPT.txtt
  • Encryption Method: OpenSSL AES, Salted__ header
  • AV Detection Name: Linux/Filecoder.a
  • Infection Method: Exposed SSH ports, weak admin credentials
  • Data Exfiltration: None confirmed
  • Public Decryptor: Not available as of 2025

What is Filecoder NAS Ransomware?

Filecoder (.encrypt) is a ransomware strain designed to target NAS environments using Linux-based operating systems. It encrypts data with AES algorithms through OpenSSL and leaves behind ransom notes asking for Bitcoin payments.

This strain is:

  • Likely a fork of eCh0raix/QNAPCrypt
  • Script-driven with no advanced payloads or lateral movement
  • Focused on encrypting, not stealing, data

Infections are typically isolated to NAS volumes. Windows machines connected via mapped drives are not infected, but files may be encrypted indirectly.

Affected By Ransomware?
Get Help Now Send Us Email

Indicators of Compromise (IOCs)

File-Based IOCs

  • .encrypt file extensions
  • README_FOR_DECRYPT.txtt notes in each folder
  • Files starting with Salted__ header (OpenSSL)

Network-Based IOCs

  • TOR communication attempts logged in firewall
  • Unusual SSH activity from international IPs

Behavioral IOCs

  • Snapshots or backups deleted
  • Incomplete encryption in some directories
  • Logs in /var/log/ cleared or missing

Modus Operandi: How Filecoder Works

The attack begins by accessing vulnerable NAS devices via exposed SSH or misconfigured web panels. Once inside:

  • The malware runs an encryption script using OpenSSL
  • Files are renamed with .encrypt and overwritten in-place
  • Snapshots and system logs may be deleted
  • A ransom note is dropped instructing victims to pay in Bitcoin via a TOR portal

The ransomware does not leave persistence or attempt to move laterally. It performs a one-time lock and exits.

Preventive Measures for Filecoder Attacks

To reduce the risk of infection:

  • Disable public access to NAS admin panels
  • Enforce strong passwords and enable 2FA
  • Update firmware and DSM/QTS software regularly
  • Limit access to SSH and use port whitelisting
  • Use immutable or offsite backups
  • Monitor NAS logs for failed login attempts or odd IP activity

Recovery Checklist for Victims

What to Do:

  • Keep encrypted files and ransom notes unchanged
  • Save a copy of the NAS system logs if accessible
  • Contact an expert team before taking recovery steps

What to Avoid:

  • Do not reformat or reset your NAS
  • Don’t rely on online decryptors or free tools
  • Avoid paying the ransom — results are not guaranteed

The Filecoder Ransom Note – What It Contains

Ransom notes left by Filecoder are usually titled README_FOR_DECRYPT.txtt. They are straightforward and unbranded. Key contents include:

  • A TOR website address
  • Unique victim ID
  • Instructions to upload 2–3 test files
  • A Bitcoin address or payment page

Ransom note excerpt:

“Your files are encrypted. Do not try to restore them. You can upload 3 files for free decryption. Visit our portal to get the key.”

Affected By Ransomware?
Get Help Now Send Us Email

Filecoder Attacks by Platform

Synology DSM (DiskStation Manager)

  • Entry via outdated DSM panels or exposed port 5000/5001
  • Encryption targets: /photo, /homes, /web, /data
  • Snapshot deletion via command line

QNAP QTS

  • Attacks launched through misconfigured MyQNAPCloud
  • Affected folders: /Public, /Multimedia, /Download
  • Behavior mirrors eCh0raix, including recursive note dropping

Generic Linux NAS (e.g., OpenMediaVault, TrueNAS)

  • Deployed via brute-force SSH or shell scripts injected via cron
  • Encryption may be inconsistent or partial

Windows Clients

  • Not directly infected
  • Files may be encrypted if stored on mapped NAS shares

Conclusion

If your NAS has been locked by Filecoder ransomware, don’t panic — and don’t pay. We offer an effective, tested, and legally compliant way to recover your encrypted data without interacting with attackers.

With our purpose-built decryptor, technical expertise, and fast response model, we help businesses and individuals restore operations with minimal disruption.

Frequently Asked Questions

Yes, in many cases — but it depends on the specific variant.

Our team has successfully recovered data from multiple confirmed Filecoder infections, particularly those using OpenSSL AES encryption with identifiable Salted__ headers. However, Filecoder is not a single uniform strain. It’s often modified, meaning one version may be recoverable, while another may be too corrupted or too recently altered to match any known decryption logic.

That’s why we offer initial sample analysis before any recovery is attempted. You send us 2–3 encrypted files and the ransom note. We inspect the encryption behavior, metadata, and structural patterns. If we confirm compatibility, our decryptor can safely restore the data without risk of corruption.

If your files match known profiles — which many Filecoder victims do — we proceed with full decryption in a secure sandbox environment.

Yes, via offline backups or expert-led decryptor services.

We strongly advise against it.

Paying a ransom does not guarantee decryption. Many ransomware operators either:

  • Fail to deliver a working decryption key,
  • Vanish after payment,
  • Or provide a tool that only partially restores data, causing irreversible corruption.

Additionally, paying a ransom may:

  • Put your organization on a “known payer” list,
  • Expose you to compliance or regulatory violations,
  • Or indirectly fund criminal operations under global sanctions.

Instead, we offer a safe, legal, and proven alternative. If our decryptor confirms viability through analysis, you’ll regain access to your files without ever engaging the attacker.

If you’ve already rebooted your NAS system, don’t panic — but stop using it immediately.
Rebooting can interrupt encryption metadata in volatile memory or remove log traces, making recovery harder. However, it does not always destroy decryption viability. As long as:
The encrypted files remain untouched,

The ransomware note is still accessible,

And the NAS hasn’t been wiped or factory-reset,

— we can often still recover the data. If the system was reinitialized or reset to factory settings, recovery chances drop, but not always to zero.
Preserve whatever data remains. Do not attempt further troubleshooting. Contact us immediately and provide as much context and as many original samples as you can.

Law enforcement can assist with reporting and investigation, but not with technical decryption.
Agencies like the FBI, Europol, or CERTs track ransomware cases globally, and your case may help identify threat actor groups or support future prosecutions. However, they typically:
Do not provide decryptors,

Cannot help with recovery timelines,

And will refer you to technical or professional services for actual file restoration.

We recommend reporting the incident while simultaneously beginning technic

Yes — absolutely.
Our Filecoder decryptor is:
Sandboxed — it runs in a secure virtual environment, never on your NAS or local systems.

Encrypted and logged — we maintain end-to-end data protection and audit logs.

AI-enhanced — we use custom algorithms to interpret patterns, reconstruct file headers, and detect flawed encryptions.

Human-validated — every step of the recovery is overseen by certified analysts.

We never touch your original systems. You don’t install anything. You retain full control over your data, and all communication is encrypted and confidential.

Here’s what most clients can expect:
Initial response: Within 1 hour of contact

Sample analysis: 1–3 hours depending on file complexity

Recovery launch: Same day if files are compatible

Full decryption timeline: 12–48 hours for standard NAS environments

MedusaLocker Decryptor’s We Provide

MedusaLocker Ransomware Versions We Decrypt

CyberLock

GonzoFortuna

Destroy

Ako

Xciphered

Spider

Root

Root4

DavidHasselhoff

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