How to Decrypt Filecoder Ransomware (.encrypt) Files?

Recover Your Files Immediately with Our Filecoder NAS Ransomware Decryptor

If your organization’s NAS (Network-Attached Storage) device has been encrypted by ransomware and all your files now have the “.encrypt” extension, you’re likely dealing with a variant of Filecoder ransomware targeting Linux-based systems.

Our ransomware recovery engineers have developed a powerful NAS-focused decryptor that can reverse this attack safely—without paying cybercriminals.

Our decryptor targets ransomware infections characterized by:

• File extensions changed to .encrypt
• Ransom notes named README_FOR_DECRYPT.txtt
• Encrypted files beginning with Salted__ headers (indicative of OpenSSL AES encryption)
• Infections that are limited to Synology or QNAP NAS systems, not Windows PCs

We offer a non-invasive, AI-powered, and human-verified decryption service, built for cases exactly like this.

Related article: How to Remove ChickenKiller Ransomware (.locked) and Restore Your Data?

How Our Filecoder NAS Ransomware Decryptor Works?

1. Reverse-Engineered Utility

Our decryptor is designed after analyzing samples of this Filecoder variant. It works by interpreting OpenSSL’s salted AES encryption structure and rebuilding decryption routines from metadata found in your encrypted files.

2. Secure Cloud-Based Decryption

We run the decryptor in a secure, sandboxed cloud environment—keeping your original systems untouched and ensuring full file integrity throughout the process.

3. Pre-Verification Protocol

Before recovery begins, we:

• Analyze 2–3 encrypted files + ransom note
• Confirm encryption patterns and headers
• Validate if your variant matches decryptable families

Only once confirmed, we begin structured recovery.

Also read: How to Decrypt Sysdoz Ransomware (.sysdoz) Files Safely?

Step-by-Step Filecoder Decryption & Recovery Guide

Step 1: Assess the Infection
Check for:

• .encrypt file extensions
• Ransom note titled README_FOR_DECRYPT.txtt
• Files starting with Salted__ (OpenSSL-encrypted format)

Step 2: Secure Your NAS Environment
Immediately disconnect the NAS device from the internet. Block remote services (SMB, NFS, SSH) and disable external port access.

Step 3: Submit Files for Review
Email or securely upload:

• A sample encrypted file
• The ransom note
• (Optional) The original unencrypted version of the file (for comparison)

Step 4: Launch Our Decryptor
Once compatibility is confirmed, our decryptor is deployed remotely or in a sandboxed virtual container.

Step 5: Enter Victim ID
The ransom note usually contains a unique identifier. This is used to reconstruct or select the correct decryption profile.

Step 6: Let the Tool Restore Your Files
Files are decrypted in batches, verified, and returned to their original format with structural integrity and logging.

Also read: How to Decrypt .wrx File Extension After Hit.wrx Attack?

What Should I Do If I’ve Been Infected?

• Immediately disconnect the NAS device from the internet
• Avoid rebooting the device or reinitializing it—this may corrupt encryption metadata
• Do not use unverified decryptors or online “recovery tools”
• Preserve the ransom note and a few encrypted files
• Contact ransomware professionals before making any changes

Keep Calm – Our Expert Team is Ready to Help

Our ransomware response team is available 24/7 and specializes in:

• NAS-targeted ransomware (eCh0raix, DeadBolt, Filecoder)
• OpenSSL-based encryption recovery
• Linux file systems, volume recovery, and corrupted backups
• Lawful, private, and transparent operations

You’ll be supported by:

• Cryptographic engineers
• Linux/NAS recovery specialists
• Incident response coordinators

We ensure:

• No ransom payments
• Full confidentiality
• Recovery timeline of 12–48 hours (in most cases)

Filecoder (.encrypt) Ransomware Statistics & Facts

• First Reported: Late 2024
• Victim Devices: Synology, QNAP, Linux-based NAS only
• File Extension: .encrypt
• Ransom Note: README_FOR_DECRYPT.txtt
• Encryption Scheme: OpenSSL AES with Salted__ header
• McAfee Detection: Linux/Filecoder.a
• Infection Vector: Exposed SSH, admin portals, weak credentials
• Public Decryptors: None available
• Attack Spread: Does not affect Windows; NAS-only targeting
• Common Folder Targets: /homes, /photo, /data, /Public, /Multimedia

What is Filecoder (.encrypt) NAS Ransomware?

The Filecoder NAS ransomware variant is a Linux-compatible cryptovirus that specifically targets NAS devices. It encrypts files using OpenSSL AES encryption, appending the .encrypt extension to each file and rendering them inaccessible.

This ransomware is:

• A likely fork or evolution of eCh0raix/QNAPCrypt
• Deployed in a non-automated, focused attack campaign
• Not a RaaS (Ransomware-as-a-Service) — behavior is manual and targeted
• Often non-destructive — file names and structure are retained

It spreads via:

• Internet-exposed admin panels
• Poorly secured SSH ports
• Credential stuffing from previously leaked logins

Indicators of Compromise (IOCs)

File-Based IOCs

• .encrypt file extension
• README_FOR_DECRYPT.txtt ransom note
• Encrypted files beginning with Salted__

Network-Based IOCs

• Outbound TOR traffic to payment URLs
• Access from foreign IPs to NAS admin or SSH ports

Behavioral IOCs

• NAS-only encryption (Windows unaffected)
• Backups and snapshots often deleted
• Not all files are encrypted — partial encryption in some folders

Key Features & Modus Operandi

• Target System: Synology, QNAP, Linux NAS
• Execution: Script-based payload runs once, encrypts data, deletes backups
• Encryption Method: OpenSSL AES with static salt marker
• Data Theft: Not observed — encryption-only operation
• Ransom Note: Offers test file decryption, provides TOR site for payment
• Persistence: None — no scheduled tasks, daemons, or services remain

Preventive Measures Against Filecoder

• Disable public access to NAS admin interfaces
• Change default NAS passwords; use strong, unique credentials
• Enable two-factor authentication (2FA)
• Update NAS firmware and apps regularly
• Disable unnecessary services: SSH, Telnet, WebDAV
• Perform regular offline backups or replicate to immutable storage
• Use geofencing to restrict access by IP country

Recovery from Filecoder NAS Ransomware Attack

Do:

• Save ransom note and encrypted files
• Take screenshots of the folder structure (optional)
• Contact a professional recovery service

Don’t:

• Delete or move encrypted files
• Reboot or factory reset the NAS
• Pay the ransom — even for test files
• Use decryptors not verified by malware researchers

Ransom Note Behavior & Full Example

Ransom notes named README_FOR_DECRYPT.txtt typically contain:

• Instructions for accessing a .onion site via Tor
• Unique victim ID
• Directions for uploading 2–3 files for “test decryption”
• Warnings not to use recovery tools
• Bitcoin address or QR code for payment

Text snippet:

“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.”

There is no mention of data being exfiltrated — only encrypted.

Filecoder (.encrypt) Ransomware: Platform-Specific Attack Analysis

The Filecoder (.encrypt) ransomware targets Linux-based NAS systems, with confirmed attacks on Synology DSM, QNAP QTS, and other networked Linux file servers. Each platform exhibits specific vulnerabilities and behaviors when compromised.

Below is a comprehensive breakdown of how the ransomware behaves per system type:

Synology NAS (DSM Operating System)

Primary Target Vector:
Synology devices exposed to the internet via misconfigured DSM (DiskStation Manager) web panels or SSH services. Many victims used default admin credentials or had outdated firmware with known CVEs.

Observed Behavior:

• Folders commonly encrypted: /photo, /homes, /music, /web, /data
• Snapshot deletion: Snapshots are removed via the Synology CLI (Command Line Interface) using synosnap or similar shell commands
• Persistence method: None; attack runs once and exits
• Log tampering: In some cases, logs in /var/log/ are wiped to reduce forensic recovery

Known Weaknesses Exploited:

• Outdated DSM versions (e.g., pre-6.x)
• Public access to port 5000/5001
• SSH with default credentials (admin/admin, root)

QNAP NAS (QTS Operating System)

Primary Entry Point:
Attackers exploit publicly exposed QTS cloud login panels or misconfigured MyQNAPCloud settings. Credential reuse from past breaches is also common.

Behavioral Similarities:

• Nearly identical in delivery and encryption behavior to eCh0raix ransomware
• Known to infect systems running outdated versions of QTS 4.x or older

Encryption Targets:

• /Public, /Multimedia, /Download, /Recordings directories
• Encrypted files typically retain filenames but are rendered unusable
• Snapshot services like HBS (Hybrid Backup Sync) are sometimes force-disabled

Post-Infection Behavior:

• Ransom note (README_FOR_DECRYPT.txtt) is placed recursively
• Network shares are often locked mid-session
• File services may auto-restart, causing confusion during analysis

Generic Linux NAS & White-Label Systems

Attack Context:
Devices running custom Linux distributions (e.g., OpenMediaVault, TrueNAS Core) or white-labeled OEM systems may also be impacted—especially if they expose SMB or SSH to the public.

Attack Mechanics:

• Ransomware deployed via SSH brute-force or cron-based injection
• Common use of shell scripts for recursive encryption
• Files may start with Salted__ headers (OpenSSL), but filenames may remain unchanged

Observed Limitations:

• In some instances, encryption is incomplete or buggy, leading to partial damage
• Lower-quality malware strains fail to re-encrypt already-accessed folders

Windows Systems (Clients or Admin Machines)

Important Clarification:
Filecoder does not directly infect Windows systems. It is built for Linux-only execution, and Windows clients are impacted only if they:

• Access the NAS via mapped drives
• Sync data to/from the NAS during the attack

Secondary Impact:

• Files on mapped NAS folders can be encrypted, but the Windows OS itself remains unaffected
• Ransom note visibility depends on folder access permissions

Summary of Technical Characteristics by Platform

Conclusion: Regain Control Without Paying a Ransom

The Filecoder NAS ransomware threat is real — but it’s not unbeatable. If you act quickly, preserve the right data, and partner with experts, you can recover fully without paying criminals or risking your systems.

Our decryptor, recovery team, and secure workflow are designed specifically for Synology, QNAP, and Linux NAS attacks like this.

Frequently Asked Questions

Contact Us To Purchase The Filecoder Decryptor Tool