FileCoder.VL is a file-encrypting ransomware variant that locks your documents, photos, databases, and other personal files using strong cryptographic algorithms. Once it completes encryption, victims find their files renamed with an appended extension and discover ransom notes demanding payment in cryptocurrency for a decryption tool. This particular ransomware family has targeted both individual users and small businesses, often arriving through malicious email attachments, exploit kits, or bundled with pirated software.
The VL variant follows the standard ransomware playbook: silent encryption, deletion of shadow copies to prevent system-based recovery, and intimidation tactics in the ransom note. While the operators promise decryption keys upon payment, security researchers and law enforcement universally advise against paying—there's no guarantee the criminals will follow through, and payment funds further criminal operations.
Threat Profile
| Attribute | Details |
|---|---|
| Threat Family | FileCoder (ransomware) |
| Variant Designation | VL |
| Aliases | Ransom:Win32/FileCoder.VL, Trojan-Ransom.Win32.FileCoder, VL Crypto Locker |
| Platform | Windows (XP through 11, primarily targets 7/8/10) |
| Encryption Algorithm | AES-256 or RSA-2048 hybrid (typical for this family) |
| File Extension(s) | Varies by campaign (.vl, .locked, .encrypted, or victim-specific identifiers) |
| Ransom Note Filename | Commonly HOW_TO_DECRYPT.txt, README.txt, or similar variations |
| Distribution Methods | Phishing emails, malicious Office macros, RDP brute-force, exploit kits, software cracks |
| Persistence Mechanism | Registry Run keys, scheduled tasks (may execute on every login) |
| Network Communication | Contacts command-and-control servers for encryption keys, victim registration, Tor-based payment portals |
| Shadow Copy Deletion | Yes—executes vssadmin delete shadows /all /quiet to prevent volume shadow recovery |
| Data Exfiltration | Some variants exfiltrate file samples or system info before encryption; behavior varies |
| Removal Difficulty | Moderate (removing the malware itself is straightforward; recovering files without backups is extremely difficult) |
How It Spreads
FileCoder.VL primarily arrives through social engineering attacks designed to trick users into executing the payload. The most common vector is phishing emails that impersonate legitimate businesses—shipping notifications, invoices, legal documents, or account alerts. These emails contain malicious attachments (often Word documents or ZIP files) or links to compromised websites hosting the ransomware executable. When a victim opens the attachment and enables macros (if it's a document) or runs the executable, the infection begins.
Secondary distribution methods include exploitation of unpatched systems and weak security configurations. Attackers scan the internet for exposed Remote Desktop Protocol (RDP) services with weak passwords, then use brute-force or credential-stuffing attacks to gain access. Once inside, they manually deploy the ransomware. Software piracy sites and peer-to-peer networks also serve as distribution channels—cracked applications or key generators often bundle ransomware payloads that activate after the user runs the supposed crack.
Common infection vectors include:
- Malicious email attachments — Word documents, Excel spreadsheets, or PDF files with embedded macros or exploit code
- Drive-by downloads — Compromised websites that use exploit kits (RIG, Fallout, GandCrab) to install ransomware through browser vulnerabilities
- Remote Desktop compromise — Brute-force attacks against poorly secured RDP services on port 3389
- Trojan droppers — Earlier-stage malware that downloads and executes FileCoder.VL as a secondary payload
- Pirated software bundles — Cracked applications, key generators, and "free" premium software that includes the ransomware installer
- Malvertising — Legitimate websites displaying compromised advertisements that redirect to exploit kit landing pages
What It Does On Your Machine
Upon execution, FileCoder.VL immediately begins reconnaissance to determine which files to encrypt and which system processes might interfere with its operation. It scans all accessible drives—local hard drives, mapped network shares, connected USB devices, and cloud-synced folders—building a list of target file types. The ransomware typically focuses on high-value data: documents (.doc, .docx, .pdf), spreadsheets (.xls, .xlsx), databases (.sql, .mdb), images (.jpg, .png, .psd), archives (.zip, .rar), and other formats that victims cannot easily recreate.
Before encryption begins, the malware establishes persistence and eliminates recovery options. It creates registry entries or scheduled tasks to ensure it survives reboots, though in many cases the encryption completes before the victim even notices something is wrong. The ransomware then executes system commands to delete Windows Volume Shadow Copies—the restore points that would otherwise allow file recovery. By running vssadmin delete shadows /all /quiet and similar commands, it removes the safety net built into Windows. Some variants also disable Windows Defender, kill backup processes, or terminate database services to ensure files are unlocked and accessible for encryption.
The encryption process itself happens quickly—often within minutes for a typical home computer, though large file servers may take hours. FileCoder.VL uses asymmetric encryption (the private key exists only on the attacker's server) or a hybrid approach combining symmetric and asymmetric algorithms. Each file is encrypted with a unique key, making brute-force decryption computationally infeasible. Original files are overwritten and securely deleted, leaving only the encrypted versions with modified filenames. Once encryption completes, the ransomware drops ransom notes in every affected folder and often changes the desktop wallpaper to display payment instructions.
The ransom note typically includes a unique victim ID, instructions to purchase Bitcoin or another cryptocurrency, and a deadline with escalating payment amounts. Some variants threaten permanent file deletion after a certain period, though this is often a psychological tactic rather than an automated process. The note directs victims to a Tor-based payment portal where they can supposedly purchase the decryption tool. Security researchers strongly discourage payment—many victims who pay never receive working decryption keys, and even when they do, the process can be unreliable or incomplete.
Manual Removal — Step by Step
Disconnect from all networks immediately
Unplug your Ethernet cable and disable Wi-Fi to prevent the ransomware from spreading to network shares, mapped drives, or other computers on your network. Ransomware often continues scanning for new targets after initial encryption, and disconnecting stops this lateral movement.
Boot into Safe Mode with Networking
Restart your computer and press F8 (or Shift+F8 on Windows 10/11) during boot to access Advanced Boot Options. Select "Safe Mode with Networking" to load Windows with minimal drivers and services, which prevents most malware from executing while still allowing you to download removal tools.
Identify and terminate malicious processes
Open Task Manager (Ctrl+Shift+Esc) and look for suspicious processes—unfamiliar names, processes running from AppData or Temp folders, or executables with random character strings. Right-click any suspicious process, select "Open file location" to note the path, then end the process. Be cautious not to terminate legitimate Windows processes.
Remove persistence mechanisms
Press Win+R, type "regedit" and navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run and HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run. Delete any entries pointing to suspicious executables in AppData or Temp folders. Also open Task Scheduler (taskschd.msc) and delete any suspicious scheduled tasks created around the infection time.
Delete the ransomware files
Navigate to the file locations you identified in Task Manager and delete the entire folder containing the ransomware executable. Common locations include %APPDATA%\
Run comprehensive anti-malware scans
Download and run Malwarebytes Free (from a clean computer if necessary, transferred via USB) to catch any remaining components. Follow up with a full system scan using your primary antivirus software. These tools often detect ransomware remnants, registry artifacts, and associated trojans that manual removal might miss.
Attempt file recovery (if no backups exist)
Check if any Volume Shadow Copies survived by opening System Properties → System Protection → System Restore. If restore points exist, you may recover some files. For professional recovery attempts, consider bringing the machine to our shop before attempting DIY data recovery tools, which can sometimes overwrite recoverable data if used incorrectly.
Check for and remove any decryptors or payment files
Delete all ransom notes (typically .txt or .html files in every folder) and any alleged "decryptor" tools the ransomware may have dropped. These supposed decryptors are never legitimate and often contain additional malware. Search your drives for common ransom note filenames like "HOW_TO_DECRYPT" or "README_FOR_DECRYPT".
Change all passwords from a clean device
Once you've confirmed the ransomware is removed, change passwords for all critical accounts—email, banking, cloud storage, and any business applications. Do this from a different, known-clean device since keyloggers sometimes accompany ransomware. Enable two-factor authentication where available for added protection.
Reboot normally and verify system stability
Restart your computer normally (not in Safe Mode) and monitor system behavior for several days. Watch for unusual network activity, unexpected CPU usage, or the reappearance of suspicious processes. If everything appears clean for 48-72 hours and your security software shows no detections, the removal was likely successful.
Prevention
- Maintain offline backups using the 3-2-1 rule — Keep three copies of important data on two different media types with one copy stored offline or off-site. External hard drives that you disconnect after backups complete cannot be encrypted by ransomware. Cloud backups with versioning provide an additional layer of protection.
- Enable comprehensive email filtering and security awareness — Configure your email client or service to block executable attachments and treat Office documents from external senders with suspicion. Never enable macros in documents from unknown senders, and verify unexpected attachments by calling the supposed sender using a number you look up independently, not one provided in the email.
- Keep all software current with automatic updates — Enable automatic updates for Windows, all browsers, Java, Adobe products, and other commonly exploited software. Ransomware frequently enters through known vulnerabilities that patches have already addressed. Check monthly that updates are actually installing successfully.
- Secure Remote Desktop Protocol or disable it entirely — If you don't need RDP, turn it off completely in Windows Features. If you require remote access, use a VPN, change RDP from default port 3389, enable Network Level Authentication, implement account lockout policies after failed login attempts, and use strong, unique passwords or certificate-based authentication.
- Deploy and maintain reputable security software — Install commercial-grade antivirus/anti-malware with real-time protection and behavioral detection. Windows Defender is acceptable for home users who practice good security hygiene, but consider premium solutions for business environments. Keep definitions updated and run weekly scans.
- Limit user account privileges — Operate daily activities under a standard user account rather than an administrator account. Ransomware running under limited privileges cannot install itself system-wide or modify certain critical areas. Create separate admin accounts only for software installation and system maintenance.
- Use application whitelisting where practical — For business environments, implement software restriction policies or AppLocker to prevent executables from running in user-writable locations like AppData and Temp folders. This stops most ransomware at the execution stage, before encryption can begin.
- Educate all computer users in your household or business — The majority of ransomware infections begin with human error. Regular training on identifying phishing emails, recognizing suspicious downloads, and understanding why "too good to be true" software cracks pose risks dramatically reduces infection probability. Make security everyone's responsibility, not just IT's.
Bring It In
Ransomware removal is straightforward, but data recovery is complex and time-sensitive. If you've been hit with FileCoder.VL, the decisions you make in the next few hours matter significantly. Our Roswell shop has recovered files for dozens of ransomware victims using shadow copy extraction, forensic recovery techniques, and occasionally legitimate decryption tools released by security researchers. We can assess your situation, determine what recovery options exist, and handle the technical removal while you focus on your business or family.
We're located at 1394 Canton Road in Roswell, open Monday through Friday 10 AM to 6 PM, Saturday 10 AM to 4 PM. Call ahead at (770) 637-1435 and we'll walk you through the immediate steps—don't restart that computer or attempt data recovery software without talking to us first. Bring the infected machine in, and we'll have you back up and running, typically within 24-48 hours depending on the scope of encryption and recovery complexity. Ransomware is fixable; letting it spread or making recovery mistakes compounds the damage.