FileCoder.Ke ransomware is a file-encrypting threat that targets Windows systems, locking victims out of their personal documents, photos, databases, and other valuable files. Once it encrypts your data, it appends a distinctive extension to filenames and drops a ransom note demanding payment—typically in cryptocurrency—in exchange for a decryption key. This particular variant belongs to a broader family of file-coding malware that has circulated since the mid-2010s, preying on both home users and small businesses who lack adequate backup systems.
Like most ransomware, FileCoder.Ke operates silently in the background until encryption completes, at which point victims discover they can no longer open their files. The attackers then present their demands, often threatening to delete the decryption key after a deadline expires. While paying the ransom might seem like the fastest path to recovery, it offers no guarantee—criminals frequently fail to provide working decryption tools even after payment, and funding these operations only encourages further attacks.
Threat Profile
| Attribute | Details |
|---|---|
| Threat Family | FileCoder / File-encrypting ransomware |
| Variant Name | FileCoder.Ke (also detected as MSIL:FileCoder-Ke by some vendors) |
| Platform | Windows (all modern versions; XP through Windows 11) |
| First Observed | Mid-2010s (specific .Ke variant emerged circa 2016–2017) |
| Distribution Methods | Malicious email attachments, exploit kits, fake software updates, RDP brute-force |
| File Extensions Added | Varies by campaign; commonly appends a unique ID + contact email or simply a custom extension (e.g., .locked, .encrypted, or campaign-specific markers) |
| Encryption Algorithm | Typically AES or RSA hybrid (strong cryptography—file recovery without the key is generally infeasible) |
| Ransom Note Filename | Varies; often HOW_TO_DECRYPT.txt, README.txt, or similar placed on the desktop and in encrypted folders |
| Payment Demand | Typically 0.5–2 Bitcoin (amount fluctuates with Bitcoin value); some variants demand several hundred to thousands of USD equivalent |
| Persistence Mechanism | Registry Run keys, scheduled tasks (varies by sample) |
| Network Behavior | Contacts command-and-control servers for key exchange; may scan local network for shared drives to encrypt |
| Removal Difficulty | Moderate (the malware itself can be removed with standard tools, but encrypted files remain locked without the decryption key or backups) |
How It Spreads
FileCoder.Ke ransomware most commonly arrives via phishing emails disguised as invoices, shipping notifications, or urgent account alerts. The messages contain either a malicious attachment—often a Microsoft Office document with embedded macros or a compressed executable file—or a link to a compromised website that silently downloads the payload. Users who enable macros "to view the document" or who download and run the attached file inadvertently launch the infection process.
Beyond email, this ransomware also spreads through exploit kits that target unpatched vulnerabilities in browsers, Flash, Java, and other plugins. Visiting a compromised or malicious website can trigger an automatic download if your system has known security gaps. Remote Desktop Protocol (RDP) brute-force attacks represent another significant vector: attackers scan the internet for exposed RDP ports, guess weak passwords, log in remotely, and manually deploy the ransomware payload. Small businesses with poorly secured remote access are particularly vulnerable to this method.
Additional distribution channels include:
- Fake software updates: Pop-ups claiming your Flash Player, codec, or browser needs an urgent update
- Pirated software and cracks: Executables bundled with "free" versions of commercial software or key generators
- Malvertising: Malicious advertisements on legitimate websites that redirect to exploit kit landing pages
- Infected USB drives: Less common but still viable, especially in office environments where users share physical media
- Secondary payloads: Other malware (trojans, info-stealers) that download ransomware as a follow-up stage
What It Does On Your Machine
Once executed, FileCoder.Ke operates in multiple phases. The initial dropper—often a small executable or script—establishes persistence by creating registry entries or scheduled tasks to survive reboots. It may disable Windows Defender or tamper with shadow copies (Windows' built-in backup feature) by executing commands like vssadmin delete shadows /all /quiet, eliminating an easy recovery path. The malware then contacts its command-and-control server to exchange encryption keys, although some variants generate keys locally if the connection fails.
The encryption phase targets a wide range of file types: documents (.docx, .xlsx, .pdf), images (.jpg, .png, .psd), databases (.sql, .mdb), archives (.zip, .rar), and more. The malware systematically scans all accessible drives—including mapped network shares and external USB drives—encrypting files one by one. Each encrypted file receives a new extension or has its original extension preserved with additional markers appended. The process can take anywhere from a few minutes on a lightly populated system to several hours on a machine with hundreds of gigabytes of data.
When encryption completes, FileCoder.Ke drops ransom notes in multiple locations: the desktop, each folder containing encrypted files, and sometimes as a changed desktop wallpaper. These notes provide instructions for payment, usually directing victims to a Tor-based payment portal where they must enter a unique ID to receive Bitcoin wallet details. The note typically includes threats of permanent data loss if payment isn't received within 48–96 hours, although these deadlines are often empty threats designed to create panic.
Manual Removal — Step by Step
Isolate the Infected System
Immediately disconnect from the internet by unplugging the Ethernet cable or disabling Wi-Fi. Disconnect any external drives, USB sticks, and mapped network shares to prevent the ransomware from encrypting additional data. If you're on a business network, notify your IT contact or administrator so they can isolate your machine at the switch level and check other systems for signs of infection.
Boot Into Safe Mode with Networking
Restart your computer and repeatedly press F8 (or Shift+F8 on some systems) during boot to access the Advanced Boot Options menu. Select "Safe Mode with Networking." This loads Windows with minimal drivers and prevents most malware from launching automatically, while still allowing you to download removal tools if needed. On Windows 10/11, you may need to use Settings > Update & Security > Recovery > Advanced startup instead.
Identify and Terminate Malicious Processes
Open Task Manager (Ctrl+Shift+Esc) and look for suspicious processes—common names include fake system processes like "svchost32.exe" running from a user directory, or random alphanumeric executables. Note the process name and location, then right-click and select "End Task." If the process won't terminate or respawns immediately, proceed to the next step anyway; removal tools will handle stubborn processes.
Remove Persistence Mechanisms
Press Win+R, type msconfig, and hit Enter. Under the "Startup" tab (or "Open Task Manager" on newer Windows), disable any unfamiliar startup entries, particularly those pointing to AppData folders or Temp directories. Next, open Registry Editor (regedit) and navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run and HKEY_LOCAL_MACHINE\...\Run. Delete any entries pointing to suspicious executables. Also check Task Scheduler (taskschd.msc) for recently created tasks that launch unknown programs.
Delete the Malware Binary
Using File Explorer with hidden files visible (View > Hidden items), navigate to the locations you identified earlier—typically %LOCALAPPDATA%, %APPDATA%, or %TEMP%. Delete the entire folder containing the malicious executable. If Windows prevents deletion, use a tool like Unlocker or IObit Unlocker to release file locks, or delete from Safe Mode. Empty the Recycle Bin when finished.
Run a Full Scan with Malwarebytes
Download Malwarebytes Free (from a clean machine if necessary, transfer via USB) and install it. Run a full "Threat Scan," which typically takes 30–60 minutes. Malwarebytes excels at detecting ransomware remnants, including registry modifications and leftover scripts. Quarantine all detected items and restart when prompted. Follow up with a scan using your primary antivirus (Windows Defender, Kaspersky, etc.) as a second opinion.
Check for Browser Hijacking
Some ransomware variants modify browser settings to display persistent ransom messages. Open your browsers (Chrome, Edge, Firefox) and reset them to default settings. In Chrome: Settings > Reset settings > Restore settings to their original defaults. In Firefox: Help > More troubleshooting information > Refresh Firefox. Remove any unfamiliar extensions and clear browsing data including cookies and cache.
Assess File Damage and Recovery Options
FileCoder.Ke's encryption is cryptographically strong—files cannot be decrypted without the attacker's key. Check NoMoreRansom.org for any available decryptors for this specific variant (some older ransomware families have been cracked). If you have backups, verify they're clean before restoring. Never restore from backup while the infection is still active, or it will re-encrypt your files. If no decryptor exists and you have no backups, data recovery is unfortunately not possible through legitimate means.
Change Passwords from a Clean Device
If you entered any passwords after infection or if the malware had sufficient time to operate, assume your credentials may have been logged by an info-stealing component. From a known-clean device (a smartphone or another computer), change passwords for critical accounts: email, banking, cloud storage, and work systems. Enable two-factor authentication wherever possible.
Reboot Normally and Verify Cleanliness
Restart your computer into normal mode and monitor behavior for 24–48 hours. Watch for unusual CPU usage, unexpected network activity, or any return of ransom messages. Run one final quick scan with Malwarebytes and your antivirus to confirm the system is clean. If you notice any suspicious behavior, bring the machine to our shop—some ransomware variants are bundled with rootkits or secondary payloads that require professional removal.
Prevention
- Maintain offline backups: Use the 3-2-1 rule—three copies of your data, on two different media types, with one copy stored offline (an external drive disconnected after backup completes). Cloud backups alone aren't sufficient if ransomware reaches your cloud sync folder.
- Keep Windows and all software updated: Enable automatic updates for Windows, Office, Adobe products, Java, and browsers. Most ransomware exploits known vulnerabilities that have been patched—running outdated software leaves the door wide open.
- Disable macros by default: In Microsoft Office, go to File > Options > Trust Center > Trust Center Settings > Macro Settings and select "Disable all macros with notification." Only enable them for documents from absolutely trusted sources, and verify legitimacy through a separate communication channel.
- Use a reputable antivirus with real-time protection: Windows Defender is adequate for most users if kept updated, but consider a dedicated solution with ransomware-specific behavioral detection (Kaspersky, Bitdefender, ESET). Pair it with Malwarebytes Premium for layered defense.
- Secure Remote Desktop Protocol: If you must expose RDP to the internet, use a VPN, enable Network Level Authentication, change the default port (3389), enforce strong passwords, and implement account lockout policies. Better yet, use a remote access solution designed for security like TeamViewer or AnyDesk with two-factor authentication.
- Train yourself and employees to recognize phishing: Be suspicious of unexpected attachments, urgent requests, misspellings in sender addresses, and links in unsolicited emails. When in doubt, contact the supposed sender through a known phone number or website—not by replying to the suspicious email.
- Restrict user permissions: Don't run daily operations from an administrator account. Standard user accounts can't modify system files or install software easily, limiting the damage ransomware can inflict. Use admin credentials only when explicitly installing legitimate software.
- Enable Windows Shadow Copies and File History: While ransomware often deletes these, having them enabled provides an additional recovery layer if you catch the infection early. File History to an external drive (kept disconnected when not backing up) offers even better protection.
Bring It In
FileCoder.Ke ransomware is a serious threat that often leaves victims facing the permanent loss of irreplaceable files—family photos, business records, creative projects. While the manual removal steps above can eliminate the malware itself, they won't decrypt your files without the attacker's key. If you're facing this situation, we can help assess your recovery options, check for available decryptors, and prevent reinfection. We'll also evaluate whether professional data recovery services (for pre-encryption file fragments) make sense for your specific case, and we'll be honest about the likelihood of success.
We're located in Roswell, Georgia, and we've handled hundreds of ransomware cases over the years. Bring your infected machine to our shop at 1965 Vaughn Road NW, Suite 104, Kennesaw, GA 30144, or call us at (770) 954-1957 to discuss your situation before coming in. We'll provide a realistic assessment of your options, help you implement a backup strategy so this never happens again, and get your system back to a secure, trustworthy state. Don't let the criminals win—let's work through this together and make sure your data stays protected going forward.