Gunra is a ransomware-as-a-service operation that emerged in April 2025, built on leaked source code from the notorious Conti ransomware. What makes Gunra particularly dangerous is its double-extortion model: the attackers encrypt your files and steal copies of your sensitive data before demanding payment. If you don't pay within their strict 5-day deadline, they publish your stolen information on dark-web leak sites. This threat has hit businesses across healthcare, manufacturing, pharmaceuticals, and critical infrastructure worldwide, and home users with valuable personal data are increasingly finding themselves in the crosshairs.
Threat Profile
| Threat Name | Gunra |
|---|---|
| Threat Type | Ransomware (Double-Extortion) |
| Platform | Windows (WIN) |
| File Type | Windows PE Executable |
| First Observed | April 2025 |
| Service Model | Ransomware-as-a-Service (RaaS) |
| Primary Targets | Healthcare, Pharmaceuticals, Manufacturing, Critical Infrastructure, Real Estate |
| Encryption Payment Deadline | 5 days (strict enforcement with leak-site publication) |
| Known Aliases | Gunra |
| Based On | Conti ransomware (leaked source code) |
| Data Exfiltration | Yes (business documents, credentials, personal files) |
| Last Updated | August 3, 2026 (Malpedia) |
How It Spreads
Gunra operators rely on a multi-pronged distribution strategy typical of professional ransomware-as-a-service syndicates. Because Gunra is sold to multiple affiliate groups, the infection vectors vary, but certain patterns have emerged consistently across incidents we've handled at the shop and through industry reporting.
The most common entry point is phishing emails with malicious attachments or links. These aren't the obviously fake "You've won the lottery!" messages of years past—Gunra affiliates craft convincing business correspondence, fake invoice notifications, shipping confirmations, or HR documents that prompt you to open a Word document or click a link. Once you do, the initial dropper begins its work. Remote Desktop Protocol (RDP) exploitation is another major vector: attackers scan the internet for exposed RDP connections (common on small-business networks and home servers), then use stolen credentials from previous breaches or brute-force weak passwords to gain access.
- Phishing emails with weaponized Office documents or malicious links
- Compromised RDP credentials obtained through credential-stuffing or brute-force attacks
- Exploit kits and software vulnerabilities in unpatched systems (VPNs, routers, network appliances)
- Malvertising and fake software updates delivered through compromised websites
- Supply-chain compromises via trusted third-party software installers or updates
- Lateral movement from previously infected devices on the same network
What It Does On Your Machine
Once Gunra executes, it moves quickly and methodically. The ransomware's behavior is multi-stage: first, it establishes persistence and disables your defenses; second, it quietly exfiltrates data to attacker-controlled servers; third, it encrypts your files; and finally, it delivers the ransom demand. Because Gunra is based on Conti's leaked code, it inherits that family's aggressive threading model, meaning it can encrypt files across multiple CPU cores simultaneously—your entire system can be locked down in minutes.
During the initial execution phase, Gunra typically drops files into common Windows directories and modifies registry keys to ensure it survives reboots. It disables Windows Defender, tampers with system restore points, and may delete Volume Shadow Copies to eliminate easy recovery options. Then, before any encryption begins, the malware scans for valuable data—business documents, financial records, photos, databases, email archives—and uploads copies to remote servers controlled by the attackers. This data theft happens silently in the background and is the foundation of the "double-extortion" model.
The encryption phase targets hundreds of file extensions, prioritizing documents, images, databases, and backups. Gunra appends a unique extension to encrypted files (the exact extension varies by campaign) and drops ransom notes in every affected folder. The notes contain instructions for contacting the attackers via Tor-based chat portals, along with the strict 5-day payment deadline. Miss that deadline, and your stolen data appears on their public leak site, where competitors, journalists, or malicious actors can access it.
Home users often discover the infection only after encryption completes—when they try to open family photos or tax documents and see garbled filenames with unfamiliar extensions. Small-business owners may notice network drives suddenly inaccessible or receive frantic calls from employees who can't access shared files. By that point, the data exfiltration has already happened, and the clock on the 5-day deadline is ticking.
Manual Removal — Step by Step
Disconnect From All Networks Immediately
The moment you suspect Gunra, unplug your ethernet cable and turn off Wi-Fi. If you're on a business network, alert your IT contact so they can isolate other machines. This prevents further encryption of network shares and stops ongoing data exfiltration. Do not reconnect until the infection is fully remediated.
Boot Into Safe Mode With Networking
Restart your computer and enter Safe Mode. On Windows 10/11, hold Shift while clicking Restart, then navigate to Troubleshoot > Advanced Options > Startup Settings > Restart, and select Safe Mode with Networking (option 5). This limits Gunra's ability to execute fully and allows you to download removal tools.
Run a Full System Scan With Updated Antimalware
Download and run Malwarebytes (free trial) or another reputable anti-malware tool. Ensure definitions are up to date. Perform a full system scan—this can take 60-90 minutes. The tool should detect and quarantine the Gunra executable and any associated dropper components. Do NOT skip this step; partial removal leaves backdoors active.
Check and Remove Persistence Mechanisms
Open Registry Editor (regedit) and navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run and HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run. Look for unfamiliar entries with random names or paths pointing to C:\ProgramData or AppData\Roaming. Delete suspicious entries. Also check the Startup folder (shell:startup in File Explorer) for unknown executables.
Restore System Settings and Shadow Copies
Open Command Prompt as Administrator and run bcdedit /set {default} recoveryenabled Yes to re-enable Windows Recovery. Check if any Volume Shadow Copies survived by running vssadmin list shadows. If backups exist, you may be able to restore individual files via Previous Versions (right-click a folder, select Properties > Previous Versions). This rarely works with Gunra, but it's worth trying.
Assess Encrypted Files and Explore Decryption Options
Check reputable resources like Emsisoft's decryption tools or No More Ransom for any available Gunra decryptors. As of now, no universal decryptor exists for Gunra due to its strong encryption. If you have offline backups (external drives, cloud storage), verify they're clean before restoring. Do NOT restore from backups until the infection is completely removed.
Change All Passwords and Enable MFA
Assume your credentials were stolen during the exfiltration phase. Change passwords for email, banking, cloud storage, and any business accounts—from a different, clean device if possible. Enable multi-factor authentication (MFA) everywhere it's available. This limits the damage if attackers already harvested your logins.
Monitor for Signs of Reinfection or Backdoors
Ransomware operators often leave backdoors for future access. Over the next two weeks, watch for unusual network activity, unexpected pop-ups, or spontaneous reboots. Run periodic scans with your anti-malware tool. If you notice anything suspicious, bring the machine to us immediately—partial removal is common when attempting DIY fixes.
Document Everything for Potential Reporting
If you're a business or if significant financial/personal data was compromised, document the incident: ransom note screenshots, file paths, timestamps. Report to local law enforcement and, if applicable, the FBI's IC3 (ic3.gov). This won't recover your files, but it contributes to takedown efforts and may support insurance claims.
Consider Professional Remediation
Manual removal of Gunra is complex and error-prone. If you're uncertain at any step, or if the infection spread across multiple machines, call Computer Repair Roswell at (770) 587-4309. Our techs use forensic-grade tools to ensure complete eradication, check for backdoors, and help you implement a recovery strategy—often saving your data without paying criminals.
Prevention
- Maintain offline, encrypted backups. Use the 3-2-1 rule: three copies of data, on two different media types, with one stored offline. External drives should be disconnected when not actively backing up. Cloud backups should have versioning enabled to recover from ransomware corruption.
- Disable or secure Remote Desktop Protocol (RDP). If you don't need RDP, turn it off entirely. If you do need it, use a VPN for access, enforce strong passwords (12+ characters), enable Network Level Authentication, and implement account lockout policies to thwart brute-force attempts.
- Keep all software and operating systems patched. Enable automatic updates for Windows, browsers, and third-party applications. Gunra affiliates exploit known vulnerabilities in outdated VPN clients, routers, and business software. Patch Tuesday should be sacred in your household or office.
- Deploy reputable endpoint protection with behavioral detection. Modern anti-malware solutions (Malwarebytes Premium, Windows Defender for Business, enterprise EDR) can detect ransomware by behavior—unusual file access patterns, registry tampering, shadow-copy deletion—even when signature-based detection fails.
- Train yourself and employees to recognize phishing. Most Gunra infections start with a single clicked link or opened attachment. Be skeptical of unexpected emails, especially those with urgent language or requests to enable macros. Hover over links before clicking; verify sender addresses; when in doubt, call the supposed sender directly.
- Implement network segmentation and least-privilege access. Business users should operate with standard accounts, not admin privileges. Segment your network so that a compromise in one area (say, a guest Wi-Fi user) can't easily spread to critical servers or workstations.
- Use multi-factor authentication (MFA) everywhere possible. Even if attackers steal your password via phishing or data breach, MFA (authenticator apps, hardware tokens) blocks unauthorized logins. Enable it for email, cloud storage, banking, and remote access tools.
- Monitor network traffic for anomalies. Businesses should deploy intrusion detection systems (IDS) or log analysis tools that flag unusual outbound connections—especially large data transfers to unfamiliar IPs, which signal exfiltration. Home users can enable router logging and review it periodically, though this requires some technical comfort.
When we clean a Gunra infection at Computer Repair Roswell, we guarantee our work for 90 days. If the same threat reappears within that window, we'll re-clean your system at no charge. We use multi-layered scanning, manual forensic checks, and post-remediation hardening to ensure the infection is truly gone—not just hidden. You're not just paying for malware removal; you're paying for peace of mind.
Bring It In
Gunra is a serious, business-grade threat that's increasingly hitting home users with valuable data or small-office setups. If you've been infected, or if you're worried your defenses aren't up to the task, don't gamble with DIY fixes or ignore the problem. The 5-day deadline is real, and paying the ransom rarely guarantees data recovery—plus it funds future attacks. Our certified technicians at Computer Repair Roswell have handled dozens of ransomware cases, and we know how to assess damage, remove the infection thoroughly, and help you recover whatever data is salvageable.
We're located right here in Roswell, Georgia, and we offer same-day emergency appointments for active infections. Call us at (770) 587-4309 or stop by the shop—bring the infected machine, any external drives, and a list of what data matters most to you. We'll give you an honest assessment, a clear price quote, and a realistic timeline. Whether you're a homeowner who just lost family photos or a small-business owner facing a potential data-leak disaster, we're here to help you get back on your feet without paying a dime to criminals.