How to remove Dolphin X RAT trojan from the operating system
TrojanAlso Known As: Dolphin X remote access trojan
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What kind of malware is Dolphin X RAT?
Dolphin X RAT is a multi-purpose Windows malware sold as a subscription service to cybercriminals. It combines a Remote Access Trojan (RAT), information stealer, cryptocurrency clipper, and distributed denial-of-service (DDoS) tool in a single package.
Research published by Varonis Threat Labs documents Dolphin X targeting over 300 applications across ten categories, with an operator panel containing 329 features. A cybercriminal using the alias "Kontraktnik" sells access to the platform on underground forums at 69.95 euros per month.
What sets Dolphin X apart from many similar tools is a built-in AI behavioral profiler. It analyzes data from each infected machine and assigns a risk score, letting operators rank victims and focus on the highest-value targets first. BleepingComputer has also reported on this AI ranking capability.
Dolphin X RAT overview
Dolphin X operates as a Malware-as-a-Service (MaaS) platform. Operators purchase a subscription, access an online control panel, and receive malware builds compiled server-side at the vendor's backend infrastructure. This remote compilation model means each build is assembled at the vendor's servers rather than on the operator's own machine.
Varonis Threat Labs researcher Daniel Kelley examined the operator panel, builder, and network traffic. The analysis identified strings confirming an active AI profiling workflow, including references to risk scoring and profiler data retrieval.
All data stolen from an infected machine is staged into a single archive before exfiltration. The malware is designed to run silently, leaving few visible indicators on the compromised system.
Data theft capabilities
Dolphin X's stealer module targets nine Chromium and Gecko-based browsers, pulling saved passwords, cookies, autofill entries, and bookmarks. It also reaches 100 cryptocurrency wallet browser extensions and 65 desktop wallet applications, including Exodus and MetaMask.
WiFi passwords stored on the system are harvested, and the Windows Credential Manager is dumped for any saved credentials. A sensitive file hunter scans the machine for documents and files that may interest the operator.
Developer and cloud credentials are a specific focus. The stealer collects SSH keys, .env files, cloud access tokens, and data from over 30 cloud command-line tools. Ten password manager applications are also in scope.
Session data from Discord, Telegram, Steam, and Minecraft is captured, along with credentials from sysadmin tools including FileZilla, WinSCP, and PuTTY.
Remote control, surveillance, and clipping
The remote control module gives operators live access to the infected machine. A remote desktop feature allows viewing and interacting with the victim's screen in real time. A reverse shell enables direct command execution, and a built-in file manager and network scanner complete the core toolkit.
An HVNC (Hidden Virtual Network Computing) module creates a parallel desktop session invisible to the victim. Operators can work within this hidden session without triggering any visible indication of activity on the victim's screen.
A SOCKS5 reverse-proxy capability routes operator traffic through the infected machine. The cryptocurrency clipper watches the Windows clipboard and silently swaps any copied wallet address with one the attacker controls, redirecting cryptocurrency payments without the victim noticing.
Persistence, defense evasion, and offensive capabilities
Dolphin X achieves persistence through Windows Registry Run key entries, the Windows startup folder, scheduled tasks, and Windows service installation. A UEFI bootkit module is also listed among its persistence options, capable of surviving even a full operating system reinstall.
Defense evasion is a core strength. The malware patches AMSI and ETW - two Windows interfaces used by security software - and uses direct system calls to sidestep user-mode API hooks. It can also bypass User Account Control (UAC) using eight different methods.
A three-tier mutation engine makes each build appear unique. The first tier rewrites control flow and re-encrypts embedded strings. The second shuffles import tables. The third modifies PE timestamps, Rich headers, and section padding.
Additional capabilities include manipulating Windows Defender, editing the firewall and Hosts file, applying anti-forensics techniques, and spreading to connected USB drives. The DDoS module supports over 20 attack methods, and botnet-style proxying and control are available as well.
System manipulation features allow the malware to block Windows updates, restrict Task Manager and Registry Editor access, inject code via DLL injection and shellcode injection, and trigger a Blue Screen of Death on demand.
AI-powered victim profiling
The AI behavioral profiler is one of Dolphin X RAT's most distinctive features. It automatically analyzes data from each infected machine - including installed applications, browsing activity, and software usage patterns - and generates a risk score and daily summary for each victim.
These scores allow operators to rank infected machines and focus first on the most valuable ones. According to Varonis, the profiler helps attackers identify machines likely to provide access to corporate networks, cloud environments, cryptocurrency holdings, or financial accounts.
The specific AI engine powering this feature has not been confirmed without live sample execution. That said, strings found during the Varonis analysis - including references to risk scoring and profiler startup routines - indicate the component is fully functional.
| Name | Dolphin X remote access trojan |
| Threat Type | RAT, Information Stealer, Clipper, Trojan |
| Symptoms | Remote Access Trojans are designed to stealthily infiltrate the victim's computer and remain silent, and thus no particular symptoms are clearly visible on an infected machine. |
| Distribution methods | Infected email attachments, malicious online advertisements, social engineering, software 'cracks', fake websites. |
| Damage | Stolen passwords and banking information, identity theft, cryptocurrency theft, the victim's computer added to a botnet, additional infections, monetary loss, account hijacking, remote control of the infected device. |
| Malware Removal (Windows) |
To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Combo Cleaner. Download Combo CleanerTo use full-featured product, you have to purchase a license for Combo Cleaner. 7 days free trial available. Combo Cleaner is owned and operated by RCS LT, the parent company of PCRisk.com. |
Conclusion
Dolphin X RAT gives cybercriminals a comprehensive toolkit for stealing data, controlling infected machines remotely, and clipping cryptocurrency transfers. The AI-powered victim profiler adds a targeting layer not typically found in malware of this type, helping operators focus on the most valuable compromised systems.
Victims can face stolen passwords, hijacked accounts, lost cryptocurrency, and unauthorized remote access to their devices. The malware's deep persistence options - including a UEFI bootkit - make it particularly hard to remove without dedicated security tools. It should be eliminated from the system without delay.
More examples of malware classified as a RAT are MarkiRAT, Starland, and DenoRAT.
How did Dolphin X RAT infiltrate my computer?
Dolphin X RAT is sold as a subscription service to cybercriminals, each of whom deploys it through their own chosen channels. The developer, known as "Kontraktnik," handles backend infrastructure and compiles builds server-side, giving subscribers a ready-to-deploy tool requiring minimal technical skill.
Common distribution methods used by MaaS operators include phishing emails with malicious attachments or links, fake software download websites, pirated software and cracks, and malvertising.
Attackers may also rely on fake installer sites impersonating legitimate software. Common file types used in such campaigns include executable installers, archive packages, and malicious document attachments. Being wary of unexpected download links and unsolicited email attachments is one of the most reliable defenses.
How to avoid installation of malware?
Download software only from official developer websites and verified platform stores. Avoid cracks, key generators, and pirated content, as these are common delivery vehicles for malware. Be cautious with unexpected emails, particularly those containing attachments or links, even when the sender appears to be someone you know.
Keep your operating system and all applications updated, as attackers frequently exploit vulnerabilities in outdated software. Use a reputable security solution and run regular system scans. If you believe that your computer is already infected, we recommend running a scan with Combo Cleaner Antivirus for Windows to automatically eliminate infiltrated malware.
Website promoting Dolphin X RAT:
Post on hacker forum promoting Dolphin X RAT:
How to remove malware manually?
Most trojan infections can be removed by running a full system scan with Combo Cleaner. The full manual procedure below is for cases where automatic removal failed, where you want to verify a scan caught everything, or where the threat has multiple persistence points.
Disconnect from the network
Unplug your Ethernet cable and turn off Wi-Fi. If you're on a laptop, the airplane-mode key works fastest.
Many trojans exfiltrate data - saved browser passwords, banking sessions, screenshots - and accept remote commands. Cutting the network stops both immediately. Keep it disconnected until Phase 4.
Boot into Safe Mode with Networking
Safe Mode loads a minimal set of drivers and stops most malware from auto-running. "With Networking" lets you download tools - re-enable Wi-Fi only after you've booted in.
Open . Click Restart now next to Advanced startup.
Your computer will restart into the "Choose an option" menu. Click . After the second reboot, press 5 or F5.
Click the Windows logo, hold Shift, click the Power icon and choose Restart. In the Choose an option screen, click . Press F5.
Windows 8
Go to the Start Screen, type Advanced, select Settings → Advanced startup options → Restart now → Troubleshoot → Advanced options → Startup settings → Restart → F5.
Note: Windows 8 reached end-of-life in January 2023 - running on it puts you at much higher risk of reinfection.
Windows 7
Click Start → Shut Down → Restart → OK. As the system boots, press F8 repeatedly until the Windows Advanced Options menu appears, then choose Safe Mode with Networking.
Note: Windows 7 reached end-of-life in January 2020 - running on it puts you at much higher risk of reinfection.
Inspect running processes with Process Explorer
Download Process Explorer from Microsoft Sysinternals. Run it as Administrator. Click and .
Sort by "Verified Signer." Anything unsigned running from %AppData%, %LocalAppData%, %Temp%, or %ProgramData% is suspicious. Right-click → Properties to see the full image path. Right-click → "Search Online" to look up unfamiliar process names.
Task Manager hides full file paths, doesn't show digital signatures, and groups processes in ways that make malware easy to miss. Process Explorer is the same tool Microsoft engineers use.
Map every persistence point with Autoruns
Download Autoruns. Right-click Autoruns.exe and choose Run as administrator - without elevation, Autoruns can't inspect protected registry hives.
In the menu, open and , then click Refresh.
Modern trojans don't just live in startup. Walk through these tabs and look for unsigned or unfamiliar entries:
- Logon - classic Run/RunOnce keys
- Scheduled Tasks - frequent hiding spot, especially tasks with PowerShell, MSHTA, or rundll32 actions
- Services - unsigned services in non-Microsoft folders
- WMI - Event Subscriptions are a stealthy persistence mechanism (MITRE T1546.003)
- Image Hijacks - Image File Execution Options "Debugger" abuse
- AppInit - DLLs loaded into every GUI process
- Browser plug-ins - unsigned add-ons across all installed browsers
Right-click any suspicious entry → "Jump to Image" to see the actual file. Right-click → "Search Online" opens VirusTotal for the file hash. Don't delete yet - just write down the file paths and entry names. We'll remove them after the scans.
Check the hosts file and DNS settings
Trojans often redirect bank, antivirus, and update domains to attacker-controlled servers by editing the hosts file or DNS settings.
Hosts file: Open Notepad as Administrator and open C:\Windows\System32\drivers\etc\hosts. Legitimate entries are commented with #. Any uncommented IP-to-domain mapping is suspicious - especially redirects for microsoft.com, windowsupdate, or your bank.
DNS settings: Open Command Prompt as Administrator and run ipconfig /all. Confirm your DNS servers point to your ISP, your router, or a known public resolver (Cloudflare 1.1.1.1, Google 8.8.8.8). Then open and verify both DNS and DNS over HTTPS (DoH) settings haven't been hijacked.
A clean PC with hijacked DNS is still a compromised PC. You'll think you're at chase.com and you'll be at the attacker's clone.
No single antivirus catches everything. The order below is intentional: offline scan first (catches rootkits before Windows fully loads), then on-demand scanners on the running system, then manual cleanup of anything they missed.
Run Microsoft Defender Offline
Reboot to normal Windows. Open . Select Microsoft Defender Antivirus (offline scan) and click Scan now. Your computer will restart into a stripped-down environment and scan before the full operating system loads.
Rootkits and bootkits hide from any scanner running on the same Windows session that's already infected. A pre-boot offline scan sees the disk before the malware can hide itself.
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Download Combo CleanerRun Combo Cleaner full system scan
Install Combo Cleaner and run a full system scan (not the quick scan). Let it complete fully, review the detected threats, and apply the recommended actions. Combo Cleaner will quarantine known trojans and registry persistence.
Run Microsoft Safety Scanner as a second-opinion scan
Download Microsoft Safety Scanner (MSERT.exe), Microsoft's free on-demand tool. The binary expires every 10 days, which means every download has the latest signatures. Run a full scan after Combo Cleaner to catch anything one engine alone might miss.
Different scanning engines catch different threats. Running an additional Microsoft scan after Combo Cleaner is the single most underused verification step in malware removal.
Manually remove anything still listed in Autoruns
Reopen Autoruns. Anything you flagged in Step 4 that's still present hasn't been caught by the automated scans. For each remaining suspicious entry: right-click → Delete in Autoruns (this removes the persistence registration), then navigate to the file path and delete the actual file. Empty the Recycle Bin.
Some malware files reappear after deletion because something else on the system recreates them. If you delete a file and it returns within minutes, you have a remaining persistence point that Autoruns didn't show - usually a service or scheduled task running under SYSTEM. Re-run the scans from Steps 6-8 or proceed to a clean install (see end of guide).
Reset browsers and clear notification permissions
Trojans and adware frequently hijack browsers - change the default search engine, install rogue extensions, or grant themselves notification permissions to keep displaying scam pop-ups even after the malware is gone.
- Chrome: visit
chrome://settings/resetand click "Restore settings to their original defaults." Then visitchrome://settings/content/notificationsand remove any unfamiliar sites. - Edge: visit
edge://settings/reset. Then checkedge://settings/content/notifications. - Firefox: open
about:supportand click Refresh Firefox (Firefox uses "Refresh," not "Reset"). Then check Settings → Privacy & Security → Permissions → Notifications.
Review installed extensions in each browser and remove anything you don't recognize, especially extensions you didn't install yourself.
Re-enable Defender, Tamper Protection, and update everything
Many trojans disable security software. Open and confirm Real-time protection, Cloud-delivered protection, and Tamper Protection are all turned on. Tamper Protection prevents malware from disabling Defender silently.
Then run Windows Update () and update your browsers and applications. The infection vector that let the trojan in originally usually involves outdated software.
Change passwords from a clean device
If the trojan was an info-stealer (Lumma, RedLine, Vidar, and similar are extremely common), assume every password saved in your browser is compromised. Change them from a different, known-clean device - your phone is fine if it's not infected.
Recommended order:
- Primary email first - it's the recovery hub for everything else
- Banking and financial accounts
- Password manager master password (if you use one)
- Social media, shopping, and remaining accounts
Where available, enable phishing-resistant multi-factor authentication (passkeys / FIDO2 hardware keys / authenticator apps) - SMS-based MFA is bypassable by sophisticated attackers.
Verify the clean and monitor for 7 days
Reconnect to the network and run one final full scan with Combo Cleaner. Open Task Manager (Ctrl + Shift + Esc) and switch to the Startup apps tab - confirm nothing suspicious has reappeared.
Over the next 7 days, watch for symptom recurrence: unexpected high CPU usage, unknown processes returning, browser redirects, or pop-ups. If anything returns, you missed a persistence point and the procedure needs to be repeated - or you may have a deeper compromise that requires a clean install.
When to clean install Windows instead
Manual removal isn't always the right answer. Reinstalling Windows from scratch is the only way to be 100% certain when:
- The malware reappears after every removal attempt
- A bootkit or UEFI rootkit was detected (this class of threat sits below the operating system and survives a normal Windows reinstall)
- A confirmed credential-theft trojan ran with administrator privileges (Lumma, RedLine, Vidar) - the system likely has multiple unknown payloads
- The PC is used for online banking, business email, or anything where partial doubt isn't acceptable
A clean install is a 30-60 minute process: Windows 11 reinstall via . Back up documents to external storage first, scan the backup with Combo Cleaner before restoring it, and reinstall applications fresh - never restore them from a backup of the infected system.
Important: Manual removal requires advanced computer skills. If you're not confident identifying system files from malicious files, run an automated scan with Combo Cleaner and Windows Defender and stop there - that path catches the vast majority of consumer trojans without the risk of breaking Windows by deleting the wrong file.
Frequently Asked Questions (FAQ)
My computer is infected with Dolphin X RAT malware, should I format my storage device to get rid of it?
Formatting will erase Dolphin X RAT along with all data on the drive. That is a last resort. Running a reputable security tool such as Combo Cleaner is the recommended first step and should remove the infection without destroying your files.
What are the biggest issues that Dolphin X RAT malware can cause?
Dolphin X RAT can steal passwords, session tokens, and cryptocurrency from hundreds of applications, allow attackers to remotely view and control the desktop, and add the machine to a DDoS botnet.
Victims may face identity theft, drained cryptocurrency wallets, unauthorized access to corporate or cloud accounts, and financial fraud - all without any visible sign that the machine is compromised.
What is the purpose of Dolphin X RAT malware?
The purpose of Dolphin X RAT is to give cybercriminals a comprehensive platform for stealing sensitive data, remotely controlling infected machines, and clipping cryptocurrency transactions. An AI profiler also ranks victims by value so operators can focus on the highest-priority targets.
How did Dolphin X RAT malware infiltrate my computer?
Dolphin X RAT is sold as a subscription service to cybercriminals who deploy it through their own channels. Common infection methods include phishing emails, fake software download sites, pirated software packages, and malvertising campaigns.
Will Combo Cleaner protect me from malware?
Yes. Combo Cleaner can detect and remove Dolphin X RAT and most other known malware. Because advanced threats can hide deeply in the system, running a full scan is the most reliable way to ensure the machine is completely clean.
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Tomas Meskauskas
Expert security researcher, professional malware analyst
I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats.
PCrisk security portal is brought by a company RCS LT.
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