How to prevent Legion Loader from causing system damage

What is Legion Loader?

Legion Loader is a malicious program designed to infect systems with 2-3 other programs of this type (or more). Research shows that Legion Loader is used to spread information stealers (such as Vidar, Predator the Thief and Raccoon Stealer), backdoors, cryptocurrency stealers and a cryptocurrency miner.

Legion Loader can thus cause many problems. If a system is infected with this malware (or other malicious software installed through it), it should be removed immediately.

The aforementioned information stealers record details that could be used to generate revenue in various ways. For example, Vidar can steal IP addresses, browsing histories, cryptocurrency wallets, saved passwords, data from messaging clients, and so on.

This malware can also take screenshots and infect systems with GandCrab 5.0.4 ransomware. Predator the Thief is capable of recording cookies, saved logins, passwords, and other information saved on web browsers. It is capable of stealing credentials of Steam, Discord, FileZilla, and WinFTP clients.

Racoon Stealer can be used to steal passwords, browser cookies and auto-fill data that is saved on victims' browsers. It can also be used to steal cryptocurrency wallet details. All of these malicious programs are employed by cyber criminals to steal sensitive information.

Generally, they target details that can be misused to make fraudulent transactions and purchases, and perform actions to generate revenue, thereby causing victims financial loss. Furthermore, one of the Legion Loader's payloads is a 'backdoor'.

Software of this type allows cyber criminals to control infected machines remotely - it provides them with remote access to victims' computers. Typically, backdoors are used to infect computers with additional malware and perform other malicious tasks.

Furthermore, Legion Loader contains a built-in PowerShell-based cryptocurrency stealer, which checks for used cryptocurrency wallets and steals wallet files and stored cryptocurrency-related credentials. It uploads the stolen information to a command and control (C&C) server controlled by cyber criminals.

Legion Loader is also able to install a cryptocurrency miner. Programs of this type use computer hardware to mine cryptocurrency. In most cases, this process causes high GPU and/or CPU usage and increases electricity consumption, thus leading to higher electricity bills. Generally, software of this type is distributed to generate revenue at the victim's expense.

People who have computers infected with Legion Loader are exposed to risk of identity theft, monetary and/or data loss, problems relating to privacy, installation of other malware, and so on. Legion Loader is high-risk malware and should be removed immediately.

It is unknown exactly how cyber criminals proliferate this program, however, it is likely to be via a popular malware distribution method.

How did Legion Loader infiltrate my computer?

In most cases, cyber criminals proliferate malicious software using spam campaigns (emails), fake software updaters, untrustworthy software download channels and tools, Trojans, and unofficial activation ('cracking') tools. Using spam campaigns, they send emails that contain malicious attachments or web links that download malicious files.

Examples of files that they attach are Microsoft Office, PDF documents, executable files (.exe), JavaScript files and archives such as ZIP, RAR, etc. If opened, these attachments cause installation of malicious software.

Fake software updating tools usually infect systems by exploiting flaws/bugs or other vulnerabilities of outdated programs installed on the operating system (by installing malicious programs rather than updating those installed).

Peer-to-Peer networks (e.g., eMule, torrent clients), third party downloaders, freeware and free file hosting pages and other similar download channels/sources are often used to proliferate malware. Systems become infected when people download and open a malicious file that was uploaded by cyber criminals.

Typically, these files are disguised as harmless and legitimate. Trojans are malicious programs that often cause chain infections. Therefore, if a system is already infected with a Trojan, this malicious program will cause installation of additional malware.

Unofficial activation ('cracking') tools are programs that supposedly activate other, paid (licensed) software free of charge (i.e., to bypass paid activation), however, they are designed by cyber criminals who seek to proliferate malware. People who use these tools risk infecting their systems with high-risk malware.

How to avoid installation of malware

Do not trust irrelevant emails that contain attachments or web links, especially if they are received from unknown, suspicious addresses. Attached files might infect computers with malware. All software should be downloaded from official websites and via direct download links.

Other channels/tools cannot be trusted. Updates should not be installed through third party tools. The only safe way to update installed software is using tools and/or implemented functions that are designed by official developers. Installed software should not be activated through third party tools.

This is illegal and might cause installation of malware. Keep systems safe by regularly scanning them with reputable antivirus or anti-spyware software. It is important to ensure that installed software of this type is up to date. 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.

Legion Loader process in Task Manager ("eupanda.exe")

Update 7 January 2025 - Legion Loader has been found to deliver a harmful Chrome extension that can change email contents and track browsing activity. It also uses CursedChrome, a Chrome extension that turns compromised browsers into HTTP proxies, allowing attackers to browse websites as if they were the victims.

The extension can also take screenshots of the active tab, manage access to Facebook, Coinbase, and Google Pay accounts, and even perform financial actions like withdrawing cryptocurrency. Since August 2024, Legion Loader has been delivering stealers along with Chrome extensions such as LummaC2, Rhadamanthys, and StealC.

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.

Tools you'll need

Combo Cleaner Antivirus 7-days free trial

Recommended primary scanner. VB100 certified. The 7-day free trial is available.

Microsoft Defender Offline Free · built-in

Built into Windows. Boots to a clean environment to catch rootkits.

Process Explorer Free

From Microsoft Sysinternals. Better than Task Manager - shows full paths and signatures.

Autoruns Free

From Microsoft Sysinternals. Lists every place malware can persist on your system.

Microsoft Safety Scanner (MSERT) Free

Official Microsoft on-demand scanner. Always-current signatures - expires every 10 days.

Phase 1~ 5 min

Contain - limit the damage

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1

Disconnect from the network

30 secNo tool needed

Unplug your Ethernet cable and turn off Wi-Fi. If you're on a laptop, the airplane-mode key works fastest.

Why this matters

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.

2

Boot into Safe Mode with Networking

3 min

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.

Windows 11

Open Settings → System → Recovery. Click Restart now next to Advanced startup.

Your computer will restart into the "Choose an option" menu. Click Troubleshoot → Advanced options → Startup Settings → Restart. After the second reboot, press 5 or F5.

Windows 10

Click the Windows logo, hold Shift, click the Power icon and choose Restart. In the Choose an option screen, click Troubleshoot → Advanced options → Startup Settings → Restart. 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.

Phase 2~ 15 min

Identify - find what's hiding

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3

Inspect running processes with Process Explorer

Tool: Process Explorer5 min

Download Process Explorer from Microsoft Sysinternals. Run it as Administrator. Click Options → Verify Image Signatures and View → Lower Pane View → DLLs.

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.

Why not just Task Manager

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.

4

Map every persistence point with Autoruns

Tool: Autoruns 14.x10 min

Download Autoruns. Right-click Autoruns.exe and choose Run as administrator - without elevation, Autoruns can't inspect protected registry hives.

In the menu, open Options → Hide Microsoft Entries and Options → Hide Empty Locations, 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

Pro tip

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.

5

Check the hosts file and DNS settings

3 minBuilt into Windows

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 Settings → Network & internet → [your adapter] → DNS server assignment and verify both DNS and DNS over HTTPS (DoH) settings haven't been hijacked.

Why this matters

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.

Phase 3~ 60-90 min

Remove - three scans, one cleanup

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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.

6

Run Microsoft Defender Offline

Tool: Built into Windows15 min

Reboot to normal Windows. Open Windows Security → Virus & threat protection → Scan options. 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.

Why this comes first

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.

Recommended antivirus

Combo Cleaner

VB100 certified. Includes anti-trojan, registry/persistence scanning, anti-spyware in one pass. The 7-day free trial is available.

Download Combo Cleaner

7

Run Combo Cleaner full system scan

Tool: Combo Cleaner20-40 min

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.

8

Run Microsoft Safety Scanner as a second-opinion scan

Tool: Microsoft Safety Scanner15 min

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.

Why a second scan

Different scanning engines catch different threats. Running an additional Microsoft scan after Combo Cleaner is the single most underused verification step in malware removal.

9

Manually remove anything still listed in Autoruns

Tool: Autoruns10 min

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.

Important

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).

Phase 4~ 15 min

Recover - restore browsers and security

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10

Reset browsers and clear notification permissions

5 min

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/reset and click "Restore settings to their original defaults." Then visit chrome://settings/content/notifications and remove any unfamiliar sites.
• Edge: visit edge://settings/reset. Then check edge://settings/content/notifications.
• Firefox: open about:support and 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.

11

Re-enable Defender, Tamper Protection, and update everything

10 min

Many trojans disable security software. Open Windows Security → Virus & threat protection → Manage settings 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 (Settings → Windows Update → Check for updates) and update your browsers and applications. The infection vector that let the trojan in originally usually involves outdated software.

Phase 5~ 15 min + 7 days

Verify & secure

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12

Change passwords from a clean device

20 min⚠ Critical

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:

1. Primary email first - it's the recovery hub for everything else
2. Banking and financial accounts
3. Password manager master password (if you use one)
4. 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.

13

Verify the clean and monitor for 7 days

5 min + 1 week monitoring

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 Settings → System → Recovery → Reset this PC → Remove everything → Cloud download. 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 Legion Loader, should I format my storage device to get rid of it?

If your computer is infected with Legion Loader, formatting your storage device is one way to remove the malware, but it is an extreme measure. Before taking this step, consider using a security tool, like Combo Cleaner, to scan your entire system and remove the malware.

What are the biggest issues that malware can cause?

Malware can cause various issues, such as data loss, theft of personal information or money, system crashes, and slow performance. It can also lead to additional infections.

What is the purpose of Legion Loader?

The purpose of Legion Loader is to deliver malicious payloads, It typically serves as a delivery mechanism for other harmful software, like malicious Chrome extensions, ransomware, or information stealers.

How did Legion Loader infiltrate my computer?

The loader is spread through drive-by downloads, where users are misled into visiting websites (like RapidShare and MEGA) that host fake installer files. Users unknowingly infect their computers with Legion Loader malware when they download and execute these files.

Will Combo Cleaner protect me from malware?

Yes, Combo Cleaner can detect and remove almost all known malware infections. However, advanced malware often hides deep within the system, so it is essential to perform a full system scan to ensure removal.