How to eliminate zEus stealer-type malware from the operating system

What kind of malware is zEus?

zEus is a malicious program classed as a stealer. It is designed to steal information from devices. This malware can extract and exfiltrate a variety of vulnerable data from devices, including the log-in credentials of various accounts. zEus has been observed being distributed under the guise of Minecraft source packs.

zEus malware overview

There are several variants of the zEus stealer, and both of the currently known versions were proliferated as source packs for the Minecraft video game (although in different files). Note that this malware could be proliferated utilizing other disguises as well.

zEus has anti-analysis capabilities. The malicious program has a device name exclusion list; this is used to avoid execution on test machines used by known malware analysts. It can also detect when it is launched on certain virtual machines or in sandbox environments.

If it is determined that the stealer was executed on a genuine system rather than a test machine, it starts collecting relevant data. For example, hardware details, operating system data, installed software (including security tools), running processes, Wi-Fi passwords, etc.

zEus obtains the IP address and uses additional tools to extract detailed information, e.g., city, longitude/latitude, postal code, Internet service provider, used proxy servers or mobile networks, etc.

The stealer targets Google Chrome, Mozilla Firefox, Microsoft Edge, Opera, Brave, and Vivaldi. From these browsers, it can obtain log-in credentials (usernames/passwords), Internet cookies, browsing histories, shortcuts, bookmarks, etc.

zEus also seeks log-in credentials for video games and gaming-related software, such as osu!, Growtopia, Steam, and Roblox. It also gathers other information (like logs files) associated with Battle.net, Electronic Arts, Epic Games, Minecraft, and Ubisoft.

Data linked to messengers is of interest to zEus as well, e.g., Telegram and Discord (from the latter, it can acquire tokens and log-in credentials). Additionally, the stealer browses devices for information connected to Xbox games and the following cryptowallets – Armory, Atomic, Bytecoin, Coinomi, Ethereum, Exodus, Guarda, Jaxx, and Zcash.

zEus searches the Downloads folder for filenames containing keywords associated with signing-in mechanisms, 2FA/MFA, and words relating to banks, accounts, and passwords in French – e.g., "2fa", "acount", "account", "backup", "banque", "code", "compte", "data", "db", "exodus", "key", "login", "mdp", "memo", "metamask", "motdepasse", "mot_de_passe", "password", "paypal", "recovery", "secret", "seed", "token", and "wallet".

During the infection process, this malware drops multiple files for extra functionality. These include the ability to take screenshots and kill the Task Manager. zEus can display (partially) screen-locking messages; known screens include a black fullscreen and a pop-up warning against closing explorer.exe and restarting the device.

Another dropped file – "CHATBOX.bat" – can create a dialog box that serves as a chat wherein the victim can send up to five sentences to the cyber criminals behind the attack.

It is noteworthy that malware developers commonly improve upon their creations and methodologies. Hence, potential future iterations of zEus could have additional/different functionalities. Furthermore, the data gathered by this stealer could be utilized to cause further infection.

To summarize, the presence of software like zEus on devices can lead to system infections, serious privacy issues, financial losses, and identity theft.

Stealer-type malware examples

We have investigated countless malicious programs; Ledger wallet stealer, WaveStealer, Ghostly, VacBan, Sams, and Nova are merely some of our newest articles on stealers. Information-stealing malware may target incredibly specific details or a wide variety of data.

Some elements of information collection and theft are common for various malware types. Yet regardless of whether a malicious program steals data or has other capabilities – its presence on a system endangers device safety and user privacy. Therefore, all threats must be eliminated immediately upon detection.

How did zEus infiltrate my computer?

As previously mentioned, the latest known variant of zEus has been proliferated disguised as a Minecraft source pack shared via YouTube.

The same general disguise (Minecraft source pack) was also used for the older version, which arrived onto devices in a self-extracting WinRAR file. This archive impersonated a Windows screensaver file, and upon the stealer's execution – the image used as a thumbnail was opened.

The newer variant is spread as a ZIP archive containing a batch file (BAT). The latter drops multiple files (including several BATs), which provide additional functionality to the malware.

It must be mentioned that zEus could be distributed under different disguises or by other methods. Generally, malicious software is proliferated by employing phishing and social engineering techniques. It is typically presented as or bundled with a legitimate/ordinary files. They can be archives (RAR, ZIP, etc.), executables (.exe, .run, etc.), documents (Microsoft Office, Microsoft OneNote, PDF, etc.), JavaScript, and so on.

Malware is primarily spread through dubious download sources (e.g., freeware and free file-hosting websites, P2P sharing networks, etc.), online scams, drive-by (stealthy/deceptive) downloads, malicious attachments/links in spam (e.g., emails, SMSes, DMs/PMs, social media/ forum posts, etc.), malvertising, pirated programs/media, illegal software activation tools ("cracks"), and fake updates.

Some malicious programs can self-proliferate via local networks and removable storage devices (e.g., external hard drives, USB flash drives, etc.).

How to avoid installation of malware?

We highly recommend downloading only from official and verified channels. Additionally, all programs must be activated and updated using legitimate functions/tools, as those acquired from third-parties can contain malware.

Another recommendation is to be vigilant while browsing, as fraudulent and dangerous online content typically appears genuine and harmless. Incoming emails and other messages must be treated with caution. Attachments or links found in suspicious/irrelevant mail must not be opened, as they can be infectious.

It is paramount for device/user safety to have a reputable anti-virus installed and kept updated. Security software must be used to run regular system scans and to remove threats/issues. 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.

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 zEus malware, should I format my storage device to get rid of it?

Malware removal rarely necessitates such drastic measures.

What are the biggest issues that zEus malware can cause?

The dangers posed by an infection depend on the malicious program's abilities and the attackers' modus operandi. zEus is a stealer that seeks a variety of sensitive data. Infections of this kind are associated with severe privacy issues, financial losses, and identity theft.

What is the purpose of zEus malware?

Malware is most commonly used to generate revenue. However, cyber criminals can also use malicious software to amuse themselves or disrupt processes (e.g., websites, services, companies, organizations, etc.). Alternative motives for these attacks include personal grudges, hacktivism, and political/geopolitical reasons.

How did zEus malware infiltrate my computer?

zEus was noted being spread as a Minecraft source pack shared on YouTube. Keep in mind that other disguises/techniques could be used to proliferate this stealer.

Generally, malware is distributed via drive-by downloads, spam mail, online scams, untrustworthy download channels (e.g., freeware and third-party websites, P2P sharing networks, etc.), pirated content, illegal software activation ("cracking") tools, and fake updates. Furthermore, some malicious programs can self-spread through local networks and removable storage devices.

Will Combo Cleaner protect me from malware?

Yes, Combo Cleaner is designed to scan computers and eliminate all kinds of threats. It is capable of detecting and removing most of the known malware infections. Note that since sophisticated malicious programs usually hide deep within systems – running a full system scan is crucial.