How to remove BrowserVenom malware from the operating system

What kind of malware is BrowserVenom?

BrowserVenom is a piece of malicious software that operates as proxyware. It manipulates users' network traffic and gathers vulnerable information.

BrowserVenom was proliferated under the guise of DeepSeek. Evidence found within the infrastructure promoting the fake app suggests that it was created (and possibly used) by Russian-speaking cyber criminals. The scope of this campaign is likely worldwide, but large numbers of infections were detected in Cuba, Brazil, Mexico, Egypt, the Republic of South Africa, Nepal, and India.

BrowserVenom malware overview

BrowserVenom has been observed infiltrating systems through a multi-stage chain. In the first stage, users can be presented with a decoy – a fake Cloudflare CAPTCHA test ("I am not a robot"). After its completion, another window is displayed – options for installing the fake DeekSeek together with Ollama or LM studio (both likewise fraudulent offers). Selecting either of the "Install" buttons initiates the next stage, which culminates in the infiltration of BrowserVenom.

This malware has anti-detection capabilities, i.e., it attempts to add itself as an exclusion for the Microsoft Defender Antivirus. The success depends on whether the user has admin privileges on the system.

BrowserVenom functions as proxyware. This malware modifies browsing instances to force the Internet traffic through a proxy controlled by the attackers – thus, they can manipulate the network traffic and collect sensitive data. To elaborate on how BrowserVenom carries out this activity, on Chromium-based browsers – it adds a proxy-server argument and alters existing LNK (Windows shortcut) files, and for Gecko-based browsers – it modifies the user's profile preferences.

BrowserVenom may be used for a variety of nefarious purposes in addition to monitoring browsing activity and gathering associated information. In general, proxyware can be utilized to register numerous social media and other online accounts (for spam, scam, or malware-spreading purposes), to scour highly sensitive websites that host private data (e.g., governmental, judiciary, etc.), sneakily click ads (affiliate scam purposes), visit malware-distributing sites, and so on.

Additionally, BrowserVenom has the ability to download content (like binaries) from the Web. Hence, this malicious software may cause further system infections. At the time of research, no binary could be downloaded from the hardcoded domain. Yet this could be rectified in potential future releases of this proxyware, which is quite likely since malware developers often improve upon their software and methodologies.

To summarize, the presence of malware like BrowserVenom on devices can lead to multiple system infections, severe privacy issues, financial losses, and identity theft.

Malware in general

Malware is a broad term covering programs with a variety of malicious functionalities. Some prevalent types include loaders that cause chain infections, stealers that extract/exfiltrate data, ransomware that encrypts files to demand ransoms for their decryption, and many, many others.

Furthermore, malware is not limited to its classification, i.e., it may possess various differing capabilities. What is more, malware infections can be complex and involve multiple malicious programs.

We have written thousands of articles on malware; Dispout, Taskbarify, Viewndown – are some of our newest on programs with proxyware abilities, TetraLoader, NETXLOADER, TransferLoader – on loaders, EDDIESTEALER, Octalyn, Katz – on stealers, and Puld, Backups, SafeLocker – on ransomware.

It must be emphasized that regardless of how malware operates – its presence on a system endangers device and user safety. Therefore, all threats must be removed immediately upon detection.

How did BrowserVenom infiltrate my computer?

BrowserVenom has been distributed under the guise of the DeepSeek application. The malicious webpage spreading this malware as the DeepSeek-R1 LLM environment installer imitated the official DeepSeek website. This fake page was endorsed by abusing Google Ads to display it as the topmost result on search engines (malvertising).

It is pertinent to mention that older campaigns proliferating other malware with a DeepSeek disguise have been promoted via social media spam on X (more commonly referred to by its former name – Twitter).

Other distribution techniques are possible. Generally, malware is spread by relying on phishing and social engineering tactics. Malicious programs are often disguised as or bundled with genuine or legitimate-sounding software/media.

Infectious files can be archives (RAR, ZIP, etc.), executables (.exe, .run, etc.), documents (Microsoft Office, Microsoft OneNote, PDF, etc.), JavaScript, and so forth. Merely opening a malicious file can be enough to trigger the infection chain.

The most prevalent distribution methods include: malvertising, attachments/links in spam (e.g., emails, PMs/DMs, social media posts, etc.), online scams, trojans (backdoors/loaders), drive-by (stealthy/deceptive) downloads, suspicious download sources (e.g., freeware and third-party sites, P2P sharing networks, etc.), pirated content, illegal software activation tools ("cracks"), and fake updates.

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

How to avoid installation of malware?

Caution is critical to ensuring device integrity and user safety. Therefore, always be vigilant when browsing, as the Internet is full of deceptive and malicious content. Treat incoming emails and other messages with care. Do not open attachments or links found in dubious/irrelevant mail, as they can be virulent.

Additionally, download only from official and trustworthy channels. Activate and update software using functions/tools provided by legitimate developers, as those obtained from third-parties can contain malware.

It is paramount to have a reputable antivirus installed and kept updated. Security software must be used to run regular system scans and to remove detected 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.

Screenshot of the fake DeepSeek website distributing BrowserVenom (image source – Securelist):

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

Malware removal rarely requires such drastic measures.

What are the biggest issues that BrowserVenom malware can cause?

The dangers posed by an infection differ depending on the malware's functionalities and the cyber criminals' goals. BrowserVenom works as proxyware and may infiltrate additional malicious content into systems. Generally, the presence of such malicious software can result in multiple system infections, serious privacy issues, financial losses, and identity theft.

What is the purpose of BrowserVenom malware?

Cyber criminals mainly use malware to generate revenue. However, attackers may also use malicious programs to amuse themselves, carry out personal vendettas, disrupt processes (e.g., websites, services, etc.), engage in hacktivism, and launch politically/geopolitically motivated attacks.

How did BrowserVenom malware infiltrate my computer?

BrowserVenom has been spread through fake DeepSeek installers distributed by sites imitating the official website, which were promoted via malvertising. Other disguises or distribution techniques are not unlikely.

Generally, malware is proliferated through drive-by downloads, online scams, spam, trojans, dubious download channels (e.g., freeware and third-party sites, P2P sharing networks, etc.), pirated programs/media, illegal software activation tools ("cracks"), and fake updates. Furthermore, some malicious programs can self-spread via local networks and removable storage devices (e.g., external hard drives, USB flash drives, etc.).

Will Combo Cleaner protect me from malware?

Combo Cleaner is designed to scan devices and remove all kinds of threats. It is capable of detecting and eliminating most of the known malware infections. Remember that performing a complete system scan is crucial since high-end malicious software typically hides deep within systems.