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Fake error popups are spreading malware fast

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Fake error popups are spreading malware fast

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A dangerous cybercrime tool has surfaced in underground forums, making it far easier for attackers to spread malware. 

Instead of relying on hidden downloads, this tool pushes fake error messages that pressure you into fixing problems that never existed. Security researchers say this method is spreading quickly because it feels legitimate. The page looks broken. The warning feels urgent. The fix sounds simple. 

That combination is proving alarmingly effective for cybercriminals.

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How fake error malware attacks actually work

These attacks begin with a compromised website. When a visitor lands on the page, something looks wrong right away. Text appears broken. Fonts look scrambled. Visual elements seem corrupted. A pop-up then appears claiming the issue can be fixed with a browser update or a missing system font. A button offers to repair the problem instantly. 

Clicking that button copies a command to the clipboard and displays instructions to paste it into PowerShell or a system terminal. That single step launches the infection.

MALICIOUS CHROME EXTENSIONS CAUGHT STEALING SENSITIVE DATA

Fake error popups make a website look broken by scrambling text or fonts to create urgency and panic. (Jens Büttner/picture alliance via Getty Images)

Why this new tool changes the threat landscape

The tool behind these attacks is called ErrTraffic. It automates the entire process and removes the technical barriers that once limited cybercrime operations. For about $800, attackers get a full package with a control panel and scripted payload delivery. Analysts at the Hudson Rock Threat Intelligence Team identified the tool after tracking its promotion on Russian-language forums in early December 2025. 

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ErrTraffic works through a simple JavaScript injection. A single line of code connects a hacked site to the attacker’s dashboard. From there, everything adapts automatically. The script detects the operating system and browser. It then displays a customized fake error message in the correct language. The attack works across Windows, Android, macOS and Linux.

MOST PARKED DOMAINS NOW PUSH SCAMS AND MALWARE

The popups often claim a browser update or missing system font is needed to fix the problem. (Daniel Acker/Bloomberg via Getty Images)

Why security software struggles to stop it

Traditional malware defenses look for suspicious downloads or unauthorized installations. ErrTraffic avoids both. Browsers see normal text copying. Security tools see a legitimate system utility being opened manually. Nothing appears out of place. That design allows the attack to slip through protections that would normally stop malware in its tracks.

The success rate is deeply concerning

Data pulled from active ErrTraffic campaigns shows conversion rates approaching 60%. That means more than half of the visitors who see the fake error message follow the instructions and install malware. Once active, the tool can deliver infostealers like Lumma or Vidar on Windows devices. Android targets often receive banking trojans instead. The control panel even includes geographic filtering, with built-in blocks for Russia and neighboring regions to avoid drawing attention from local authorities.

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What happens after infection?

Once malware is installed, credentials and session data are stolen. Those compromised logins are then used to breach additional websites. Each newly hacked site becomes another delivery vehicle for the same attack. That cycle allows the campaign to grow without direct involvement from the original operator.

FAKE WINDOWS UPDATE PUSHES MALWARE IN NEW CLICKFIX ATTACK

Following the on-screen instructions can quietly trigger malware that steals passwords and personal data. (Kurt Knutsson)

Ways to stay safe from fake error malware

A few smart habits can significantly reduce risk when facing fake error pop-ups and browser-based traps.

1) Never run commands suggested by a website

Legitimate websites never ask you to copy and paste commands into PowerShell or a system terminal. Fake error malware relies on convincing messages that pressure you into doing exactly that. If a page instructs you to run code to fix a problem, close it immediately.

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2) Close pages that claim your system is corrupted

Fake error campaigns often use broken text, scrambled fonts or warnings about missing files to grab attention. As a result, these visuals create urgency and trigger fear. In reality, a real system problem never announces itself through a random website, so close the page right away.

3) Install updates only through official system settings

Real browser and operating system updates come from built-in update tools, not pop-ups on websites. If an update is needed, your device will notify you directly through system settings or trusted app stores.

4) Install strong antivirus software on every device

Strong antivirus software can help block malicious scripts, detect infostealers and stop suspicious behavior before damage spreads. This is especially important since fake error malware targets Windows, Android, macOS and Linux systems.

The best way to safeguard yourself from malicious links that install malware, potentially accessing your private information, is to have strong antivirus software installed on all your devices. This protection can also alert you to phishing emails and ransomware scams, keeping your personal information and digital assets safe.

Get my picks for the best 2025 antivirus protection winners for your Windows, Mac, Android and iOS devices at Cyberguy.com.

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5) Use a data removal service to reduce exposure

Stolen credentials fuel the spread of fake error malware. Removing personal information from data broker sites can reduce the impact if login details are compromised and limit how far an attack can spread.

While no service can guarantee the complete removal of your data from the internet, a data removal service is really a smart choice. They aren’t cheap, and neither is your privacy. These services do all the work for you by actively monitoring and systematically erasing your personal information from hundreds of websites. It’s what gives me peace of mind and has proven to be the most effective way to erase your personal data from the internet. By limiting the information available, you reduce the risk of scammers cross-referencing data from breaches with information they might find on the dark web, making it harder for them to target you.

Check out my top picks for data removal services and get a free scan to find out if your personal information is already out on the web by visiting Cyberguy.com.

Get a free scan to find out if your personal information is already out on the web: Cyberguy.com.

6) Treat font and browser update pop-ups with suspicion

Claims about missing fonts or outdated browsers are a hallmark of these attacks. Modern systems manage fonts automatically, and browsers update themselves. A webpage has no reason to request manual fixes.

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If a real update is needed, the operating system will request it directly. A random webpage never should.

Kurt’s key takeaways 

Fake error malware works because it plays on a very human reaction. When something on a screen suddenly looks broken, most people want to fix it fast and move on. That split-second decision is exactly what attackers are counting on. Tools like ErrTraffic show how polished these scams have become. The messages look professional. The instructions feel routine. Nothing about the moment screams danger. But behind the scenes, one click can quietly hand over passwords, banking access and personal data. The good news is that slowing down makes a real difference. Closing a suspicious page and trusting built-in system updates can stop these attacks cold. When it comes to pop-ups claiming your device is broken, walking away is often the smartest fix.

Have you ever seen a pop-up or error message that made you stop and wonder if it was real? Tell us what it looked like and how you handled it by writing to us at Cyberguy.com.

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Copyright 2025 CyberGuy.com. All rights reserved.

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Technology

X claims it has stopped Grok from undressing people, but of course it hasn’t

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X claims it has stopped Grok from undressing people, but of course it hasn’t

Updates to [@]Grok Account

We have implemented technological measures to prevent the Grok account from allowing the editing of images of real people in revealing clothing such as bikinis. This restriction applies to all users, including paid subscribers.

Additionally, image creation and the ability to edit images via the Grok account on the X platform are now only available to paid subscribers. This adds an extra layer of protection by helping to ensure that individuals who attempt to abuse the Grok account to violate the law or our policies can be held accountable.

Geoblock update

We now geoblock the ability of all users to generate images of real people in bikinis, underwear, and similar attire via the Grok account and in Grok in X in those jurisdictions where it’s illegal.

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Malicious Mac extensions steal crypto wallets and passwords

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Malicious Mac extensions steal crypto wallets and passwords

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Mac users often assume they’re safer than everyone else, especially when they stick to official app stores and trusted tools.

That sense of security is exactly what attackers like to exploit. Security researchers have now uncovered a fresh wave of malicious Mac extensions that don’t just spy on you, but can also steal cryptocurrency wallet data, passwords and even Keychain credentials. What makes this campaign especially concerning is where the malware was found, inside legitimate extension marketplaces that many people trust by default.

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Once active, GlassWorm targets passwords, crypto wallets, and even your macOS Keychain without obvious warning signs. (Cyberguy.com)

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How malicious Mac extensions slipped into trusted stores

Security researchers at Koi Security uncovered a new wave of the GlassWorm malware hiding inside extensions for code editors like Visual Studio Code (via Bleeping Computer). If you’re not familiar with code editors, they’re tools developers use to write and edit code, similar to how you might use Google Docs or Microsoft Word to edit text. These malicious extensions appeared on both the Microsoft Visual Studio Marketplace and OpenVSX, platforms widely used by developers and power users.

FAKE AI CHAT RESULTS ARE SPREADING DANGEROUS MAC MALWARE

At first glance, the extensions looked harmless. They promised popular features like code formatting, themes or productivity tools. Once installed, though, they quietly ran malicious code in the background. Earlier versions of GlassWorm relied on hidden text tricks to stay invisible. The latest wave goes further by encrypting its malicious code and delaying execution, making it harder for automated security checks to catch.

Even though this campaign is described as targeting developers, you don’t need to write code to be at risk. If you use a Mac, install extensions or store passwords or cryptocurrency on your system, this threat still applies to you.

What GlassWorm does once it’s on your Mac

Once active, GlassWorm goes after some of the most sensitive data on your device. It attempts to steal login credentials tied to platforms like GitHub and npm, but it doesn’t stop there. The malware also targets browser-based cryptocurrency wallets and now tries to access your macOS Keychain, where many saved passwords are stored.

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Researchers also found that GlassWorm checks whether hardware wallet apps like Ledger Live or Trezor Suite are installed. If they are, the malware attempts to replace them with a compromised version designed to steal crypto. That part of the attack isn’t fully working yet, but the functionality is already in place.

To maintain access, the malware sets itself up to run automatically after a reboot. It can also allow remote access to your system and route internet traffic through your Mac without you realizing it, turning your device into a quiet relay for someone else.

Some of the malicious extensions showed tens of thousands of downloads. Those numbers can be manipulated, but they still create a false sense of trust that makes people more likely to install them.

7 steps you can take to stay safe from malicious Mac extensions

Malicious extensions don’t look dangerous. That’s what makes them effective. These steps can help you reduce the risk, even when threats slip into trusted marketplaces.

1) Only install extensions you actually need

Every extension you install increases risk. If you’re not actively using one, remove it. Be especially cautious of extensions that promise big productivity gains, premium features for free or imitate popular tools with slightly altered names.

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2) Verify the publisher before installing anything

Check who made the extension. Established developers usually have a clear website, documentation and update history. New publishers, vague descriptions or cloned names should raise red flags.

These malicious extensions looked like helpful tools but quietly ran hidden code once installed. (Cyberguy.com)

3) Use a password manager

A password manager keeps your logins encrypted and stored safely outside your browser or editor. It also ensures every account has a unique password, so if one set of credentials is stolen, attackers can’t reuse it elsewhere.

Next, see if your email has been exposed in past breaches. Our No. 1 password manager pick includes a built-in breach scanner that checks whether your email address or passwords have appeared in known leaks. If you discover a match, immediately change any reused passwords and secure those accounts with new, unique credentials.

Check out the best expert-reviewed password managers of 2026 at Cyberguy.com.

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HOW HACKERS ARE BREAKING INTO APPLE DEVICES THROUGH AIRPLAY

4) Run strong antivirus software on your Mac

Modern macOS malware doesn’t always drop obvious files. Antivirus tools today focus on behavior, looking for suspicious background activity, encrypted payloads and persistence mechanisms used by malicious extensions. This adds a critical safety net when something slips through official marketplaces.

The best way to safeguard yourself from malicious links that install malware, potentially accessing your private information, is to have strong antivirus software installed on all your devices. This protection can also alert you to phishing emails and ransomware scams, keeping your personal information and digital assets safe.

Get my picks for the best 2026 antivirus protection winners for your Windows, Mac, Android and iOS devices at Cyberguy.com.

5) Consider a personal data removal service

When your data leaks, it often spreads across data broker sites and breaches databases. Personal data removal services help reduce how much of your information is publicly available, making it harder for attackers to target you with follow-up scams or account takeovers.

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While no service can guarantee the complete removal of your data from the internet, a data removal service is really a smart choice. They aren’t cheap, and neither is your privacy. These services do all the work for you by actively monitoring and systematically erasing your personal information from hundreds of websites. It’s what gives me peace of mind and has proven to be the most effective way to erase your personal data from the internet. By limiting the information available, you reduce the risk of scammers cross-referencing data from breaches with information they might find on the dark web, making it harder for them to target you.

Check out my top picks for data removal services and get a free scan to find out if your personal information is already out on the web by visiting Cyberguy.com.

Get a free scan to find out if your personal information is already out on the web: Cyberguy.com.

6) Turn on two-factor authentication (2FA)

Enable 2FA wherever possible, especially for email, cloud services, developer platforms and crypto-related accounts. Even if a password is stolen, 2FA can stop attackers from logging in.

7) Keep macOS and your apps fully updated

Security updates close gaps that malware relies on. Turn on automatic updates so you’re protected even if you miss the headlines or forget to check manually.

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Mac users often trust official app stores, but that trust is exactly what attackers are counting on. (Kurt “CyberGuy” Knutsson)

Kurt’s key takeaway

GlassWorm shows that malware doesn’t always come from shady downloads or obvious scams. Sometimes it hides inside tools you already trust. Even official extension stores can host malicious software long enough to cause real harm. If you use a Mac and rely on extensions, a quick review of what’s installed could save you from losing passwords, crypto or access to important accounts.

When was the last time you checked the extensions running on your Mac? Let us know by writing to us at Cyberguy.com.

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Get my best tech tips, urgent security alerts and exclusive deals delivered straight to your inbox. Plus, you’ll get instant access to my Ultimate Scam Survival Guide – free when you join my CYBERGUY.COM newsletter. 

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Copyright 2026 CyberGuy.com. All rights reserved. 

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BMW says electric M3 will be a ‘new level’ of performance

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BMW says electric M3 will be a ‘new level’ of performance

BMW teased its forthcoming all-electric M-series performance sedan today, promising that the quad-motor M3 sports car would feature specs that are truly next level when it arrives in 2027.

The M3 will have four electric motors and simulated gear shifting, a feature that is quickly becoming a must-have for electrified sports cars. BMW says the setup unlocks the benefits of both rear and all-wheel drive, with the ability to decouple the front axle.

The electric M3 will also be built on BMW’s Neue Klasse platform that promises more efficient batteries, lightning fast charging, and higher powered computers. The architecture will be 800-volt, the regenerative braking will be highly efficient, and if the camouflaged pictures are any indication, it will be a real looker on the streets.

Speaking of computers, the M3 will have four of them, unified under its oddly named “Heart of Joy” component that aggregates all the traction, stability, and electric motor management functions of the vehicle. That means when software updates are made available, the vehicle’s brain will be able to receive them over-the-air faster than BMW’s current processors.

The M3’s simulated gear shifting will feature a “newly developed soundscape” that “channels pure emotion.” Like other automakers, BMW is loath to alienate its loyal M-series customers by giving them all the torque but none of the gearing feedback. And now a fake “soundscape” will accompany all that shifting. Porsche, Hyundai, and Dodge are also on board the fake EV gear shifting bandwagon.

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