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Windows PCs at risk as new tool disarms built-in security

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Windows PCs at risk as new tool disarms built-in security

All modern Windows PCs come with Microsoft Defender built in. For the unaware, this tool is Windows’ native antivirus. 

Over time, it has matured into a reliable security tool capable of blocking a wide range of threats. However, a tool called Defendnot can shut down Microsoft Defender completely, without exploiting a bug or using malware. It simply convinces Windows that another antivirus is already running.

The implications are serious. This tool does not break into the system or use advanced code injection. It uses Windows features the way they were designed to be used. And that makes the problem harder to detect and harder to fix.

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Windows software on a PC (Kurt “CyberGuy” Knutsson)

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The tool works by pretending to be an antivirus

Windows is built to avoid running multiple antivirus products at once. When a third-party antivirus registers itself, Windows disables Microsoft Defender to prevent conflicts. Defendnot exploits this system using an undocumented API that security software uses to communicate with the Windows Security Center.

The tool registers a fake antivirus that appears legitimate to the system. It uses a dummy DLL and injects it into Task Manager, a trusted Windows process. By operating inside this signed process, Defendnot avoids signature checks and permission blocks. Once the fake antivirus is registered, Windows disables Microsoft Defender without warning or confirmation.

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No security alert is shown to the user. No visible changes are made to indicate that the system is unprotected. Unless someone checks manually, the machine remains open to attacks with no real-time protection running.

The tool also includes options to set a custom antivirus name, enable logging and configure automatic startup. It achieves persistence by creating a scheduled task that runs whenever the user logs in.

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Windows software on a laptop (Kurt “CyberGuy” Knutsson)

WINDOWS DEFENDER VS ANTIVIRUS SOFTWARE: FREE PROTECTION FALLS SHORT

From GitHub takedown to a fresh build

Defendnot is based on an earlier project called No-Defender. That project used code from an actual antivirus product to fake registration. It gained attention quickly and was removed after a copyright complaint from the vendor whose code had been reused. The developer took the project down and walked away from it.

With Defendnot, the creator rebuilt the core features using original code. This version avoids copyright issues and uses a new method to achieve the same effect. It does not rely on another antivirus or third-party binaries. It was written from scratch to demonstrate how simple it is to manipulate Windows security from inside the system.

Microsoft Defender currently flags the tool as a threat. It detects and quarantines it under the name Win32/Sabsik.FL.!ml. However, the fact that it works at all points to a weakness in how Windows handles antivirus registration and trust.

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Windows laptop showing the home screen (Kurt “CyberGuy” Knutsson)

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6 ways to protect yourself from malicious programs

While Defendnot is a research project, there’s a chance that similar tools are already out there and could be used to compromise your PC. Here are a few tips to help you stay safe:

1. Use strong antivirus software: Even with regular updates, Windows systems can be left exposed by tools like Defendnot that silently disable built-in defenses. A strong third-party antivirus with real-time protection and frequent updates provides essential backup security. Look for solutions with real-time protection and frequent updates to tackle emerging threats. Get my picks for the best 2025 antivirus protection winners for your Windows, Mac, Android and iOS devices.

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2. Limit exposure: Many exploits rely on user interaction, such as clicking a shady link, downloading a compromised file or mounting an untrusted virtual disk. Stick to reputable websites, avoid opening unsolicited email attachments and use a browser with built-in security features (like Microsoft Edge or Chrome with Safe Browsing enabled).

3. Avoid running unexpected commands: Never paste or run commands (like PowerShell scripts) you don’t understand or that were copied from random websites. Attackers often trick users into unknowingly running malware this way.

4. Keep your software updated: Regularly update your operating system, browsers and all software applications. Updates often include patches for security vulnerabilities that malware can exploit.

5. Use two-factor authentication (2FA): Enable 2FA on all your accounts. This adds an extra layer of security by requiring a second form of verification, making it harder for attackers to gain access even if they have your password.

6. Invest in personal data removal services: Even with strong device security, your personal information may still be exposed online through data brokers and people-finder sites. These services collect and publish details like your name, address and phone number, making you an easier target for identity theft or phishing. Automated data removal services track down these sites and submit removal requests on your behalf, helping to reduce your digital footprint and increase your online anonymity. While they can’t erase every trace of your information, they make it significantly harder for attackers to find and exploit your personal data, which saves you time and reduces unwanted spam in the process.

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While no service promises to remove all your data from the internet, having a removal service is great if you want to constantly monitor and automate the process of removing your information from hundreds of sites continuously over a longer period of time. Check out my top picks for data removal services here.

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

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Kurt’s key takeaway

Defendnot points to a bigger issue with how Windows handles security. It takes a feature meant to prevent software conflicts and turns it into a way to completely disable protection. The system assumes any registered antivirus is legitimate, so if attackers can fake that, they get in without much resistance.

We often think of security as blocking the bad and trusting the good. But this case shows what happens when that trust is misplaced. Defendnot doesn’t sneak past Windows defenses. It walks right in using valid credentials. The solution isn’t just more patches or stronger malware signatures. What we need is a smarter way for systems to tell what is actually safe.

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Do you think companies like Microsoft need to rethink how Windows handles antivirus registration and trust, given that tools like Defendnot can so easily disable built-in protections without using malware or exploiting a bug? Let us know by writing us at Cyberguy.com/Contact.

For more of my tech tips and security alerts, subscribe to my free CyberGuy Report Newsletter by heading to Cyberguy.com/Newsletter.

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Even Trump’s chief of staff was ‘aghast’ at Elon Musk’s deadly USAID cuts

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Even Trump’s chief of staff was ‘aghast’ at Elon Musk’s deadly USAID cuts

Wiles says she called Musk on the carpet. “You can’t just lock people out of their offices,” she recalls telling him. At first, Wiles didn’t grasp the effect that slashing USAID programs would have on humanitarian aid. “I didn’t know a lot about the extent of their grant making.” But with immunizations halted in Africa, lives would be lost. Soon she was getting frantic calls from relief agency heads and former government officials with a dire message: Thousands of lives were in the balance.

Wiles continued: “So Marco is on his way to Panama. We call him and say, ‘You’re Senate-confirmed. You’re going to have to be the custodian, essentially, of [USAID].’ ‘Okay,’ he says.” But Musk forged ahead—all throttle, no brake. “Elon’s attitude is you have to get it done fast. If you’re an incrementalist, you just won’t get your rocket to the moon,” Wiles said. “And so with that attitude, you’re going to break some china. But no rational person could think the USAID process was a good one. Nobody.”

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OpenAI announces upgrades for ChatGPT Images with ‘4x faster generation speed’

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OpenAI announces upgrades for ChatGPT Images with ‘4x faster generation speed’

NEWYou can now listen to Fox News articles!

OpenAI announced an update for ChatGPT Images that it says drastically improves both the generation speed and instruction-following capability of its image generator.

A blog post from the company Tuesday says the update will make it much easier to make precise edits to AI-generated images. Previous iterations of the program have struggled to follow instructions and often make unasked-for changes.

“The update includes much stronger instruction following, highly precise editing, and up to 4x faster generation speed, making image creation and iteration much more usable,” the company wrote.

“This marks a shift from novelty image generation to practical, high-fidelity visual creation — turning ChatGPT into a fast, flexible creative studio for everyday edits, expressive transformations, and real-world use.”

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The OpenAI GPT-5 logo appears on a smartphone screen and as a background on a laptop screen in this photo illustration in Athens, Greece. (Nikolas Kokovlis/NurPhoto via Getty Images)

The announcement comes just weeks after OpenAI CEO Sam Altman declared a “code red” in a memo within his company to improve the quality of ChatGPT.

In the document, Altman said OpenAI has more work to do on enhancing the day-to-day experience of its chatbot, such as allowing it to answer a wider range of questions and improving its speed, reliability and personalization features for users, according to The Wall Street Journal.

The reported company-wide memo from Altman comes as competitors have narrowed OpenAI’s lead in the AI race. Google last month released a new version of its Gemini model that surpassed OpenAI on industry benchmark tests.

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The OpenAI logo Feb. 16, 2025 (Reuters/Dado Ruvic)

To focus on the “code red” effort to improve ChatGPT, OpenAI will be pushing back work on other initiatives, such as a personal assistant called Pulse, advertising and AI agents for health and shopping, Altman said in the memo, according to the Journal.

Altman also said the company would have a daily call among those responsible for enhancing ChatGPT, the newspaper added. 

“Our focus now is to keep making ChatGPT more capable, continue growing, and expand access around the world — while making it feel even more intuitive and personal,” Nick Turley, the head of ChatGPT, wrote on X Monday night.

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OpenAI CEO Sam Altman speaks during the Federal Reserve’s Integrated Review of the Capital Framework for Large Banks Conference in Washington, D.C., July 22, 2025.  (Reuters/Ken Cedeno)

        

OpenAI currently isn’t profitable and has to raise funding to survive compared to competitors like Google, which can fund investments in their AI ventures through revenue, the Journal reported.

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I’ve been waiting years for Animal Crossing’s best new features

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I’ve been waiting years for Animal Crossing’s best new features

I never felt done with my Animal Crossing: New Horizons island. Despite playing every day for two years, and racking up 1,700 hours of playtime, I somehow never finished decorating. I had plenty of ideas for my island, sure, but actually implementing them was another story: The decorating and terraforming systems that helped make New Horizons a huge success are also slow, manual, and cumbersome, and my patience for decorating and redecorating had finally worn thin.

Fast-forward a few years, and a very much unexpected update is coming to finally fix some of those pain points. Update 3.0 is launching on January 15th, 2026, alongside the Switch 2 Edition of New Horizons. And while the paid Switch 2 upgrade has some nice-to-haves (like Joy-Con 2 mouse controls for indoor decorating), it’s the free update that brings all the key new features.

I recently attended a virtual preview for the New Horizons upgrade and update, and there are two caveats: I have not yet played either the Switch 2 version or the new free content myself, and it’s hard to gauge the quality of the Switch 2 version’s visual and performance improvements over a Zoom call. (I still have some unanswered questions about the biggest performance issues on the original Switch, like the choppy frame rate on more densely decorated islands.) But seeing the 3.0 additions in action, it was easy to imagine myself finishing my island — or at least an island.

As shown in the October announcement trailer, update 3.0 makes much-needed quality-of-life fixes. You’ll finally be able to craft multiple items at once, and crafting will pull materials from your overall storage instead of your pockets, meaning you won’t have to do a bunch of inventory management just to craft some decor. Then there’s Resetti’s Reset Service, which can help you clean up entire sections of your island instantly so you don’t have to pick everything up individually in order to redecorate. Some players also noticed a very subtle but potentially impactful change to movement while terraforming that should hopefully make it a smoother process. And then, as if to show off those decorating improvements, Nintendo also added Slumber Islands.

Not to be confused with dreams, New Horizons’ online island-sharing feature, Slumber Islands are extra sandboxes for you to decorate and play with, where you can set the time of day and the weather and magically conjure up any item you have in your in-game catalog to decorate with, similar to the Happy Home Paradise DLC. You can build bridges and inclines instantly by talking to Lloid, rather than going through Tom Nook and waiting (or time traveling) a day. And while it seems like terraforming works the same on Slumber Islands, the apparent addition of strafing while terraforming — instead of having to constantly reorient yourself manually — should help at least a little bit. (It’s the first thing I’m going to test on January 15th, that’s for sure.)

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For me, the worst part of decorating in New Horizons was having an idea, ordering all the furniture I’d need for it over the course of days, testing out the design, realizing it did not look the way I envisioned, and facing the tedious process of breaking it all down and starting over again brick by brick — or, at the very least, having to push and pull objects around for a while to see if I could make it work. The design process I saw on Nintendo’s Slumber Island during the preview, meanwhile, seemed quicker and smoother. Trying out an idea or aesthetic in that environment doesn’t sound like such a tall order.

Without any hands-on time, I can’t say if it will actually be noticeably easier to design and decorate with the 3.0 update. But I’m excited by the idea that I can go to my Slumber Island scratch pad and try out my designs before committing to them (and the cost in bells to get it all done) on my main island. And maybe, if I really like how it feels to decorate, I’ll make an entire Halloween-themed Slumber Island — the kind of island I’ve wanted to make for years but never did on my main island, where the seasons continue to change and actively ruin the vibe.

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