Defense-software.com ads: what it is and how to remove it
Defense-software.com is one of many deceitful and fake websites that attempt to trick users into taking actions they wouldn't otherwise. Defense-software.com only copies well-known logos and other characteristics to lure users into downloading and installing software, which increases the scammers' profits.
Facts checked October 7, 2026. Removal steps tested on Windows 11 (26H2) and checked against Microsoft's and the browser makers' current documentation. Sections marked as our earlier report are the original text: they describe the threat as it was then and have not been reviewed since. The 2026 status, the removal steps and the questions are current.
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Defense-software.com ads: summary
| Name | Defense-software.com |
|---|---|
| Type | Scam, ads, redirect |
| Infiltration | Compromised websites, pop-up ads, potentially unwanted applications |
| Scam content | Claims that the subscription for security software has expired and that it needs to be immediately renewed to remove the allegedly found threats. Asks to download software and enable push notifications |
| Dangers | Crooks attempt to make people provide their personal information, download potentially malicious software, or make them subscribe to useless services |
| Detection names | No Microsoft detection name is known |
| Removal | Scan the PC with security software to find and remove the malware and anything installed with it. Fortect scans Windows for malware and repairs the system files and settings it damaged. Remove it nowTo use the full-featured product, you have to purchase a license for Fortect. The scan is free. |
Show 10 more facts
| Distribution | Not recorded in the old report |
|---|---|
| Damage | Not recorded in the old report |
| Symptoms | Notification spam from a website |
| Evidence | 4 write-ups by security sites; details still limited |
| Domains | defense-software.com |
| Ads shown as | Desktop notifications |
| Browsers | Chrome, Edge and Firefox |
| Installed on the PC | Nothing; a browser notification permission only |
| First seen | 19 October 2022 |
| Facts checked | 7 October 2026 |
Is Defense-software.com ads dangerous?
From our report of Oct 2022 · not reviewed since
Defense-software.com ads show fake malware infection alerts to make them click links and purchase software
Defense-software.com is one of many deceitful and fake websites that attempt to trick users into taking actions they wouldn't otherwise.
Defense-software.com only copies well-known logos and other characteristics to lure users into downloading and installing software, which increases the scammers' profits. Besides, you might never know where you may be led - you may be coerced into installing a fake version of the security app
Although it may be alarming to find this message, there is no need to worry. There are ways you can check your system for infections without interacting with this site.
If you frequently encounter phishing, spoofing, and other scam websites, you will likely have adware or other unwanted software on your device, though. We will explain how to confirm whether this is the case and provide removal instructions for those affected.

From our report of Oct 2022 · not reviewed since
The ploy of scammers explained
Defense-software.com is a fake virus scam - a form of online fraud that has been extremely prevalent because it is very effective.
In recent years, we have seen an incredible rise in fake websites that attempt to imitate legitimate security vendors. Protectionsurveys.online, Posto.click, and Defenderfocus.xyz, for example, operate identically, using the same fake scan elements and names of security vendors, showing identical results.
Cybersecurity social engineering ploys like using well-known names are also nothing new. It gives individuals a reason to accept these scam tricks as authentic, giving them a sense of legitimacy. Hence, victims are more likely to trust results coming from somebody they know is reputable in cybersecurity.
Those who get frightened by claims that their systems are infected are more likely to be inclined to take actions that would take them out of this seemingly dangerous situation, which would make them proceed with the given instructions of recovery.
In this scenario, regardless of whether visitors were tricked into going there by a fake ad, they are likely to be redirected to a purchase page of a security firm they attempted to impersonate before recovering the affiliate link income.
It should go without saying that attempts at such illegal monetization should not be rewarded. Another reason not to proceed is that individuals can be routed to websites that advertise malware that poses as legitimate products or rogue security software.

From our report of Oct 2022 · not reviewed since
Check your device for adware
The first thing you should do after visiting a fraudulent website such as Defense-software.com is to run a virus scan.
Use or security software to efficiently and quickly remove all malicious components from the system, which is the easiest way to ensure that your PC is clear of adware or malware.
Manual removal could be time-consuming and challenging. Unwanted applications can be automatically deleted, saving you valuable time. Additionally, it's likely that removing helpful applications will have a negative impact.
Furthermore, you should remove all cookies and other trackers from your browsers as soon as you can after making sure your computer is free of malware and adware. Use to complete this task, or carry it out by using the methods listed below:
MS Edge (Chromium)
- Click on Menu and pick Settings.
- Under Privacy and security, select Clear browsing data.
- Select Browsing history, Cookies and other site data, as well as Cached images and files.
- Click Clear data.
- Click Menu and pick Options.
- Go to Privacy & Security section.
- Click on Clear Data...
- Select Cookies and Site Data, as well as Cached Web Content, and press Clear.
- Click on Menu and go to Settings.
- Select Privacy and services.
- Under Clear browsing data, pick Choose what to clear.
- Under Time range, pick All time.
- Select Clear now.
- Click Safari > Clear History...
- From the drop-down menu under Clear, pick all history.
- Confirm with Clear History.
From our report of Oct 2022 · not reviewed since
Disable push notifications
Defense-software.com asks visitors whether they want to enable push notifications when they first visit.
If you accept this proposition either intentionally or accidentally, you can start getting intrusive pop-up windows that appear on your desktop at various intervals. You shouldn't engage with these push notifications in any way because they frequently contain deceptive or malicious links that lead to risky websites.
MS Edge (Chromium)
- Open the Google Chrome browser and go to Menu > Settings.
- Locate the Privacy and security section and pick Site Settings > Notifications.
- Look at the Allow section and look for a suspicious URL.
- Click the three vertical dots next to it and pick Block. This should remove unwanted notifications from Google Chrome.
- Open Mozilla Firefox and go to Menu > Options.
- Click on Privacy & Security section.
- Under Permissions, you should be able to see Notifications. Click the Settings button next to it.
- In the Settings – Notification Permissions window, click on the URL's drop-down menu.
- Select Block and then click on Save Changes. This should remove unwanted notifications from Mozilla Firefox.
- Open Microsoft Edge, and go to Settings.
- Select Site permissions.
- Go to Notifications on the right.
- Under Allow, you will find the unwanted entry.
- Click on More actions and select Block.
- Click on Safari > Preferences...
- Go to the Websites tab and, under General, select Notifications.
- Select the web address in question, click the drop-down menu and select Deny.
From our report of Oct 2022 · not reviewed since
More from our earlier report on Defense-software.com
- The scam's goal is to persuade users that their computers are afflicted by harmful viruses and that the only way to get rid of them is by updating the security software license, which allegedly comes from a prominent anti-malware maker known as McAfee.
- The thing here is that McAfee has nothing to do with this bogus security scan, and your machine is not infected (at least not with what the false site claims).
- If you do not clean your browser from cookies and other web data, you see the unwanted ads return or data continue being tracked.
Check your browser and PC
- Address:
defense-software.com
How to remove Defense-software.com ads
How to stop Defense-software.com notifications
Do this in every browser you use, and in every profile inside it: each keeps its own list of sites allowed to send notifications.
Nothing has to be uninstalled for the notifications themselves.
Which browser shows the ads?
Step 1: Remove defense-software.com from Chrome's notification list
Chrome keeps a list of every site you once allowed to send notifications, and
defense-software.comis on it. Pastechrome://settings/content/notificationsinto the address bar, find defense-software.com under Allowed to send notifications, open the three-dot menu next to it and pick Remove.Then click Add next to Not allowed to send notifications and type defense-software.com, so the site cannot ask a second time. Repeat it in every Chrome profile you use on Windows 11 or Windows 10, since each profile has its own list.

Chrome on Windows 11: Settings > Privacy and security > Site settings > Notifications. Full procedure with screenshots: Stop website notifications and pop-ups
Step 1: Remove defense-software.com from Edge's notification list
Open Settings and more (the three dots) > Settings > Privacy, search, and services > Site permissions > All permissions > Notifications. Remove
defense-software.comfrom the Allowed list, then click Add site next to Not allowed to send notifications and enter it there.Edge is built into both Windows 11 and Windows 10, so check it even if you normally use another browser. If the notifications came with the Edge logo, this is the browser that holds the permission.

Edge on Windows 11: Site permissions > All permissions > Notifications. Full procedure with screenshots: Stop website notifications and pop-ups
Step 1: Remove defense-software.com from Firefox's notification permissions
Open the menu (three lines) > Settings and click Permissions and data in the left list, then Notifications. Select
defense-software.com, click Remove Website and confirm with Save Changes.In versions older than Firefox 152 the same list sits under Privacy & Security, behind a Settings button next to Notifications. Firefox shows these notifications only while it is running, on Windows 11 and Windows 10 alike.

Firefox on Windows 11: the Notification Permissions window. Full procedure with screenshots: Stop website notifications and pop-ups
Then, whichever browser you use
Step 2: Scan the PC if you downloaded anything from the ads
If you only saw the notifications and clicked nothing, you can stop before this step. If a notification led you to download or run something, delete that file, then scan Windows.
In Windows Security > Virus & threat protection > Scan options, run a Full scan, then choose Microsoft Defender Antivirus (offline scan) and Scan now. The offline scan restarts the PC and takes about 15 minutes on Windows 11 and Windows 10.

Windows 11: Windows Security > Virus & threat protection > Scan options. Full procedure with screenshots: Run a Microsoft Defender Offline scan
Choose a proper web browser and improve your safety with a VPN tool
Online spying has got momentum in recent years and people are getting more and more interested in how to protect their privacy online.
One of the basic means to add a layer of security - choose the most private and secure web browser. Although web browsers can't grant full privacy protection and security, some of them are much better at sandboxing, HTTPS upgrading, active content blocking, tracking blocking, phishing protection, and similar privacy-oriented features.
However, if you want true anonymity, we suggest you employ a powerful VPN - it can encrypt all the traffic that comes and goes out of your computer, preventing tracking completely.
Lost your files? Use data recovery software
While some files located on any computer are replaceable or useless, others can be extremely valuable.
Family photos, work documents, school projects - these are types of files that we don't want to lose. Unfortunately, there are many ways how unexpected data loss can occur:
- power cuts
- Blue Screen of Death errors
- hardware failures
- crypto-malware attack
- even accidental deletion
To ensure that all the files remain intact, you should prepare regular data backups. You can choose cloud-based or physical copies you could restore from later in case of a disaster. If your backups were lost as well or you never bothered to prepare any, can be your only hope to retrieve your invaluable files.
Questions about Defense-software.com ads
defense-software.com keeps sending notifications. Is it a virus?
No. Notifications from defense-software.com come from a permission stored in the browser, not from a program installed in Windows. Someone clicked Allow on a prompt from that site, usually without realising what it meant, and the site now sends ads through the browser's notification system.
Antivirus scans often find nothing because there is nothing to find on the disk. Removing defense-software.com from the browser's list of allowed sites stops the messages for good. A scan is still useful if you clicked a notification and downloaded or ran something from the page it opened, because those downloads can be unwanted programs.
Did a notification from defense-software.com infect my computer?
A notification cannot infect a PC. It is a short text with a link that the browser displays. Clicking it opens a page, and a page cannot install anything unless you agree to a download and run the file.
So the answer depends on what you did after clicking. Looked and closed: you are fine. Downloaded but did not open: delete the file.
Opened a downloaded file: uninstall what it added and scan the PC. Typed card or login details: contact the bank and change the password. In every case, remove defense-software.com from the browser's allowed notifications so the messages stop.
Why does Defense-software.com show me ads?
Because that is its whole purpose. Defense-software.com is a push-notification spam site, and its operators are paid for every ad it displays and every click it gets. In this case the ads take the form of desktop notifications.
They are chosen by ad networks that accept almost any advertiser, which is why so many look like warnings or prizes. The ads are not a sign that your PC is broken or infected with something worse; they are a sign that something on it, or in the browser, has permission to advertise. Removing that permission or program stops them.
Is defense-software.com safe to visit?
No. The site defense-software.com exists to push visitors towards ads, and the pages it leads to include fake virus warnings, fake updates, prize scams and notification prompts. Visiting it once does not infect an up-to-date PC, but anything you click or download there is a gamble.
Do not enter personal details, do not allow notifications and do not call phone numbers it shows. If it opens by itself, close the tab and check the browser's extensions and notification permissions. Blocking the single domain helps little, because the operators register new names regularly.
Which browser is sending the defense-software.com notifications?
Each notification shows the name of the browser and the site in its small print. In the cases we saw, the messages from defense-software.com came through Chrome, Edge and Firefox. Permissions are stored per browser and per profile, so removing the site in one browser does not affect another.
If you use several Chrome or Edge profiles, check each one. If you sync the browser with an account, remove the permission while signed in, otherwise another computer may still hold it and keep receiving the same messages.
How do I know the ads come from Defense-software.com?
Look for notifications from defense-software.com. That is the trace Defense-software.com leaves, and it shows up as desktop notifications. Ads that appear on every site, including ones that never carried ads before, point to something on your PC or in the browser rather than to the sites themselves.
A quick test is a private window, where extensions are off by default: if the ads disappear there, an extension is responsible. If they appear even with the browser closed, the source is a notification permission or a program in Windows.
Did clicking Allow install anything on my PC?
No. Allowing notifications stores a permission in the browser and nothing else. No file is downloaded and no program is added to Windows, which is also why antivirus scans find nothing. The risk comes later, from the notifications themselves: they lead to scam pages, fake updates and phishing forms.
Remove the permission in each browser where you allowed it. If you clicked a notification and downloaded something afterwards, delete that file and run a Microsoft Defender full scan and offline scan.
Will Focus or Do not disturb stop the notifications?
Only for as long as it is on. Do not disturb in Windows 11 holds back notifications from all apps, including browsers, and releases them to the notification centre later. The site still has permission and the messages still arrive.
Use the browser's notification settings to remove the site instead: once its permission is gone, it cannot send anything, whatever Windows is set to. Keep Do not disturb for what it is meant for, such as meetings, presentations and quiet hours.
I clicked on one of the ads. Am I infected?
Probably not. Clicking an ad usually only opens a page, and a page cannot install programs on an up-to-date Windows PC without your help.
You are at risk only if you then downloaded and ran a file, allowed notifications, entered card or login details, or called a phone number shown on the page. Delete any download and run a full and offline scan.
Change passwords you typed, from a clean device. Call your bank if you gave card details. If you called a number or allowed remote access, see the next question.
Will Fortect remove Defense-software.com?
No program removes Defense-software.com itself, because there is nothing on the PC to remove: the notifications come through a permission saved in the browser, and only the browser's settings take it away, as the steps above show.
What Fortect can do is check the rest of Windows. Its free scan looks for malware, unwanted programs and damaged system files, which is useful if you clicked the ads, downloaded something from the pages they opened, or are not sure what else changed on the PC.
If the scan finds nothing and the notifications stopped after you removed the permission, this problem is solved. Use Microsoft Defender as a second opinion whenever you have downloaded files from pages like these.
Sources
- Trend Micro: Website spoofing (read October 7, 2026)
- ITgovernance: What is social engineering? (read October 7, 2026)
- Kaspersky: What are Cookies? (read October 7, 2026)
- Google Chrome Help: Use notifications to get alerts (no longer online) (read October 7, 2026)
- FTC: How to recognize, remove and avoid malware (read October 7, 2026)