Remove Knownwarn pop-up ads (Virus Removal Guide)

Knownwarn.com is a site that tries to force you into clik to its browser notifications so that it can send pop-up window to your computer or phone.

What is Knownwarn.com?

Knownwarn.com is a malicious site that displays fake messages to trick you into subscribing to its browser notifications. These are a few of the fake error messages that the Knownwarn.com will show to trick you into clicking the “Allow” button:

To access to the video, click "Allow"

Click "Allow", to watch the video

Click "ALLOW" to play the video
Stream and download available

Can't play this video! Browser may block video
autoplay... Click "Allow" to play the video

Download is ready. Click Allow to download your file
Press Allow to verify that you are not a robot

You should not click on the “Allow” button when you see such messages. If you click on the “Allow” button, you will start seeing spam pop-ups from Knownwarn.com on your computer or phone, even when the browser is closed. The Knownwarn.com spam notification are for 18+ sites, fake software updates, unwanted programs and etc.

Why am I seeing the Knownwarn.com pop-up ads?

You are seeing the Knownwarn.com pop-ups because your PC is infected with a malware or a site that you have just visited has redirected you to this domain.

Questionable sites can display malicious banners that redirect your browser to Knownwarn.com to generate advertising revenue. If this happens, you can close the page and install a free browser extension like Adblock to block the ads. However, if you continuously see pop-ups from Knownwarn.com, then your computer might be infected with a computer virus, and we will need to scan your PC for malware and remove it.

Here are a few typical signs that you have a infected computer:

• Advertisements appear in places they shouldn’t be;
• Your browser’s homepage has changed without your permission;
• Your browser redirect to questionable sites different from what you expected;
• Web pages that you typically visit are not displaying properly;
• Browser pop-ups appear which recommend fake updates or other software;
• Other unwanted programs might get installed without your knowledge;

To check your computer for the Knownwarn.com adware and remove it, please use the guide.

Remove Knownwarn.com Automatically:

The easiest method to stop Knownwarn.com ads is to run an anti-malware program capable of detecting adware in general and Knownwarn.com in particular. You may try GridinSoft Anti-Malware. It’s good at detecting and removing adware and other PUPs (potentially unwanted programs).

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Other software that may be able to get rid of Knownwarn.com:

• Trojan Killer (Windows)
• Loaris Trojan Remover (Windows)
• Trojan Scanner (Android)

Note: After removing the adware you might still need to disable Knownwarn.com notifications manually (see the step named Delete Knownwarn.com Notifications).

You can also try to remove Knownwarn.com by hand using the following instructions.

Remove Knownwarn.com From Programs and Features:

Windows XP:

1. Click Start.
2. In the Start menu select Settings => Control Panel.
3. Find and click Add or Remove Programs.
4. Select the program.
5. Click Remove.

Windows Vista:

1. Click Start.
2. In the Start menu select Control Panel.
3. Find and click Uninstall a program.
4. Select the program.
5. Click Uninstall.

Windows 7:

1. Click Start.
2. In the Start menu select Control Panel.
3. Find and select Programs and Features or Uninstall a program.
4. Select the program.
5. Click Uninstall.

Windows 8 / Windows 8.1:

1. Press and hold Windows key and hit X key.
2. Select Programs and Features from the menu.
3. Select the program.
4. Click Uninstall.

Windows 10:

1. Press and hold Windows key and hit X key.
2. Select Programs and Features from the menu.
3. Select the program.
4. Click Uninstall.

Delete Adware App From File Explorer:

Remove Knownwarn.com From Browsers:

Remove Knownwarn.com from Google Chrome:

1. Click on three dots menu button at the top right corner of the window.
2. Select More tools ⇒ Extensions.
3. Click REMOVE to uninstall an extension.
4. Click Remove in the dialog box.

Remove Knownwarn.com from Mozilla Firefox:

1. Click on menu button and select Add-ons.
2. Go to Extensions tab.
3. To uninstall an add-on, click on Remove button next to it.

Remove Knownwarn.com from Internet Explorer:

1. Click Tools button in the top-right corner.
2. Select Manage add-ons.
3. In the drop-down menu under Show: select All add-ons.
4. To delete an add-on, double-click it; in the new window click Remove.

Remove Knownwarn.com from Opera:

1. Press Ctrl +Shift + E keys to open extensions manager.
2. To remove an add-on, click on the x button next to it.
3. Click OK when asked to confirm.

Remove Knownwarn.com from Safari:

1. On the top menu select Safari => Preferences.
2. Select Extensions tab.
3. Select an extension you want to delete and click Uninstall button next to it.

Delete Knownwarn.com Notifications:

Remove Knownwarn.com Notifications From Google Chrome:

1. Open chrome://settings/content/notifications (just copy this and paste into the address bar of Chrome).
2. Delete all rogue notifications by clicking three vertical dots button next to each and selecting Remove.

Remove Knownwarn.com Notifications From Mozilla Firefox:

1. Click on menu button and select Options.
2. Select Privacy & Security on the left side of the window.
3. Scroll down to Permissions section and click Settings… button next to Notifications.
4. Find sites you down’t want to see notifications from, click on drop-down menu next to each and select Block.
5. Click Save Changes button.

Get rid of Knownwarn.com pop-ups and notifications on Android:

Disable Knownwarn.com notifications:

Note: Steps might differ a little depending on the version of your Android.

1. Tap Settings.
2. Select Apps & notifications => Apps.
3. Find and tap the browser that displays Knownwarn.com notifications.
4. Tap Notifications.
5. Find Knownwarn.com in the list and disable it.

Stop Knownwarn.com redirects:

If Knownwarn.com is opening up on new tabs in your browser every now and then, that indicates you have adware. Probably one on the apps you installed lately is triggering these pop-ups. Uninstall recenly installed and questionable apps you have. Alternatively, usage Loaris Trojan Remover or one more anti-malware tools to check your device for malware.

Pop-ups and ads on Android may also not be caused by anything set up however originated from sites instead. To get rid of those ads, you can utilize an Trojan Scanner: