Mac Virus

Remove “This Mac Is Not Secure” (Dec. 2018 Update)

Parasite may reinstall itself multiple times if you don't delete its core files. We recommend downloading ComboCleaner to scan for malicious programs installed with it. This may save you hours and cut down your time to about 15 minutes. 

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More information about ComboCleaner and steps to uninstall. Please review ComboCleaner's EULA and Privacy Policy. Keep in mind, only ComboCleaner’s scanner is free. If it detects a malware, you'll need to purchase its full version to remove it.

“This Mac Is Not Secure”

Browser hijacker applications are similar to an extension that you can add to your browser but there is one main difference between the two and this is the fact that a hijacker will most likely reduce the quality of your online experience rather than increase it. The most common complaints that users have with those so-called browser hijacker apps is that they tend to spam popular browser like Safari, Chrome and Firefox with endless streams of obstructive advertisements and even page-redirects to different sites and pages that mostly contain promotional content. In addition to that, it is typical for a hijacker to make changes to the starting page address or to the search engine tool of the browser it has gotten installed on, normally without requiring the direct approval of the computer Admin. All of this could, naturally, frustrate most of the users and make them wish they could remove the nagging app. This is where the second major problem with hijackers is – they tend to be quite difficult and tricky to uninstall, especially for someone who has never dealt with this type of software before.

“This Mac Is Not Secure” Pop up

The good news that we can give you here, however, is that if you are one of the many users who are currently struggling with such software on their computer, you can find help with the removal of the hijacker within the next lines. Since “This Mac Is Not Secure” is one of the most recent and most annoying hijackers that we know of, this is the one we are going to be focusing on in our removal guide that you can read below. Therefore, if you are currently getting irritated by the pesky “This Mac Is Not Secure”, be sure to take a look at the removal instructions below and use them and/or the recommended anti-malware tool in order to get rid of the annoying software once and for all.

More facts about hijackers

Some users tend to panic at the sight of the random ads, redirects and changes that the hijacker has introduced to their browsers, thinking that their machine has been infiltrated by some highly dangerous piece of malware like a Trojan Horse or a Ransomware cryptovirus. “This Mac Is Not Secure”, however, is nowhere near as problematic as a malware program of the Ransomware or the Trojan Horse category or of any other malicious category of software viruses. Browser hijackers like “This Mac Is Not Secure” are mainly developed to serve the needs of different online advertisers and to earn money through paid web commercials. The main goal of a typical hijacker is to generate traffic and views for different sites and clicks for the ads that it spams on the users’ screens. However, since not all web ads and page redirects can be verified as safe, it’s still better if you stay away from anything that “This Mac Is Not Secure” may try to put on your screen. The best way to do that is, of course, to remove the hijacker and to ensure it never comes back by only visiting and downloading new software from reliable sites and by never clicking on anything questionable and suspicious that you may run into while browsing.


Name “This Mac Is Not Secure”
Type Browser Hijacker
Danger Level Medium (nowhere near threats like Ransomware, but still a security risk)
Symptoms Common hijacker symptoms are the changes in the browser and the page redirects triggered by the hijacker.
Distribution Method Some of the things that can get a hijacker installed on your computer are unreliable online advertisements, spam letters and installer bundles.
Detection Tool

Remove “This Mac Is Not Secure”


We get asked this a lot, so we are putting it here: Removing parasite manually may take hours and damage your system in the process. We recommend downloading ComboCleaner to see if it can detect parasite files for you.

The first thing you need to do is to Quit Safari (if it is opened). If you have trouble closing it normally, you may need to Force Quit Safari:

You can choose the Apple menu and click on Force Quit.

Alternatively you can simultaneously press (the Command key situated next to the space bar), Option (the key right next to it) and Escape (the key located at the upper left corner of your keyboard).

If you have done it right a dialog box titled Force Quit Applications will open up.

In this new dialog window select Safari, then press the Force Quit button, then confirm with Force Quit again.

Close the dialog box/window.



To remove parasite on your own, you may have to meddle with system files and registries. If you were to do this, you need to be extremely careful, because you may damage your system.

If you want to avoid the risk, we recommend downloading ComboCleaner
a professional malware removal tool.

More information on ComboCleaner, steps to uninstallEULA, and Privacy Policy.

Start Activity Monitor by opening up Finder, then proceed to activity-monitor

Once there, look at all the processes: if you believe any of them are hijacking your results, or are part of the problem, highlight the process with your mouse, then click the “i” button at the top. This will open up the following box:


Now click on Sample at the bottom:


Do this for all processes you believe are part of the threat, and run any suspicious files in our online virus scanner, then delete the malicious files:

Drag and Drop Files Here to Scan
Maximum file size: 128MB.

This scanner is free and will always remain free for our website's users. You can find its full-page version at:

Scan Results

Virus Scanner Result


The next step is to safely launch Safari again. Press and hold the Shift key while relaunching Safari. This will prevent Safari’s previously opened pages from loading again. Once Safari is opened up, you can release the Shift key.

On the off chance that you are still having trouble with scripts interrupting the closing of unwanted pages in Safari, you may need to take some additional measures.

First, Force Quit Safari again.

Now if you are using a Wi-Fi connection turn it off by selecting Wi-Fi off in you Mac’s Menu. If you are using a cable internet (Ethernet connection), disconnect the Ethernet cable.


Re-Launch Safari but don’t forget to press and hold the Shift button while doing it, so no previous pages can be opened up. Now, Click on Preferences in the Safari menu,

Preferences in Safari

and then again on the Extensions tab,

extensions in safari

Select and Uninstall any extensions that you don’t recognize by clicking on the Uninstall button. If you are not sure and don’t want to take any risks you can safely uninstall all extensions, none are required for normal system operation.

The threat has likely infected all of your browsers. The instructions below need to be applied for all browsers you are using.

Again select Preferences in the Safari Menu, but this time click on the Privacy tab,
Privacy in Safari

Now click on Remove All Website Data, confirm with Remove Now. Keep in mind that after you do this all stored website data will be deleted. You will need to sign-in again for all websites that require any form of authentication.

Still in the Preferences menu, hit the General tab

General Tab in Safari

Check if your Homepage is the one you have selected, if not change it to whatever you prefer.
Default Home Page

Select the History menu this time, and click on Clear History. This way you will prevent accidentally opening a problematic web page again.

firefox-512 How to Remove “This Mac Is Not Secure” From Firefox in OSX:

Open Firefoxclick on mozilla menu (top right) ——-> Add-onsHit Extensions next.

pic 6

The problem should be lurking somewhere around here –  Remove it. Then Refresh Your Firefox Settings.

chrome-logo-transparent-backgroundHow to Remove “This Mac Is Not Secure” From Chrome in OSX:

 Start Chrome, click chrome menu icon —–>More Tools —–> Extensions. There,  find the malware and  select  chrome-trash-icon.

pic 8

 Click chrome menu icon again, and proceed to Settings —> Search, the fourth tab, select Manage Search Engines.  Delete everything but the search engines you normally use. After that Reset Your Chrome Settings.

If the guide doesn’t help, download the anti-virus program we recommended or try our free online virus scanner. Also, you can always ask us in the comments for help!

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