Mac Virus

macOS Cannot Verify that This App is Free from Malware

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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macOS cannot verify that this app is free from malware.

If you try to open a certain app on your Mac computer, and you get the message “macOS cannot verify that this app is free from malware.”, this means that Apple cannot verify that the said application is safe. Seeing this message doesn’t necessarily mean that the app you are trying to open is harmful, but in a lot of cases, it’s an indicator of malware in the computer, which is why you shouldn’t ignore it. 

macOS cannot verify

If you see this alert window, it means that the app was not authenticated.

macOS uses the GateKeeper technology in order to keep your computer safe from unreliable and potentially hazardous software. The apps that Gatekeeper deems safe are ones that come from the App Store, or ones that aren’t from the store but are created by verified developers. With the Catalina update, there’s an additional safety requirement for apps that are from out of the store – they need to be notarized by Apple.

The default setting of the security and privacy preferences on Mac is to allow the installation and execution of apps that are from the store or ones that have verified developers and have been notarized by Apple. Those preferences can be optimized for even greater security by setting them to only allow apps from the Store.

All of this may seem like quite a lot of security requirements, but this safety policy is one of the things that make Mac systems so reliable. Therefore, if you see this message on your screen, and you aren’t a hundred percent sure that the app you are trying to open is safe, it’s best to check your computer for malware.

macOS cannot verify that this app is free from malware. Bypass

MacOS cannot verify that this app is free from malware.” is the warning you get when an app isn’t from the Store, and isn’t notarized. The “MacOS cannot verify that this app is free from malware” might indicate malware in your system. Now, if you are certain that the application is safe, and contains no malware, you can override this warning, and open the application (we will show you how to do that below). However, you shouldn’t try to open every random app that Apple cannot verify as safe – only override the warning if you are absolutely sure that the software you are trying to open isn’t harmful, and hasn’t been tampered with. Otherwise, it’s much better to delete the program, and then check the computer for any leftover malicious data – the removal guide below will explain to you exactly how to do that.

In most cases, there is a reason why a certain app isn’t in the App Store and hasn’t been notarized by Apple. Even it isn’t actual malware, it may be some potentially unwanted program that might trick you into buying products you don’t need, show unreliable ads in the browser, make unauthorized changes in the system, and potentially expose your system to more serious hazards, such as Trojan Horses and Spyware.

Now that you have been warned, here is how you could change your security preferences so that you can open unverified apps, and bypass the “MacOS cannot verify that this app is free from malware” security warning:

  1. Go to System Preferences, and open Security & Privacy.
  2. In the General Tab, under Allow apps downloaded from, you should see the app you’ve been trying to open – click on the Open Anyway button to its right.
  3. You will once again see a warning message that tells you the app cannot be verified as safe, but this time you will have the option to open it anyway. If you are certain you want to execute the app, click on Open.

Once you do that, you will no longer get the “MacOS cannot verify that this app is free from malware” warning whenever you try to open this particular program, as it will now be added to the exceptions list.

Now, if you are if you aren’t sure whether or not your system has malware in it, we advise you to take a look below – the instructions you will find there will help you check your Mac for viruses and malware, and remove anything that gets detected.


Name MacOS Cannot Verify that this app is free from malware.
Type Browser Hijacker
Danger Level Medium (nowhere near threats like Ransomware, but still a security risk)
Symptoms Changes in the browser’s homepage or search engine may indicate the presence of this software. 
Distribution Method Typically found inside different free software bundles and installation packages, torrents, ads, free download links, browser add-ons.
Detection Tool

macOS cannot verify Pop up Removal


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 MacOS cannot verify 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 MacOS cannot verify From Chrome in OSX:

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