“System Mac OS is infected” Virus

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*Source of claim SH can remove it.

System Mac OS is infected

“System Mac OS is infected” is a type of application that integrates with the main web browser on Mac computers. “System Mac OS is infected” is compatible with most popular web browsers, including Safari, Chrome and Firefox.

The presence of"System Mac OS is infected" may additionally introduce fresh browser elements to the interface of the program.
Screenshot of the “System Mac OS is infected” virus on Mac

Experts categorize this particular application as a browser hijacker. And the reason it falls into this category is due to its highly invasive nature and the type of actions it undertakes once it embeds itself in your favorite browsing program. Namely, a program like “System Mac OS is infected” will typically override your browser configurations and alter them in a way that best suits its agenda. Typically this implies changes to the browser’s homepage, as well as the introduction of a new search engine as the default one.

Furthermore, “System Mac OS is infected” may also add new browser elements to the program’s interface, such as new buttons, an extra toolbar, etc. Then as for the behavior changes, you might notice that your web browser has started to trigger spontaneous page redirects during your online sessions. This is another highly likely consequence of having a browser hijacker installed on your computer. And the same is also true if you’ve noticed a sudden substantial increase in the amount of displayed online ads on your screen: popups, banners, box messages and various colorful links may be largely defining your browsing experience at this point. This is actually one of the main purposes of software like “System Mac OS is infected”, and we’ll explain further on in this post why that is.

System Mac OS is infected for Mac

“System Mac OS is infected” for Mac is mainly designed as an online advertising tool. “System Mac OS is infected” for Mac delivers tailored ads directly to users from within their own computers.

And while there is nothing inherently wrong with this practice, let’s face the facts: there’s little to no benefit from all of this for the actual end user. What’s more, programs like “System Mac OS is infected” and Ask You Virus predominantly get installed in people’s computers without the users either knowing about it, or let alone wanting it. This is one of the reasons why many experts tend to see this particular category of software as potentially unwanted. And it’s also good enough reason for the affected users to want to remove these browser hijackers as quickly as possible.

What is System Mac OS is infected?

Due to its aggressive advertising approaches, “System Mac OS is infected” is often confused with malware and viruses. However, “System Mac OS is infected” cannot harm your system and is therefore not considered malicious.

But that doesn’t make this type of software 100% safe either. In fact, the risk of running into dangerous threats such as Trojans and ransomware viruses increases quite noticeably after the installation of a browser hijacker such as this one. And it’s all due to the immense quantities of unverified content that it may push on you.

The System Mac OS is infected app

The “System Mac OS is infected” app is notoriously stubborn and may not offer you an obvious way to remove it. Unlike regular software, you will need to take some additional steps in order to completely uninstall the “System Mac OS is infected” app and get rid of all its changes.

And luckily, we have listed them in detail in the free removal guide below.


NameSystem Mac OS is infected
TypeAdware/Browser Hijacker
Danger LevelMedium (nowhere near threats like Ransomware, but still a security risk)
SymptomsPage redirects to various sponsored web locations, online ads littering the screen during browsing sessions, changes made to the browser’s homepage and search engine, etc.
Distribution MethodUsually with the help of program bundles that are typically downloaded from unreliable sources.
Detection Tool

*Source of claim SH can remove it.

“System Mac OS is infected” Removal

For a quick way to remove “System Mac OS is infected” try to do this inside your Mac browser:

  1. Open your Mac browser.
  2. Go to Preferences.
  3. Now navigate to the extensions sub-menu.
  4. Look for any unfamiliar entries, including “System Mac OS is infected”.
  5. Remove “System Mac OS is infected” from your Mac as well as any other suspicious-looking items by clicking on the trash bin icon.

If this does not help then continue reading this article for more detailed instructions on how to get rid of “System Mac OS is infected”!


*Source of claim SH can remove it.

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.



*Source of claim SH can remove it.

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:

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    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 “System Mac OS is infected” 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 “System Mac OS is infected” 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!


    About the author


    Violet George

    Violet is an active writer with a passion for all things cyber security. She enjoys helping victims of computer virus infections remove them and successfully deal with the aftermath of the attacks. But most importantly, Violet makes it her priority to spend time educating people on privacy issues and maintaining the safety of their computers. It is her firm belief that by spreading this information, she can empower web users to effectively protect their personal data and their devices from hackers and cybercriminals.

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