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After updating Macintosh, users start to have a new malware: You have to know one thing: MacOSDefender is the program that shows advertisement to you. This program is completely in response for anything that goes wrong with your PC. In this item, we will define to you, how MacOSDefender penetrates the OS, how it functions and how to delete it. The removal section can be found under the main chapter. In case you don't want us to explain anything – just ignore it and go to the instructions.

What is MacOSDefender

MacOSDefender is the latest adware, but the greater part of the modifications invented through its lifetime were absolutely cosmetic. There's no need to be in progress for MacOSDefender, as it's not counting upon the complex tech solutions in its job – it counts on customer. Adware belongs to the plainest, but the most advantageous suspicious programs, which allow swindlers to receive their revenue without violating any laws. Naturally, it’s not like that from user's point of view: some tool penetrates the device, makes it in sluggish, calls many other similar tools on board, and pushes an huge heap of advertising down your throat. In most cases, victims have lots of things to say about it, yet the fact is that MacOSDefender did enter the PC with your approval. We're going to talk about it in the coming sections, and now – let’s explain what adware does in the system.

We've already told you that MacOSDefender's not a virus, since it can’t reproduce itself and distribute itself over the Net. It has to be downloaded, and after that – MacOSDefender has customer to install it. The process of installation includes confirmation of EULA, where all functions of adware are clearly stated. Of course, the direct installation of adware is a rare thing. Sponsored infection is the most effective technique, and we will tell you about it in the following paragraph. In rare cases customer isn't responsible for malicious program infecting the system, as it was downloaded by Trojan virus. But to do that, Trojan had to be invited into the OS too.


How MacOSDefender gets into the system

Sponsored infection is the plainest, swiftest and most effective way to distribute any tool over the Internet. Swindlers simply take a few tool, of which only one is decent and all the others aren’t, and adjoin them in a single package. During the installation of a good utility, you’ll get an offer to install the others. On occasion you can decline it, sometimes you can’t, but in most cases customers just don’t see it as they are clicking their way to install the package and don't bother to look at the information in all those stupid menus. Now you realize why we have told you that you have called MacOSDefender into your system.

How to remove MacOSDefender

Step 1. Download EtreCheck program

It's a free program to find and fix computer problems. You can do it from MAC app store here. Launch this software and permit it to find the problem files. Remove malicious elements.

Step 2. Check recently added applications

  • Click Applications in the Finder sidebar
  • Drag unwanted program to the Trash
  • Empty Trash

Step 3. Clean the browser


  • Start Safari browser
  • Display a menu of General Safari Settings
  • Reset Safari...
  • Press "Reset"

Google Chrome

Remove unfamiliar add-on:

  • Customize and Control Google Chrome
  • More Tools
  • Extensions
  • Remove add-on


Change homepage:

  • Customize and Control Google Chrome
  • Settings
  • Open a specific page or set of pages
  • Delete all specific pages


Mozilla Firefox

Delete suspicious extensions:


  • Open menu
  • Add-ons
  • Extensions
  • Remove add-on


Change homepage:

  • Open menu
  • Options
  • Home
  • Choose “Blank page” into Homepage and new windows


Opera browser

Disable strange add-ons:

  • Open Opera;
  • Customize and Control Opera;
  • Extensions;
  • Choose add-on and press button "Disable"

Change homepage:

  • Open Opera browser;
  • Customize and Control Opera;
  • Settings;
  • On Startup;
  • Open a specific page or set of pages;
  • Press button "Add a new page" and change Homepage to your favorite one.


Step 4. Scan the system

Scan the system with antimalware scanner to delete virus completely.

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Video how to reset browsers

How to protect the system

We know the ways to defend the machine from Trojans, pop-ups, malware and most of other malicious utilities. It won’t be easy. The method comprises a few behavioral patterns and habits you should abide, but it's not too hard and you will get used to it. Here’s our advice:

  • You'd better understand that some websites are not to be trusted. Hackers are trying to make you think that your machine is infested, by taking over an open tab and forcing you to confirm an installation of anything else. If the site's not responding – promptly abort its process through Process Manager, and open it again without re-opening the tabs. No webpage is capable of scanning your system for viruses within a moment and tell if it’s infected or not.
  • The advice #1 to guard your workstation is to forget about pirated utilities. When a program is gratis and you are certain that it’s decent – just find it on the reliable sources, and there won't be any problems. In case of a cracked soft – there are no official websites – just torrents. These sites don't bother about protection, and any file might be infected.
  • Another crucial thing is that, you should monitor all info that arises through the installation of any free software. We'd rephrase it: it's not necessary to inspect all 50 pages of EULA, just neglect offers to install anything except the wanted tool. If you see such proposals – you’d better act wisely.
  • You should not click on each pop-up you see. That’s the practice we want you to develop: you want information – get it from the trusted search engine. If an ad appears on any webpage or on your PC, it doesn’t mean that you need to click it. If anyone proposes you to install some tool and states that it’s great – use the search to learn more about it. To recognize faster - type the word "eliminate".

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