Avoid websites displaying the "Your Mac OS Might Be Infected" message

Also Known As: Your Mac OS might be infected pop-up
Type: Mac Virus
Distribution: Moderate
Damage level: Medium

How to prevent redirects to "Your Mac OS Might Be Infected" on Mac computers

What is "Your Mac OS Might Be Infected"?

Many deceptive websites display fake pop-up messages and trick visitors into downloading and installing dubious applications. They often display an identical pop-up window and message. This web page is one example and is used to distribute Smart Mac Booster, however, it might also be used to promote other, similar applications. Typically, visitors are encouraged to install the app and use it for removal of detected malware. We advise against downloading or installing apps that are advertised though websites of this type. Browsers often open these sites due to potentially unwanted applications (PUAs) installed on them.

Your Mac OS Might Be Infected scam

Once opened, this deceptive site displays a pop-up window with a notification stating that the MacOS might be infected. To begin the repair process, visitors are urged to click the "OK" button. The main page states that the operating system (in this case, MacOS High Sierra) is infected with three viruses. To avoid further system damage (loss of photos, apps, and other data), visitors are encouraged to remove the viruses immediately. It is also mentioned that banking information is at risk. Visitors are supposedly able to remove detected malware after scanning their systems by clicking the "Scan Now" button. This web page runs a fake scanner, which detects certain malicious software and then offers to remove it by downloading the maccleaner.pkg file, which it uses to install the Smart Mac Booster app. In fact, this web page might also be used to promote other dubious apps. Some examples of apps of this kind are Mac Clean Pro, Advanced Mac Booster, and Qbit Mac Speedup. In any case, do not download or install any apps that are distributed through dubious sites such as this.

Apps that force browsers to open deceptive and untrustworthy websites often gather information relating to users and display unwanted ads. They record details such as IP addresses, geolocations, addresses of visited websites, entered search queries, etc. Some PUAs might be designed to collect personal information. Typically, developers share the details with third parties who misuse them to generate revenue. Furthermore, these apps might serve coupons, surveys, banners, pop-ups, and other intrusive, unwanted ads. These usually conceal underlying content of visited websites. Furthermore, people who click them are redirected to dubious web pages, or they cause download/installation of unwanted applications.

Threat Summary:
Name Your Mac OS might be infected pop-up
Threat Type Mac malware, Mac virus.
Fake Claim According to the message on this deceptive web page, the user's operating system is infected with three viruses.
Promoted Unwanted Application Smart Mac Booster
Related Domains Full list below.
Symptoms Your Mac becomes slower than normal, you see unwanted pop-up ads, you are redirected to dubious websites.
Distribution methods Deceptive pop-up ads, free software installers (bundling), fake Flash Player installers, torrent file downloads.
Damage Internet browser tracking (potential privacy issues), display of unwanted ads, redirects to dubious websites, loss of private information.
Removal

To eliminate Your Mac OS might be infected pop-up our malware researchers recommend scanning your computer with Combo Cleaner.
▼ Download Combo Cleaner
Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Combo Cleaner.

"Your Mac OS Might Be Infected" is a message that is displayed in pop-up windows on many deceptive web pages, which are used to trick visitors into downloading and installing untrustworthy software. Other examples of similar sites are Mondaysunday, apple.com-guard-device[.]live, and apple.com-optimize-mac[.]live. We recommend that you ignore these websites and never download anything from them. PUAs (apps that force browsers to open the web pages) are usually advertised as 'useful applications', however, most are useless and cause only problems. People who have them installed on their systems risk problems with browsing safety, privacy, or they might even have their identities stolen.

How did potentially unwanted applications install on my computer?

People often cause download/installation of PUAs unintentionally. This happens when they click deceptive ads that execute scripts designed to cause unwanted downloads/installations, or when developers use a deceptive marketing method called "bundling". When they distribute PUAs using this method, they include unwanted apps into the set-ups of other software. They hide offers to download or install additional apps in "Custom", "Advanced", "Manual", and other similar settings. In many cases, people cause installation/downloads of various unwanted apps simply by leaving all available settings unchecked and unchanged.

How to avoid installation of potentially unwanted applications

Do not download or install programs using third party downloaders, Peer-to-Peer networks such as torrent clients, eMule, untrustworthy (unofficial) websites, and so on. The best way is to use official websites and direct download links. Check "Advanced", "Custom" and other settings of any download or installation setup and deselect offers to download or install unwanted applications. Do not click intrusive advertisements, since these can redirect to untrustworthy websites or lead to unwanted downloads/installations. If the browser causes unwanted redirects or displays ads, check for unwanted extensions, plug-ins, and add-ons installed on it. Also check the list of installed programs on the computer. Remove all unwanted, suspicious software immediately. If your computer is already infected with PUAs, we recommend running a scan with Combo Cleaner Antivirus for macOS to automatically eliminate them.

Text in a pop-up:

IMMEDIATE ACTION REQUIRED !

You Mac OS might be infected.

Press OK to begin the repair process.

Screenshot of the main web page:

You Mac OS might be infected background page

Text in this web page:

Your OS High Sierra is infected with (3) viruses!
Your OS High Sierra is infected with (3) viruses. Our security check found traces of 2 malware and 1 phishing/spyware. System damage: 28.1% - Immediate removal required!
The immediate removal of the viruses is required to prevent further system damage, loss of Apps, Photos or other files. Traces of 1 phishing/spyware were found on your OS High Sierra with.
Personal and banking information are at risk.
To avoid more damage click on 'Scan Now' immediately. Our deep scan will provide help immediately!
4 minutes and seconds 38 remaining before damage is permanent. Scan Now

Appearance of "Your Mac OS Might Be Infected" scam (GIF):

Appearance of Your Mac OS Might Be Infected scam (GIF)

List of websites related to this pop-up scam:

lp.bitscleanutils[.]xyz lp.macsmart-faster[.]top lp.onemacutils[.]club
lp.bitsspeeduptools[.]xyz lp.macsmart-optimize[.]club lp.qbitautofixclean[.]xyz
lp.fastmactools[.]xyz lp.macsmart-optimize[.]top lp.qbitspeednow[.]club
lp.highmactools[.]club lp.macsmart-smartbooster[.]club lp.qbitspeedyutil[.]club
lp.macapps-center[.]club lp.macsmart-secure[.]club lp.smartmacutils.info
lp.macapps-centers[.]club lp.macutils[.]club lp.speedytools[.]club
lp.macapps-optimize[.]club lp.mbitmacclean[.]live lp.speedyutils[.]live
lp.macsmart-boost[.]club lp.mbitmacfast[.]xyz lp.sysbitstools[.]xyz
lp.macsmart-center[.]club lp.mbitmacspeed[.]live lp.tunesysbooster[.]xyz
lp.macsmart-cleanupc[.]club lp.mbitmacutils[.]xyz smartmacutils[.]co
lp.macsmart-faster[.]club lp.newmactools[.]live smartmacutils[.]net

Smart Mac Booster installer:

installer of Smart Mac Booster unwanted app

Smart Mac Booster application:

Smart Mac Booster unwanted application

Instant automatic removal of Your Mac OS might be infected pop-up: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Combo Cleaner is a professional automatic malware removal tool that is recommended to get rid of Your Mac OS might be infected pop-up. Download it by clicking the button below:
▼ DOWNLOAD Combo Cleaner for Mac By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Combo Cleaner.

Quick menu:

Video showing how to remove adware and browser hijackers from a Mac computer:

Potentially unwanted applications removal:

Remove potentially unwanted applications from your "Applications" folder:

mac browser hijacker removal from applications folder

Click the Finder icon. In the Finder window, select "Applications". In the applications folder, look for "MPlayerX", "NicePlayer", or other suspicious applications and drag them to the Trash. After removing the potentially unwanted application(s) that cause online ads, scan your Mac for any remaining unwanted components.

Remove your mac os might be infected pop-up related files and folders:

Finder go to folder command

Click the Finder icon, from the menu bar. Choose Go, and click Go to Folder...

step1Check for adware-generated files in the /Library/LaunchAgents folder:

removing adware from launch agents folder step 1

In the Go to Folder... bar, type: /Library/LaunchAgents

removing adware from launch agents folder step 2
In the “LaunchAgents” folder, look for any recently-added suspicious files and move them to the Trash. Examples of files generated by adware - “installmac.AppRemoval.plist”, “myppes.download.plist”, “mykotlerino.ltvbit.plist”, “kuklorest.update.plist”, etc. Adware commonly installs several files with the same string.

step2Check for adware generated files in the /Library/Application Support folder:

removing adware from application support folder step 1

In the Go to Folder... bar, type: /Library/Application Support

removing adware from application support folder step 2
In the “Application Support” folder, look for any recently-added suspicious folders. For example, “MplayerX” or “NicePlayer”, and move these folders to the Trash.

step3Check for adware-generated files in the ~/Library/LaunchAgents folder:

removing adware from ~launch agents folder step 1


In the Go to Folder bar, type: ~/Library/LaunchAgents

removing adware from ~launch agents folder step 2

In the “LaunchAgents” folder, look for any recently-added suspicious files and move them to the Trash. Examples of files generated by adware - “installmac.AppRemoval.plist”, “myppes.download.plist”, “mykotlerino.ltvbit.plist”, “kuklorest.update.plist”, etc. Adware commonly installs several files with the same string.

step4Check for adware-generated files in the /Library/LaunchDaemons folder:

removing adware from launch daemons folder step 1
In the Go to Folder... bar, type: /Library/LaunchDaemons

removing adware from launch daemons folder step 2
In the “LaunchDaemons” folder, look for recently-added suspicious files. For example “com.aoudad.net-preferences.plist”, “com.myppes.net-preferences.plist”, "com.kuklorest.net-preferences.plist”, “com.avickUpd.plist”, etc., and move them to the Trash.

step 5 Scan your Mac with Combo Cleaner:

If you have followed all the steps in the correct order you Mac should be clean of infections. To be sure your system is not infected run a scan with Combo Cleaner Antivirus. Download it HERE. After downloading the file double click combocleaner.dmg installer, in the opened window drag and drop Combo Cleaner icon on top of the Applications icon. Now open your launchpad and click on the Combo Cleaner icon. Wait until Combo Cleaner updates it's virus definition database and click "Start Combo Scan" button.

scan-with-combo-cleaner-1

Combo Cleaner will scan your Mac for malware infections. If the antivirus scan displays "no threats found" - this means that you can continue with the removal guide, otherwise it's recommended to remove any found infections before continuing.

scan-with-combo-cleaner-2

After removing files and folders generated by the adware, continue to remove rogue extensions from your Internet browsers.

Your Mac OS might be infected pop-up removal from Internet browsers:

safari browser iconRemove malicious extensions from Safari:

Remove your mac os might be infected pop-up related Safari extensions:

safari browser preferences

Open Safari browser, from the menu bar, select "Safari" and click "Preferences...".

safari extensions window

In the preferences window, select "Extensions" and look for any recently-installed suspicious extensions. When located, click the "Uninstall" button next to it/them. Note that you can safely uninstall all extensions from your Safari browser - none are crucial for normal browser operation.

  • If you continue to have problems with browser redirects and unwanted advertisements - Reset Safari.

firefox browser iconRemove malicious plug-ins from Mozilla Firefox:

Remove your mac os might be infected pop-up related Mozilla Firefox add-ons:

accessing mozilla firefox add-ons

Open your Mozilla Firefox browser. At the top right corner of the screen, click the "Open Menu" (three horizontal lines) button. From the opened menu, choose "Add-ons".

removing malicious add-ons from mozilla firefox

Choose the "Extensions" tab and look for any recently-installed suspicious add-ons. When located, click the "Remove" button next to it/them. Note that you can safely uninstall all extensions from your Mozilla Firefox browser - none are crucial for normal browser operation.

  • If you continue to have problems with browser redirects and unwanted advertisements - Reset Mozilla Firefox.

chrome-browser-iconRemove malicious extensions from Google Chrome:

Remove your mac os might be infected pop-up related Google Chrome add-ons:

removing malicious google chrome extensions step 1

Open Google Chrome and click the "Chrome menu" (three horizontal lines) button located in the top-right corner of the browser window. From the drop-down menu, choose "More Tools" and select "Extensions".

removing malicious Google Chrome extensions step 2

In the "Extensions" window, look for any recently-installed suspicious add-ons. When located, click the "Trash" button next to it/them. Note that you can safely uninstall all extensions from your Google Chrome browser - none are crucial for normal browser operation.

  • If you continue to have problems with browser redirects and unwanted advertisements - Reset Google Chrome.

About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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Removal Instructions in other languages
Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
Your Mac OS might be infected pop-up QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of Your Mac OS might be infected pop-up on your mobile device.
We Recommend:

Get rid of Your Mac OS might be infected pop-up today:

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Platform: macOS

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Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Combo Cleaner.