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How to uninstall MacMaster from macOS

Also Known As: MacMaster potentially unwanted application
Type: Mac Virus
Damage level: Medium

How to remove MacMaster from Mac computers

What is MacMaster?

The MacMaster application allows users to scan Mac computers for large, old, and duplicate files, and to uninstall unwanted software, clean the browsing history, cookies and HTML local storage. In summary, this app cleans Mac computers, however, it is often distributed through rogue installers. People who use these installers often install rogue apps inadvertently. Therefore, MacMaster is categorized as a potentially unwanted application (PUA).

MacMaster unwanted application

The aforementioned installers are used to distribute apps like MacMaster and also other types of PUAs such as adware and browser hijackers. Adware serves advertisements including banners, coupons, surveys, pop-ups and others. When clicked, these ads can open untrusted pages or even execute scripts designed to download and install unwanted, potentially malicious apps. Browser hijackers are PUAs that promote fake search engine addresses by changing browser settings, such as the address of the homepage, default search engine and new tab. In most cases, fake search engines do not generate unique results (they provide those generated by other, usually legitimate, search engines). They can also generate results that include links to dubious web pages. Adware-type apps and browser hijackers often collect data (IP addresses, entered search queries, addresses of visited pages, geolocations, etc.). Note that rogue installers such as those used to distribute MacMaster could be designed to proliferate (install) malware including ransomware, Trojans, and other software of this kind. Therefore, never use third party (unofficial) installers - download and install your software only from official websites.

Threat Summary:
Name MacMaster potentially unwanted application
Threat Type PUP (potentially unwanted program), PUA (potentially unwanted application), Mac malware, Mac virus.
Supposed Functionality Mac cleaner.
Detection Names Avast (MacOS:PuAgent-AH [PUP]), AVG (MacOS:PuAgent-AH [PUP]), ESET-NOD32 (OSX/MacMaster.C Potentially Unwanted), Microsoft (Misleading:Win32/Lodi), Full List Of Detections (VirusTotal).
Symptoms A program that you do not recall installing suddenly appeared on your computer. A new application is performing computer scans and displays warning messages about 'found issues'. Asks for payment to eliminate the supposedly found errors.
Distribution Methods Deceptive pop-up ads, free software installers (bundling), fake Flash Player installers.
Damage Monetary loss (unnecessary purchase of fake software), unwanted warning pop-ups, slow computer performance.
Malware Removal (Mac)

To eliminate possible malware infections, scan your Mac with legitimate antivirus software. Our security researchers recommend using Combo Cleaner.
▼ Download Combo Cleaner for Mac
To use full-featured product, you have to purchase a license for Combo Cleaner. Limited three days free trial available.

Other examples of apps that are distributed using the same or similar methods are Quick Mac Fixer, Total Mac Fixer and Quick Mac Booster. You are advised against trusting any apps that are categorized as PUAs, especially if they require payment. Some perform fake virus/error scans, or attempt to trick people into paying for activation in other ways.

How did potentially unwanted applications install on my computer?

PUAs are often downloaded/installed together with other products. This deceptive marketing technique of pre-packing regular software with unwanted or malicious additions is called "bundling". By rushing through download/installation (e.g. ignoring terms, skipping steps and sections, using "Quick/Express" settings, etc.), many users risk unintentionally allowing bundled content into their devices. Intrusive advertisements proliferate PUAs as well. When clicked, the ads can execute scripts to download/install these applications without users' permission. Some PUAs have "official" download web pages.

How to avoid installation of potentially unwanted applications

You are advised to download programs and files from official pages and through direct download links. Other sources/tools such as torrent clients, eMule (and other Peer-to-Peer networks), third party downloaders, unofficial websites, etc., can be used to distribute unwanted, potentially malicious programs. The same applies to third party installers. Check all "Advanced", "Custom" and other settings, and decline offers to download or install unwanted apps. Additionally, do not click advertisements that appear on dubious websites, since they can open untrusted sites or even cause unwanted downloads and installations. Remove any unwanted, suspicious applications (extensions, add-ons, plug-ins) that are installed on the browser. The same should be applied to programs of this kind that are installed on the computer. If your computer is already infected with PUAs, we recommend running a scan with Combo Cleaner Antivirus for macOS to automatically eliminate them.

Appearance of MacMaster application (GIF):

macmaster unwanted application appearance in gif image

Download page for MacMaster:

macmaster unwanted application promoter page

MacMaster installer

 macmaster unwanted application installer

Instant automatic Mac malware removal: 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 Mac malware. 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. To use full-featured product, you have to purchase a license for Combo Cleaner. Limited three days free trial available.

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 macmaster potentially unwanted application 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.

MacMaster potentially unwanted application removal from Internet browsers:

safari browser iconRemove malicious extensions from Safari:

Remove macmaster potentially unwanted application 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 macmaster potentially unwanted application 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 macmaster potentially unwanted application 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.

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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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Malware activity

Global malware activity level today:

Medium threat activity

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

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MacMaster potentially unwanted application QR code
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Platform: macOS

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