Remove K9-MacOptimizer from your operating system

Also Known As: K9-MacOptimizer potentially unwanted application
Type: Mac Virus
Distribution: Low
Damage level: Medium

How to remove "K9-MacOptimizer" from Mac computers

What is "K9-MacOptimizer"?

K9-MacOptimizer is software endorsed as an optimizer for the Mac operating system. It is supposedly capable of freeing-up space on the hard drive by removing "junk" and temporary files, securely deleting sensitive and confidential data, etc. K9-MacOptimizer is classified as a Potentially Unwanted Application (PUA) due to its dubious distribution methods. I.e., most users are tricked into installing this app, and it is often distributed together with other software. This deceptive marketing method of pre-packing regular content with PUAs is called "bundling".

K9-MacOptimizer scam

When installed, K9-MacOptimizer runs a system scan and detects various 'issues'. When users attempt to remove these issues, they find that they are required to purchase the activation key. I.e., in effect, purchase K9-MacOptimizer. PUAs can never be trusted. In most cases, these applications are untrusted and nonoperational. Even if purchased, they are unable to perform the advertised functions. Note that apps such as K9-MacOptimizer are often distributed together with other PUAs (e.g. browser hijackers and/or adware). In fact, unwanted applications cause numerous problems and are a threat to device and user safety. PUAs generate redirects to sale-oriented, untrustworthy, compromised, and even malicious websites. Additionally, they run intrusive advertisement campaigns. By implementing various tools, they enable third party graphical content to be displayed on any site. In this way, they deliver ads (pop-ups, banners, surveys, coupons, etc.), which diminish the browsing experience by overlaying web page content and limiting browsing performance. Some PUAs have data tracking abilities. They monitor browsing activity (URLs visited, pages viewed, search engine history, etc.) and gather personal information (IP addresses, geolocations, and personal details). This private data is then shared with third parties (potentially, cyber criminals) seeking to misuse it for financial gain. To summarize, PUAs can cause browser and system infiltration/infections and lead to serious privacy issues, financial loss, and even identity theft. To ensure device integrity and user safety, remove all dubious applications and browser extensions/plug-ins immediately.

Threat Summary:
Name K9-MacOptimizer potentially unwanted application
Threat Type PUP (potentially unwanted program), PUA (potentially unwanted application), Mac malware, Mac virus
Detection Names Avast (MacOS:Tuneupmac-B [Tool]), BitDefender (Gen:Variant.Application.MAC.OSX.MCPlus.1), Emsisoft (Gen:Variant.Application.MAC.OSX.MCPlus.1 (B)), ESET-NOD32 (A Variant Of OSX/TuneupMyMac.B Potentially Unwanted), Full list of detections (VirusTotal)
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.
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.

Most PUAs share certain traits, and those apps released by the same developers might even be identical. Mac Speedup Pro, MacOptimizer, and Mac Space Reviver are just some examples of applications similar to K9-MacOptimizer. They typically seem legitimate and offer various features, ranging from system cleaners and optimizers to content providers (e.g. TV, movie, radio, music, etc.). While these features may sound useful and beneficial, they are used to lure people to install. The advertised features are usually nonfunctional. The only purpose of PUAs is to generate revenue for the designers, whilst regular users receive nothing. Rather than delivering any value, PUAs cause redirects, deliver ad campaigns, and track vulnerable data.

How did potentially unwanted applications install on my computer?

Some PUAs, such as K9-MacOptimizer, have "official" websites, on which they are often advertised as "free" and "useful" software. As well as these deceptive sites, unwanted applications also proliferate through scam pages, which warn users of so-called 'threats' detected on their systems and endorse bogus tools for their removal. PUAs also proliferate via the download/install set-ups of other programs. This deceptive marketing technique ("bundling") is very popular amongst developers of unwanted and malicious content. Rushing download/installation processes (e.g. ignoring terms, skipping steps and sections, using pre-set options, etc.) endangers devices with potential system infiltration and infections. Intrusive advertisements are also known to proliferate PUAs. Once clicked, they execute scripts designed to make these rogue downloads/installs.

How to avoid installation of potentially unwanted applications

You are advised to research software and content to verify its legitimacy, before downloading/installing. Only trustworthy and verified download channels should be used. Peer-to-Peer sharing networks, unofficial and free file-hosting websites, third party downloaders, and similar sources are often untrustworthy and should not be used. Download and installation processes should be treated with caution. Read the terms, explore possible options, use the "Custom/Advanced" settings, and opt-out of downloading/installing additional apps, tools, features, etc. Intrusive advertisements usually seem legitimate and harmless, however, they often redirect to dubious web pages (e.g. gambling, pornography, adult-dating, etc.). If you encounter these ads/redirects, check the device and remove all suspicious applications and/or browser extensions/plug-ins without delay. If your computer is already infected with PUAs, we recommend running a scan with Combo Cleaner Antivirus for macOS to automatically eliminate them.

Screenshot of "K9-MacOptimizer" installer:

K9-MacOptimizer installer

Website promoting "K9-MacOptimizer":

K9-MacOptimizer promoter

Appearance of "K9-MacOptimizer" scam (GIF):

Appearance of K9-MacOptimizer scam (GIF)

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 K9-MacOptimizer unwanted application using Combo Cleaner:

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 k9-macoptimizer 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.

K9-MacOptimizer potentially unwanted application removal from Internet browsers:

safari browser iconRemove malicious extensions from Safari:

Remove k9-macoptimizer 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 k9-macoptimizer 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 k9-macoptimizer 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.

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.

QR Code
K9-MacOptimizer potentially unwanted application 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 K9-MacOptimizer potentially unwanted application on your mobile device.
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