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?

What is "K9-MacOptimizer"?

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

K9-MacOptimizer scam

Once installed, K9-MacOptimizer runs a system scan and detects various issues. When users attempt to remove said issues, they find that they need to purchase the activation key, in other words - they need to buy K9-MacOptimizer. However, PUAs are not to be trusted. In most cases, such applications are fraudulent and nonoperational. Therefore, despite being purchased, they are unable to perform the advertised functions. Users should note that apps like K9-MacOptimizer are often distributed with other PUAs (e.g. browser hijackers and/or adware). In fact, unwanted applications cause a variety of inconveniences and problems; they are also considered to be a threat to device and user safety. PUAs are designed to 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. Thereby delivering ads (pop-ups, banners, surveys, coupons, etc.), which diminish browsing quality - overlay page content and limit browsing speed. Some PUAs posses 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 infiltrations/infections, as well as lead to severe privacy issues, financial losses and even identity theft. To ensure device integrity and user safety - all dubious applications and browser extensions/plug-ins must be removed immediately.

Threat Summary:
Name K9-MacOptimizer potentially unwanted application
Threat Type 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 became slower than normal, you see unwanted pop-up ads, you get redirected to shady websites.
Distribution methods Deceptive pop-up ads, free software installers (bundling), fake flash player installers, torrent file downloads.
Damage Internet browsing tracking (potential privacy issues), displaying of unwanted ads, redirects to shady websites, loss of private information.
Removal

To eliminate K9-MacOptimizer potentially unwanted application 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.

Most PUAs share certain traits, such apps released by the same developers can even be identical. Mac Speedup Pro, MacOptimizer, Mac Space Reviver are a few examples of applications similar to K9-MacOptimizer. They typically appear legitimate and offer various features, ranging from system cleaners and optimizers to content providers (e.g. TV, movie, radio, music, etc.). While these features can sound useful and beneficial, they are merely bait to lure users into installation. Usually all advertised features are nonfunctional. The only purpose of unwanted applications is to generate revenue for their designers; to users they have no genuine value. Instead of delivering on any promises, PUAs cause redirects, deliver ad campaigns and track vulnerable data.

How did potentially unwanted applications install on my computer?

Some PUAs, like K9-MacOptimizer, have "official" websites, where they are often advertised as "free" and "handy" software. Aside from such deceptive sites, unwanted applications also spread through scam pages, which warn users of fake threats detected on their systems and endorse fraudulent tools for their removal. PUAs also proliferate via download/install setups of other programs. This deceptive marketing technique ("bundling") is very popular amongst developers of unwanted and malicious content. Rushed download/installation processes (e.g. ignored terms, skipped steps and sections, used pre-set options, etc.) - endanger devices with potential system infiltrations and infections. Intrusive advertisements are known to spread of PUAs as well. Once clicked, they can execute scripts, designed to make such rogue downloads/installs.

How to avoid installation of potentially unwanted applications?

It is recommended to always research wanted content to verify its legitimacy, before downloading/installing it. 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 deemed to be untrustworthy; therefore are advised against use. Download and installation processes should be treated with care. That includes reading terms, exploring possible options, using the "Custom/Advanced" settings and opting-out from downloading/installing additional apps, tools, features, etc. Intrusive advertisements usually look legitimate and harmless, however they redirect to dubious webpages (e.g. gambling, pornography, adult-dating, etc.). Should users encounter such ads/redirects, they are strongly advised to 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 removal of K9-MacOptimizer potentially unwanted application: 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 K9-MacOptimizer potentially unwanted application. 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 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 virus and spyware activity level today:

Medium threat activity
Medium

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.
We Recommend:

Get rid of K9-MacOptimizer potentially unwanted application 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.