FacebookTwitterLinkedIn

How to uninstall the DefaultUpgrade adware?

Also Known As: Ads by DefaultUpgrade
Type: Mac Virus
Damage level: Medium

What is DefaultUpgrade?

DefaultUpgrade is a potentially unwanted application (PUA) that generates unwanted advertisements and promotes a fake search engine (forces its users to visit a specific address). This app has characteristics of advertising-supported software and a browser hijacker.

DefaultUpgrade is a PUA because users rarely download and install apps of this type intentionally. It is worth mentioning that adware-type apps (and browser hijackers) are often designed to gather browsing data and (or) other information. In one way or another, DefaultUpgrade and similar apps cannot be trusted.

DefaultUpgrade adware

It is common for advertisements (e.g., pop-up ads, banners, surveys, coupons) generated by apps like DefaultUpgrade and other adware to be used to promote questionable, potentially malicious pages (e.g., pages like "Your MAC Has Been Blocked Due To Suspicious Activity!" and "Apple Platform Security"), potentially unwanted applications, etc.

Also, those ads can be used to trick users into downloading or installing unwanted software by designing them to run certain scripts: if clicked, those ads may start downloading or even installing some PUAs. Therefore, it is highly advisable not to click ads generated by apps like DefaultUpgrade.

Furthermore, DefaultUpgrade promotes a fake search engine by hijacking a browser (changing its settings). Typically, browser hijackers change settings such as the address of a default search engine, homepage, and new tab - they change them to an address of some fake search engine.

It is important to mention that fake search engines can be designed to promote untrustworthy pages (include their addresses in search results). Typically, addresses promoted by browser hijackers can be removed from the settings of hijacked browsers when those apps are no longer installed.

In other words, it is common that apps of this type are designed to keep their settings unchangeable as long as they are installed. Moreover, it is likely that DefaultUpgrade is designed to collect browsing data (e.g., IP addresses, entered search queries, URLs of visited websites, geolocations), or even sensitive information (e.g., passwords, credit card details).

Information gathered by potentially unwanted applications like DefaultUpgrade is often used for marketing purposes, to steal accounts, identities, make unauthorized purchases, transactions, etc. Of course, it depends on what data these apps can access. Either way, it is strongly recommended not to trust apps like DefaultUpgrade and remove any installed adware-type apps or browser hijackers as soon as possible.

Threat Summary:
Name Ads by DefaultUpgrade
Threat Type Adware, Mac malware, Mac virus
Detection Names Avast (MacOS:AdAgent-L [Adw]), AVG (MacOS:AdAgent-L [Adw]), ESET-NOD32 (A Variant Of OSX/Adware.Synataeb.D), Kaspersky (Not-a-virus:HEUR:AdWare.OSX.Adload.j), Full List (VirusTotal)
Additional Information This application belongs to Adload malware family.
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 seven days free trial available. Combo Cleaner is owned and operated by Rcs Lt, the parent company of PCRisk.com read more.

To summarize, potentially unwanted applications like DefaultUpgrade are monetized by designing them to generate advertisements, collect information and (or) promote questionable, potentially malicious pages, fake search engines.

Most of them are completely useless to their users and can be the culprit of problems like identity theft, monetary loss, issues related to online privacy, web browsing safety, etc. More adware examples are LocalTech, FileDisplay, and Helper_update.

How did DefaultUpgrade install on my computer?

Various potentially unwanted applications can often be found in downloaders, installers for other programs as additional offers. This distribution method is known as "bundling".

Users agree to download or install PUAs together with other programs (through their downloaders or installers) when they finish downloads or installations without changing certain settings. Typically, downloaders and installers that are used to distribute PUAs have "Advanced", "Manual", "Custom" or other settings/options, or ticked checkboxes.

Users can use those settings to choose not to download or install potentially unwanted applications. In some cases, PUAs are distributed via deceptive advertisements by designing them to execute certain scripts. Users cause unwanted downloads, installations by clicking those ads.

How to avoid installation of potentially unwanted applications?

It is not recommended to download or install any applications through third-party downloaders, installers, Peer-to-Peer networks like eMule, torrent clients, questionable websites, and other sources of this kind. It is common for those sources to be used to distribute unwanted, potentially malicious apps, files.

Therefore, it is recommended to use trustworthy (official) pages and direct links to download apps, files. Downloaders and installers with settings like "Custom", "Advanced" or ticked checkboxes should be checked included potentially unwanted apps.

It is common for those downloaders, installers to include additional offers. Advertisements on questionable tend to be designed to promote other untrustworthy websites. Sometimes, those ads can cause unwanted downloads or even installations.

Therefore, those ads should not be trusted (clicked). Any suspicious, unwanted extensions, add-ons, or plug-ins installed on a browser should be removed. The same should be applied to programs of this kind installed on the operating system.

If your computer is already infected with DefaultUpgrade, we recommend running a scan with Combo Cleaner Antivirus for macOS to automatically eliminate this adware.

Pop-up window that appears after installation of the DefaultUpgrade application:

defaultupgrade adware pop-up displayed once installation is done

DefaultUpgrade's Contents folder:

defaultupgrade adware contents folder

Instant automatic Mac malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced IT 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 seven days free trial available. Combo Cleaner is owned and operated by Rcs Lt, the parent company of PCRisk.com read more.

Quick menu:

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

DefaultUpgrade adware removal:

Remove DefaultUpgrade-related 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 adware-related files and folders

Mac Go To Folder step

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

Mac removing related files and folders - step 1Check for adware generated files in the /Library/LaunchAgents/ folder:

Mac go to /Library/LaunchAgents - step 1

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

Mac go to /Library/LaunchAgents - 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 exact same string.

Mac removing related files and folders - step 2Check for adware generated files in the ~/Library/Application Support/ folder:

Mac go to /Library/Application Support - step 1

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

Mac go to /Library/Application Support - 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.

Mac removing related files and folders - step 3Check for adware generated files in the ~/Library/LaunchAgents/ folder:

Mac go to ~/Library/LaunchAgents - step 1

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

Mac go to ~/Library/LaunchAgents - 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 exact same string.

Mac removing related files and folders - step 4Check for adware generated files in the /Library/LaunchDaemons/ folder:

Mac go to /Library/LaunchDaemons - step 1

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

Mac go to /Library/LaunchDaemons - 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.

Mac removing malware related files and folders - step 5Scan your Mac with Combo Cleaner:

If you have followed all the steps correctly, your Mac should be clean of infections. To ensure 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 the 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 its virus definition database and click the "Start Combo Scan" button.

Mac remove malware with Combo Cleaner - step 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.

Mac remove malware with Combo Cleaner - step 2

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

Remove malicious extensions from Internet browsers

Safari iconRemove malicious Safari extensions:

Removal of malicious extensions in Safari - step 1

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

Removal of malicious extensions in Safari - step 2

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 regular browser operation.

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

Google Chrome logoRemove malicious extensions from Google Chrome:

Removal of malicious extensions in Google Chrome - step 1

Click the Chrome menu icon Google Chrome menu icon (at the top right corner of Google Chrome), select "More Tools" and click "Extensions". Locate all recently-installed suspicious extensions, select these entries and click "Remove".

Removal of malicious extensions in Google Chrome - step 2

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

Mozilla Firefox logoRemove malicious extensions from Mozilla Firefox:

Removal of malicious extensions in Mozilla Firefox - step 1

Click the Firefox menu firefox menu icon (at the top right corner of the main window) and select "Add-ons and themes". Click "Extensions", in the opened window locate all recently-installed suspicious extensions, click on the three dots and then click "Remove".

Removal of malicious extensions in Mozilla Firefox - step 2

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

▼ Show Discussion

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.

Our malware removal guides are free. However, if you want to support us you can send us a donation.

About PCrisk

PCrisk is a cyber security portal, informing Internet users about the latest digital threats. Our content is provided by security experts and professional malware researchers. Read more about us.

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
Ads by DefaultUpgrade QR code
Scan this QR code to have an easy access removal guide of Ads by DefaultUpgrade on your mobile device.
We Recommend:

Get rid of Mac malware infections today:

▼ REMOVE IT NOW
Download Combo Cleaner for Mac

Platform: macOS

Editors' Rating for Combo Cleaner:
Editors ratingOutstanding!

[Back to Top]

To use full-featured product, you have to purchase a license for Combo Cleaner. Limited seven days free trial available. Combo Cleaner is owned and operated by Rcs Lt, the parent company of PCRisk.com read more.