Macos-online-security-check.com POP-UP Scam (Mac)

Also Known As: "Macos-online-security-check.com" virus
Type: Mac Virus
Distribution: Low
Damage level: Medium

How to remove "macos-online-security-check[.]com" from Mac?

What is "macos-online-security-check[.]com"?

macos-online-security-check[.]com is deceptive, scam website that is used to promote a potentially unwanted app (PUA) called Mac Cleanup Pro. Visitors are encouraged to download and install this app to remove viruses that this website has supposedly detected. In fact, this is a common scam that displays a fake virus alert. It should not be trusted. People are often redirected to these websites by PUAs already installed on their browsers or computers. PUAs feed users with ads and gather information relating to browsing activity.

macos-online-security-check[.]com  scam

macos-online-security-check[.]com displays a pop-up window stating that this website has detected a trojan virus that should be removed immediately. When closed, this scam website informs visitors that their Mac computers are infected with more than one virus that it has detected: two malware infections and one phishing/spyware infection. Visitors are encouraged to scan their systems within a few minutes, otherwise the detected viruses might cause data or even financial loss. If the "Scan Now" button is clicked, this website starts a fake scan that, once finished, states that it has detected Tapsnake, CronDNS, and Dubfishicv viruses. To remove them, macos-online-security-check[.]com offers download of the Mac Cleanup Pro app by clicking the "REMOVE VIRUSES NOW" button. In fact, the website states that it promotes the Mac Speedup Pro. We advise against downloading applications that are promoted using scam websites. If opened, these websites should be ignored and closed.

Apps that cause redirects to pages such as macos-online-security-check[.]com often display intrusive ads and collect information. They deploy pop-up ads, coupons, banners, surveys, and so on. When clicked, these ads often cause redirects to dubious websites or even execute scripts designed to download and install unwanted apps. Information tracking is also an issue. Many PUAs record IP addresses, URLs of visited websites, entered search queries, geolocations and other browsing-related data. In some cases, they target personal, sensitive details. Developers share the data with third parties who misuse it to generate revenue. Therefore, having apps of this type installed can lead to problems with privacy and identity theft. We strongly recommend that you remove all installed PUAs immediately.

Threat Summary:
Name "Macos-online-security-check.com" virus
Threat Type Scam, Fake error, Phishing, Mac Virus.
Detection List (macos-online-security-check[.]com) Emsisoft (Phishing), Kaspersky (Phishing), Netcraft (Malicious), Full List Of Detections (VirusTotal)
Serving IP Address 176.119.28.70
Symptoms Your Mac becomes slower than normal, you see unwanted pop-up ads, you are redirected to dubious websites, you notice the presence of unwanted applications.
Distribution methods Deceptive pop-up ads, free software installers (bundling), fake Flash Player installers, torrent file downloads, potentially unwanted applications.
Damage Internet browser tracking (potential privacy issues), display of unwanted ads, redirects to dubious websites, loss of private information, financial losses.
Removal

To eliminate Macos-online-security-check.com virus 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.

There are many scam websites that are virtually identical to macos-online-security-check[.]com including, for example, apple.com-optimize[.]live, apple.com-clear[.]live, and apple.security-help-center[.]club. None of these websites should be trusted and the same applies to apps that they promote. All PUAs are similar. They are presented as useful and legitimate apps, however, if installed, they provide no real value and cause only problems (unwanted redirects, intrusive ads, and so on).

How did potentially unwanted applications install on my computer?

Most users download and install potentially unwanted apps inadvertently through intrusive ads that they intentionally (or accidentally) click, or together with other, usually free software. Developers often use the so-called "bundling" method to trick people into causing unwanted downloads and installations. This is achieved by hiding PUAs within "Advanced", "Custom" and other similar settings of other software set-ups. Typically, information regarding the bundling of apps within setups is not properly disclosed. Furthermore, many users skip software download/installation steps without checking the settings, which often leads to installation of PUAs.

How to avoid installation of potentially unwanted applications?

To prevent unwanted downloads and installations, download software (especially if it is free) from official websites and use direct download links. Avoid using third party software downloaders, installers, unofficial websites, Peer-to-Peer networks and other such tools to download (or install) software. Check "Custom", "Advanced", and other similar settings included in set-ups and dismiss offers to download or install any unwanted programs. Do not trust intrusive ads, since, once clicked, they usually redirect to untrustworthy websites, such as gambling, adult dating, pornography, and so on. If these ads or redirects appear without visiting any dubious pages or clicking dubious ads, check installed extensions, add-ons, and plug-ins on your browser and programs on your computer. Remove any unwanted apps/programs 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 presented in macos-online-security-check[.]com pop-up window:

IMMEDIATE ACTION REQUIRED
We have detected a trojan virus (e.tre456_worm_osx) on your Mac.
Press OK to begin the repair process.

Fake scan results displayed by macos-online-security-check[.]com:

macos-online-security-check[.]com fake scan results

Text presented in this page:

DOWNLOAD REQUIRED
Your Mac is heavily damaged! (33.2%)
Please download the Advanced Mac Cleaner application to remove 3 Viruses from your Mac.
VIRUS INFORMATION
Virus Name: Tapsnake; CronDNS; Dubfishicv
Risk: HIGH
Infected Files: /os/apps/hidden/os-component/X/snake.icv; /os/local/conf/keyboard/retype.icv...
REMOVE VIRUSES NOW
VIRUS REMOVAL
Application: Mac Speedup Pro
Rating: 9.9/10
Price: Free

Appearance of macos-online-security-check[.]com scam (GIF):

Appearance of macos-online-security-check[.]com  scam (GIF)

Mac Cleanup Pro application by this scam website:

Mac Cleanup Pro application promoted by scam website

Instant automatic removal of Macos-online-security-check.com virus: 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 Macos-online-security-check.com virus. 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 potentially unwanted applications promoted through macos-online-security-check[.]com scam website 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 "macos-online-security-check.com" virus 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.

"Macos-online-security-check.com" virus removal from Internet browsers:

safari browser iconRemove malicious extensions from Safari:

Remove "macos-online-security-check.com" virus 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 "macos-online-security-check.com" virus 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 "macos-online-security-check.com" virus 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
Macos-online-security-check.com virus 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 "Macos-online-security-check.com" virus on your mobile device.
We Recommend:

Get rid of Macos-online-security-check.com virus today:

▼ REMOVE IT NOW with Combo Cleaner for Mac

Platform: macOS

Editors' Rating for Combo Cleaner:
Editors ratingOutstanding!

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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.