WARNING CRITICAL MESSAGE – a fake error message that could lead to malware infections

WARNING CRITICAL MESSAGE is a tech support scam that shows up on Google Chrome or another browser and claims that the Windows can't continue working due to suspicious activity. Users are urged to contact Windows support immediately by calling a toll-free +1-888-357-5053 number.
Many scamming websites imitate Windows and other company websites to trick people into believing the threat is real. When users call the given numbers, they might be asked to give remote access to their device or buy some software required to fix the issues.
Furthermore, threat actors behind WARNING CRITICAL MESSAGE error claim that if the window is closed, the computer will not work and that the imaginary threat is capable of stealing passwords, credit card info, files from the computer, etc.
Never call any numbers that fake sites ask you to. If you did call the threat actors and gave them access to your device, then you came to the right place. Our cybersecurity experts have compiled a list of instructions on how to delete this threat and any other possible malware that could have been sent to your device if you've allowed remote access to scammers from this site.
| name | WARNING CRITICAL MESSAGE |
|---|---|
| Type | Tech support scam, phishing |
| Imitated site | Microsoft website |
| IP address | 172.67.182.40 |
| Fake Tech support scam phone number | +1-888-357-5053 |
| Error message | Windows has been blocked due to suspicious activity |
| Symptoms | Pop-up errors, fake system warning messages, fake error messages |
| Risks | If remote access is given, malware can be planted on the device. Also, each file can be copied, and sensitive information such as personal details, stolen |
| Removal | Follow our guides at the bottom of this article on how to eliminate this threat. Anti-malware software should be used to make sure no malicious files were downloaded |
| System repair | To fix corrupted system files and settings with a push of a button, use the FortectIntego system repair tool |
Users might have been redirected to the site where WARNING CRITICAL MESSAGE fake error message struck out of nowhere by clicking on a deceptive ad, visiting other shady portals, having potentially unwanted programs (browser hijackers, adware,[1] etc.) installed on their device, or by some other sneaky method.
The main thing when such a message appears is not to panic. Please remember that websites can't determine if you have a virus infection or that your software is out of data and need updates. All technical error messages received while browsing the internet are a scam.
Tech support scam WARNING CRITICAL MESSAGE is made out of two messages. One can be seen as a pop-up window and states:
Contact-Windows-Support: +1-888-357-5053
Please call us: +1-888-357-5053
Program Defender.exe
Verified Publisher: Windows-Defender
Necessary measures: Contact us immediately so that our technicians can guide you through the process of removing the Phone can lead. Please call us within 5 minutes to prevent Your Computer will be disabled.
Quick Help
Go Back Safety
Prevent additional dialogs.
+1-888-357-5053
The other one is displayed in the background, claiming that:
** WARNING-CRITICAL-MESSAGE**
Error # MSWindows-77X1
Contact-Windows-Support: +1-888-357-5053 :
Do not ignore this important warning
Windows was blocked due to suspicious activity. Please call us within 5 Minutes to prevent your Computer from being deactivated. The following information may be lost:1. Passwords
2. Browsing History
3. Sensitive information (credit cards)
4. Files on the hard driveDo not ignore this critical warning if you close this page, your Computer access disabled to prevent further damage to our network .
Contact-Windows-Support:
+1-888-357-5053

None of these claims are true. By calling the given scam number and giving remote access to a device, users are risking that either (or all) of these scenarios are could come to life:
- Money is asked for imaginary tech support, i.e., fixing the imaginary system issue
- Potentially unwanted programs are installed on the device
- Malware, such as ransomware, Trojans,[2] or any other kind, is planted
- Sensitive information, such as personal details, credit card info, and any other valuable information, is stolen
- Various files deleted or copied.
In case WARNING CRITICAL MESSAGE scam freezes the browser window and prevents from closing it, users have to open the Task Manager. You can do that either by clicking the right mouse button on the taskbar and choosing Task Manager or by pressing CTRL + SHIFT + ESC on your keyboard.
Afterward, choose the browser you were using when it got frozen and press the right mouse button on it. Then click End Task. The browser should be closed, and the error messages should have disappeared. When the next time you launch the browser, don't go for the “reopen last session”, “open closed tabs”, or any other option that would reopen WARNING CRITICAL MESSAGE tech support scam virus.
If you've allowed remote access to your device to the scam artists, then you will have to scan your device with reliable anti-malware tools such as SpyHunterCombo Cleaner or MalwarebytesMalwarebytes to remove WARNING CRITICAL MESSAGE. Keep either of these apps up-to-date so they could prevent such perils in the future.
Cybersecurity specialists at LesVirus.fr[3] highly recommend doing a system tune-up to fix any corrupted files. The best way to it is by using the FortectIntego system repair tool. Download it and run system diagnostics. Once any issues are detected, the app will take care of them with a push of a button.
Instructions to increase cybersecurity level to avoid malware and scam pages
Malware has been circulating the internet for over two decades. Since then, it has evolved into a large, illegal business. Different kinds of malware and scams are constantly being created. Various social engineering techniques are used to fool everyday computer users. Even tech-savvy people can get tricked into downloading malicious files.
Our IT experts decided to compile a simple tutorial on how to increase cybersecurity level. If these guidelines are followed, then it will be much harder for cybercriminals to profit off you:
- Operating software and installed applications must have the latest available updates installed as soon as their developed (except for BETA versions)
- Trustworthy, professional anti-malware software must be installed on any device that's regularly used to connect to the internet
- Backups of all essential information must be kept on at least two separate devices, e.g., cloud, USB drive, external storage
- System repair tools must be used frequently to maintain the overall health of the system
- Download software only from legitimate distributors, stay away from torrent sites, illegal vendors, and other shady websites
- When some sort of an error, ransom note, or other malware indications are spotted, users must stay calm and don't make any rash decisions. Visit cybersecurity pages and find out how to deal with the issue.
Remove WARNING CRITICAL MESSAGE from your device
First and foremost, none of the claims that WARNING CRITICAL MESSAGE tech scam displays are true. Websites, no matter how identical they look to legitimate tech support sites, can't determine whether something is wrong with your device or not.
Remove WARNING CRITICAL MESSAGE by opening Task Manager and ending the task of the browser. However, if your browser works normally, closing down the tab the scam is displayed on will suffice.
To ensure that no malware was installed on your device, it's highly recommended to perform a full system scan with professional anti-malware tools. This type of software will take care of WARNING CRITICAL MESSAGE removal from your system if such a threat is present.
Please don't forget to use system repair tools to take care of the device's overall health. Corrupted, edited, or in any other way, modified system settings and files could lead to various system irregularities, such as severe lag, performance loss, crashing, freezing, etc.
Uninstall from Windows
Uninstall from Windows 10/8:
- Type Control Panel into the Windows search box and open the result.
- Under Programs, select Uninstall a program.

Uninstall from Windows 7/XP:
- Click on Windows Start > Control Panel (Windows XP users should click on Add/Remove Programs).
- In Control Panel, select Programs > Uninstall a program.

Remove the unwanted program:
- In the Programs and Features window, look for any recently installed suspicious entries, select them, and click Uninstall.
- If User Account Control appears, click Yes to confirm, then complete the removal.

Delete from macOS
Remove the unwanted application:
- From the menu bar, select Go > Applications.
- In the Applications folder, look for any suspicious entries, then drag them to Trash (or right-click and pick Move to Trash).

Delete leftover files and folders:
- Select Go > Go to Folder.
- Enter /Library/Application Support and remove any suspicious folders related to the unwanted program.
- Repeat the same check in the /Library/LaunchAgents and /Library/LaunchDaemons folders, deleting any suspicious entries.

- Finally, empty the Trash to permanently remove the leftovers.
Reset Internet Explorer
Remove dangerous add-ons:
- Open Internet Explorer, click on the Gear icon (IE menu) on the top-right corner of the browser
- Pick Manage Add-ons.
- You will see a Manage Add-ons window. Here, look for suspicious plugins. Click on these entries and select Disable.

Change your homepage if it was altered:
- Open IE and click on the Gear icon.
- Select Internet Options.
- In the General tab, delete the Home page address and replace it by your preferred one (for example, Google.com).
- Click Apply and then select OK.

Delete temporary files:
- Press on the Gear icon and select Internet Options.
- Under Browsing history, click Delete...
- Select relevant fields and press Delete.

Reset Internet Explorer:
- Click on Gear icon > Internet options and select Advanced tab.
- Select Reset.
- In the new window, check Delete personal settings and select Reset.

Remove from Microsoft Edge
Delete unwanted extensions from MS Edge:
- Select Menu (three horizontal dots at the top-right of the browser window) and pick Extensions.
- From the list, pick the extension and click on the Gear icon.
- Click Remove.

Clear cookies and other browser data:
- Click on the Menu (three horizontal dots at the top-right of the browser window) and select Settings > Privacy, search, and services..
- Under Clear browsing data, pick Choose what to clear.
- Select Cookies and other site data and Cached images and files. (apart from passwords, although you might want to include Media licenses as well, if applicable) and click on Clear.

Restore new tab and homepage settings:
- Click the menu icon and choose Settings.
- Then find On startup section.
- Click Remove next to any suspicious startup page.
Reset MS Edge if the above steps did not work:
- Press on Ctrl + Shift + Esc to open Task Manager.
- Click on More details arrow at the bottom of the window.
- Select Details tab.
- Now scroll down and locate every entry with Microsoft Edge name in it. Right-click on each of them and select End Task to stop MS Edge from running.

Instructions for Chromium-based Edge
Delete extensions from MS Edge (Chromium):
- Open Edge and click select Settings > Extensions.
- Delete unwanted extensions by clicking Remove.

Clear cache and site data:
- Click on Menu and go to Settings.
- Select Privacy, search and services.
- Under Clear browsing data, pick Choose what to clear.
- Under Time range, pick All time.
- Select Clear now.

Reset Chromium-based MS Edge:
- Click on Menu and select Settings.
- On the left side, pick Reset settings.
- Select Restore settings to their default values.
- Confirm with Reset.
- This will disable extensions and reset startup pages but will not delete bookmarks, saved passwords, or browsing history.

Remove from Mozilla Firefox (FF)
Remove dangerous extensions:
- Open Mozilla Firefox browser and click on the Menu (three horizontal lines at the top-right of the window).
- Select Add-ons.
- In here, select the unwanted extension and click Remove.

Reset the homepage:
- Click three horizontal lines at the top right corner to open the menu.
- Choose Settings.
- Under Home, set your preferred homepage and new tab settings.
Clear cookies and site data:
- Click Menu and pick Settings.
- Go to Privacy & Security section.
- Scroll down to locate Cookies and Site Data.
- Click on Clear Data...
- Select Cookies and Site Data and Temporary cached files and pages, then click Clear.

Reset Mozilla Firefox
If clearing the browser as explained above did not help, reset Mozilla Firefox:
- Open Mozilla Firefox browser and click the Menu.
- Go to Help and then choose Troubleshooting Information.

- Under Give Firefox a tune up section, click on Refresh Firefox...
- Once the pop-up shows up, confirm the action by pressing on Refresh Firefox.

Remove from Google Chrome
Delete malicious extensions from Google Chrome:
- Open Google Chrome, click on the Menu (three vertical dots at the top-right corner) and select More tools > Extensions.
- In the newly opened window, you will see all the installed extensions. Uninstall all suspicious extensions related to the unwanted program by clicking Remove.

Clear cache and web data from Chrome:
- Click on Menu and pick Settings.
- Under Privacy and security, select Clear browsing data.
- Select Browsing history, Cookies and other site data, as well as Cached images and files.
- Click Clear data.

Change your homepage:
- Click menu and choose Settings.
- Look for a suspicious site in the On startup section.
- Click on Open a specific or set of pages and click on three dots to find the Remove option.
Reset Google Chrome:
If the previous methods did not help you, reset Google Chrome to eliminate all the unwanted components:
- Click on Menu and select Settings.
- In the Settings, scroll down and click Advanced.
- Scroll down and locate Reset and clean up section.
- Now click Restore settings to their original defaults.
- Confirm with Reset settings.

Delete from Safari
Remove dangerous extensions:
- Open Safari, click Safari in the menu at the top-left of the screen, and select Preferences.
- Go to the Extensions tab, look for any suspicious entries, and click Uninstall to remove them.

Clear history and website data:
- Click Safari in the menu and pick Clear History.
- Set Clear to all history and confirm with Clear History.

Reset Safari:
- Click Safari in the menu and select Preferences > Advanced.
- Enable Show Develop menu in menu bar.
- From the menu bar, click Develop and select Empty Caches.

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