System Firewall Has Blocked Some Features POP-UP Scam

Also Known As: "System Firewall Has Blocked Some Features" virus
Distribution: Low
Damage level: Medium

System Firewall Has Blocked Some Features removal instructions

What is System Firewall Has Blocked Some Features?

"System Firewall Has Blocked Some Features" is a fake security alert message similar to many other fake messages such as The System Is Badly Damaged, Install Java To Continue, Microsoft Support, etc. Generally, these are delivered by untrustworthy and deceptive websites that users visit inadvertently. Most users arrive at them via potentially unwanted applications (PUAs) or intrusive ads. PUAs are often installed unintentionally in the first place, and cause unwanted redirects, deliver ads, and record browsing-related data.

System Firewall Has Blocked Some Features scam

According to the "System Firewall Has Blocked Some Features" fake security alert message, your system has detected suspicious activity. It claims that a firewall has blocked some/all features of an executable application called "Csrss". This fake message advises you to prevent this application from accessing files or settings, however, it points out that there are problems with the 'security on your system' and urges you to contact Microsoft technicians via the telephone number: +1 (855) 966 0966. It also states that you should not open other browsers or browser windows if you want to avoid data or registry corruption. They advise users to take no action other than to call the "certified technicians" immediately. Most scammers (developers of these fake messages) claim to be helpful and attempt to trick people into contacting them. Their only purpose is to trick people into paying for services or products that will supposedly solve problems (in this case, the security problem). Microsoft employees (technicians) have nothing to do with this scam. Ignore all requests to contact anyone by the telephone number. Simply close the window/website. If the website prevents you from closing it, terminate the entire browser process using Task Manager or restart your computer. Do not restore the previous browsing session the next time you open your browser - this will lead you to an identical fake security alert scam.

As well as redirects to these websites, potentially unwanted applications deliver intrusive advertisements. These are displayed through tools that enable placement of third party graphical content on any site. They often conceal underlying content of any visited website, thereby diminishing the browsing experience. Once clicked, they redirect people to potentially malicious websites or execute scripts designed to download and install other PUAs or even malware. Another downside of such applications is information tracking. they collect browsing-related data, such as IP addresses, keystrokes, URLs of visited websites, search queries, etc. Some of the data will contain sensitive (personal) information that PUA developers later share with third parties (who misuse private data to generate revenue). These actions put users at risk of various security/privacy issues, or even identity theft. You are advised to eliminate all installed PUAs immediately.

Threat Summary:
Name"System Firewall Has Blocked Some Features" virus
Threat TypePhishing, Scam, Social Engineering, Fraud
SymptomsUnauthorized online purchases, changed online account passwords, identity theft, illegal access of one's computer.
Distribution methodsDeceptive emails, rogue online pop-up ads, search engine poisoning techniques, misspelled domains.
DamageLoss of sensitive private information, monetary loss, identity theft.
Malware Removal (Windows)

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All fake messages (alerts, errors, etc.) are very similar. Typically, they inform users of 'serious problems' and attempt to trick them into paying for solutions to fix nonexistent problems. Most PUAs are also very similar - their developers promote them as useful and capable of providing various features, however, these are only attempts to trick users into downloading and installing them. Few PUAs are legitimate or provide the features promised. They are designed only to generate revenue for their developers, and provide no real value for regular users.

How did potentially unwanted applications install on my computer?

Most potentially unwanted applications have official websites from which they can be downloaded free of charge, however, users often install them by clicking intrusive ads or when software developers use the so-called "bundling" method. Bundling is a deceptive marketing method used by software developers to install potentially unwanted applications with other regular software. Developers usually do not disclose information about bundled apps properly and hide them in "Custom"/"Advanced" options or other settings of the installation processes. Many users skip installation steps without paying attention to the details, thus allowing inadvertent installation of PUAs. This careless behaviour often leads to even more serious problems such as computer infections and privacy issues.

How to avoid installation of potentially unwanted applications?

Do not download software from untrustworthy websites, using third party software downloaders, or torrents. Use only official, trustworthy websites, and direct links. Pay close attention to the installation details. Do not skip installation steps without checking all available "Custom", "Advanced" and other similar options. Decline offers to install various PUAs and only then finish the installation process. Avoid clicking suspicious (intrusive) ads - they may seem legitimate (cyber criminals invest time and money into rogue advertisement design), however, once clicked, they usually redirect to untrustworthy websites (adult dating, pornography, gambling, etc.). If you encounter these redirects, check all extensions, add-ons, and plug-ins installed on your browser (or programs on your computer) and uninstall any dubious and unwanted entries immediately. If your computer is already infected with PUAs, we recommend running a scan with Malwarebytes for Windows to automatically eliminate them.

The appearance of the first "System Firewall Has Blocked Some Features" pop-up:

systemfirewall-popup

Text presented in the first "System Firewall Has Blocked Some Features" pop-up:

System Security Alert

 

System Firewall has blocked some or all features of this program

 

System Firewall has blocked some features of the following application from execution on this computer.
Name: Csrss.exe
Publisher: Unknown
Path: %Systemroot%\windows\system32\csrss.exe

 

Allow this application to access :
Operating System Security Settings
File System (Documents, Pictures etc.)
Network Settings
Remote Protocol
Saved Passwords
Secure Date (Banking or Credit Card Details)

 

What are the risks of allowing a program through a firewall?

Text presented in the second "System Firewall Has Blocked Some Features" pop-up:

Customer, your system has detected possible Suspicious Activity.

Please call the toll-free number below for a Microsoft-Certified technician to help you resolve the issue:
+1 (855) 966 0966

For your safety, please do not open Internet browser to avoid data corruption to the registry of your operating system.

Please contact support at the toll-free Helpline +1 (855) 966 0966

PLEASE DO NOT SHUT DOWN OR RESTART THE COMPUTER, DOING THAT MAY LEAD TO DATA LOSS AND POSSIBLE FAILIURE OF THE OPERATING SYSTEM, AND POTENTIAL NON BOOTABLE SITUATION RESULTING IN COMPLETE DATA LOSS. CONTACT MICROSOFT CERTIFIED TECHNICIANS TO RESOLVE THE ISSUE CALLING TOLL FREE - +1 (855) 966 0966

Tollfree Helpline: +1 (855) 966 0966
Customer, your system has detected possible Suspicious Activity.
Please call the toll-free number below for a Microsoft-Certified technician to help you resolve the issue:
+1 (855) 966 0966
For your safety, please do not open internet browser to avoid data corruption ...

The appearance of "System Firewall Has Blocked Some Features" pop-up scam (GIF):

System Firewall Has Blocked Some Features scam gif

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Malwarebytes is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
▼ DOWNLOAD Malwarebytes 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 Malwarebytes. 14 days free trial available.

Quick menu:

Removal of potentially unwanted applications:

Windows 7 users:

Accessing Programs and Features (uninstall) in Windows 7

Click Start (Windows Logo at the bottom left corner of your desktop), choose Control Panel. Locate Programs and click Uninstall a program.

Windows XP users:

Accessing Add or Remove Programs in Windows XP

Click Start, choose Settings and click Control Panel. Locate and click Add or Remove Programs.

Windows 10 and Windows 8 users:

Accessing Programs and Features (uninstall) in Windows 8

Right-click in the lower left corner of the screen, in the Quick Access Menu select Control Panel. In the opened window choose Programs and Features.

Mac OSX users:

Uninstall app in OSX (Mac)

Click Finder, in the opened screen select Applications. Drag the app from the Applications folder to the Trash (located in your Dock), then right click the Trash icon and select Empty Trash.

System Firewall Has Blocked Some Features adware uninstall via Control Panel

In the uninstall programs window, look for any suspicious/recently-installed applications, select these entries and click "Uninstall" or "Remove".

After uninstalling the potentially unwanted application, scan your computer for any remaining unwanted components or possible malware infections. To scan your computer, use recommended malware removal software.

Remove rogue extensions from Internet browsers:

Video showing how to remove potentially unwanted browser add-ons:

Internet Explorer logoRemove malicious add-ons from Internet Explorer:

Removing rogue extensions from Internet Explorer step 1

Click the "gear" icon Internet Explorer options icon (at the top right corner of Internet Explorer), select "Manage Add-ons". Look for any recently-installed suspicious browser extensions, select these entries and click "Remove".

Removing rogue extensions from Internet Explorer step 2

Optional method:

If you continue to have problems with removal of the "system firewall has blocked some features" virus, reset your Internet Explorer settings to default.

Windows XP users: Click Start, click Run, in the opened window type inetcpl.cpl In the opened window click the Advanced tab, then click Reset.

Resetting Internet Explorer settings to default on Windows XP

Windows Vista and Windows 7 users: Click the Windows logo, in the start search box type inetcpl.cpl and click enter. In the opened window click the Advanced tab, then click Reset.

Resetting Internet Explorer settings to default on Windows 7

Windows 8 users: Open Internet Explorer and click the gear icon. Select Internet Options.

Reseting Internet Explorer settings to default in Windows 8 - accessing

In the opened window, select the Advanced tab.

Resetting Internet Explorer settings to default on Windows 8 - Internet options advanced tab

Click the Reset button.

Resetting Internet Explorer settings to default on Windows 8 - click the Reset button in the Internet options advanced tab

Confirm that you wish to reset Internet Explorer settings to default by clicking the Reset button.

Resetting Internet Explorer settings to default on Windows 8 - confirm settings reset to default by clicking the reset button

Google Chrome logoRemove malicious extensions from Google Chrome:

Removing rogue extensions from 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 browser add-ons and remove them.

Removing rogue extensions from Google Chrome step 2

Optional method:

If you continue to have problems with removal of the "system firewall has blocked some features" virus, reset your Google Chrome browser settings. Click the Chrome menu icon Google Chrome menu icon (at the top right corner of Google Chrome) and select Settings. Scroll down to the bottom of the screen. Click the Advanced… link.

Google Chrome settings reset step 1

After scrolling to the bottom of the screen, click the Reset (Restore settings to their original defaults) button.

Google Chrome settings reset step 2

In the opened window, confirm that you wish to reset Google Chrome settings to default by clicking the Reset button.

Google Chrome settings reset step 3

Mozilla Firefox logoRemove malicious plug-ins from Mozilla Firefox:

Removing rogue extensions from Mozilla Firefox step 1

Click the Firefox menu firefox menu icon (at the top right corner of the main window), select "Add-ons". Click on "Extensions", in the opened window, remove all recently-installed suspicious browser plug-ins.

Removing rogue extensions from Mozilla Firefox step 2

Optional method:

Computer users who have problems with "system firewall has blocked some features" virus removal can reset their Mozilla Firefox settings.

Open Mozilla Firefox, at the top right corner of the main window, click the Firefox menu, firefox menu icon in the opened menu, click Help.

Accessing settings (Reset Firefox to default settings step 1)

Select Troubleshooting Information.

Accessing Troubleshooting Information (Reset Firefox to default settings step 2)

In the opened window, click the Refresh Firefox button.

Clicking on Refresh Firefox button (Reset Firefox to default settings step 3)

In the opened window, confirm that you wish to reset Mozilla Firefox settings to default by clicking the Refresh Firefox button.

Confirm your want to reset Firefox settings to default (Reset Firefox to default settings step 4)

safari browser logoRemove malicious extensions from Safari:

removing adware from safari step 1 - accessing preferences

Make sure your Safari browser is active, click Safari menu, and select Preferences....

removing adware from safari step 2 - removing extensions

In the opened window click Extensions, locate any recently installed suspicious extension, select it and click Uninstall.

Optional method:

Make sure your Safari browser is active and click on Safari menu. From the drop down menu select Clear History and Website Data...

resetting safari step 1

In the opened window select all history and click the Clear History button.

resetting safari step 2

Microsoft Edge (Chromium) logoRemove malicious extensions from Microsoft Edge:

Removing adware from Microsoft Edge step 1

Click the Edge menu icon Microsoft Edge (chromium) menu icon (at the upper-right corner of Microsoft Edge), select "Extensions". Locate all recently-installed suspicious browser add-ons and click "Remove" below their names.

Removing adware from Microsoft Edge step 2

Optional method:

If you continue to have problems with removal of the "system firewall has blocked some features" virus, reset your Microsoft Edge browser settings. Click the Edge menu icon Microsoft Edge (chromium) menu icon (at the top right corner of Microsoft Edge) and select Settings.

Microsoft Edge (Chromium) reset step 1

In the opened settings menu select Reset settings.

Microsoft Edge (Chromium) reset step 2

Select Restore settings to their default values. In the opened window, confirm that you wish to reset Microsoft Edge settings to default by clicking the Reset button.

Microsoft Edge (Chromium) reset step 3

  • If this did not help, follow these alternative instructions explaining how to reset the Microsoft Edge browser.

Summary:

declining installation of adware while downloading free software sampleCommonly, adware or potentially unwanted applications infiltrate Internet browsers through free software downloads. Note that the safest source for downloading free software is via developers' websites only. To avoid installation of adware, be very attentive when downloading and installing free software. When installing previously-downloaded free programs, choose the custom or advanced installation options – this step will reveal any potentially unwanted applications listed for installation together with your chosen free program.

Removal assistance:
If you are experiencing problems while trying to remove "system firewall has blocked some features" virus from your computer, please ask for assistance in our malware support forum.

Post a comment:
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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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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
System Firewall Has Blocked Some Features 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 "System Firewall Has Blocked Some Features" virus on your mobile device.
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