System Has Detected Intrusion Scam

Also Known As: "System Has Detected Intrusion" virus
Type: Adware
Distribution: Low
Damage level: Medium

System Has Detected Intrusion removal instructions

What is System Has Detected Intrusion?

"System Has Detected Intrusion" is a fake error message displayed by a malicious website. Research shows that users visit this website inadvertently - they are redirected by various potentially unwanted programs (PUPs) that infiltrate systems during installation of other software (the "bundling" method). As well as causing redirects, PUPs also deliver intrusive online advertisements and continually record data relating to users' Internet browsing activity.

System Has Detected Intrusion adware

The "System Has Detected Intrusion" error message states that a number of DLL files are missing from the Windows folder. In addition, the system might be infected and, therefore, personal information (banking details, logins/passwords, etc.) is at risk. It states that the problem must be resolved immediately and users are encouraged to contact "certified technicians" via a telephone number ("+1-855-875-1671") provided. They are will then supposedly be guided through the malware removal process. Be aware, however, that, as mentioned above, the "System Has Detected Intrusion" error is fake. Cyber criminals attempt to scare and trick victims into calling, and paying for technical support that is not required. Therefore, you should never attempt to call the aforementioned telephone number. You can remove this error simply by closing the web browser. Furthermore, PUPs employ a "virtual layer" to generate coupon, pop-up, banner, and other similar ads. This is a tool that enables placement of third party graphical content on any site. Therefore, unwanted ads often conceal underlying content of visited websites, thereby significantly diminishing the web browsing experience. In addition, some redirect to malicious websites and even accidental clicks can result in high-risk adware or malware infections. Furthermore, PUPs continually gather various information that might be personally identifiable. The data (IP addresses, URLs visited, pages viewed, search queries, mouse/keyboard activity, geo-locations, etc.) is shared with third parties (potentially, cyber criminals) who generate revenue by misusing personal details. Therefore, the presence of data-tracking apps can lead to serious privacy issues or even identity theft. We strongly recommend that you uninstall all potentially unwanted programs immediately.

There are dozens of fake errors virtually identical to "System Has Detected Intrusion". Examples include (but are not limited to) Attempt To Tamper Data on This PC, Suspicious Activity From Your IP Address, Your Windows Has Been Banned, and Your System Might Be Infected. All claim that the system is damaged in certain ways, however, as with "System Has Detected Intrusion", these error messages are designed to trick users into paying for services that are not required. Potentially unwanted programs are deployed only to generate revenue for the developers. They often claim to enhance the Internet browsing experience by providing various 'useful features', however, rather than providing any value for regular users, PUPs cause unwanted redirects, gather personal information, and deliver intrusive advertisements.

How did adware install on my computer?

To promote potentially unwanted programs, developers use a deceptive marketing method called "bundling" - stealth installation of third party software with regular apps. Users often rush the download/installation processes and skip most steps. Therefore, bundled software is hidden within the "Custom/Advanced" settings. By skipping this section, users expose their systems to risk of various infections and compromise their privacy.

How to avoid installation of potentially unwanted applications?

Potentially unwanted programs are distributed using the "bundling" method. Therefore, never rush the download or installation processes. Choose the "Custom/Advanced" settings, observe each step, and decline offers to download/install additional applications.

Text presented within "System Has Detected Intrusion" error:

Warning: system has detected intrusion and root kits or some dll files are missing from c://windows
Please call urgent to Microsoft Certified Technician to get this problem at +1-855-875-1671
Do not ignore this critical alert. If you close this page, your computer access will be disabled to prevent
further damage to our network. You computer has alerted us that it has been infected with a virus and spyware.
The following information is being stolen… Facebook Logins, Credit Card Details, Email Account Login,
Photos stored on this computer. You must contact us immediately so that our engineers can walk you through the removal
process over the phone. Please call us within the next 5 minutes to prevent your computer from being disabled.
Toll Free +1-855-875-1671

Fake "System Has Detected Intrusion" error (GIF):

System Has Detected Intrusion pop-up error

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Quick menu:

Adware removal:

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 Has Detected Intrusion 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 program, scan your computer for any remaining unwanted components or possible malware infections. To scan your computer, use recommended malware removal software.

Remove adware from Internet browsers:

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

Internet Explorer logoRemove malicious add-ons from Internet Explorer:

Removing System Has Detected Intrusion ads 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 System Has Detected Intrusion ads from Internet Explorer step 2

Optional method:

If you continue to have problems with removal of the "system has detected intrusion" 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 System Has Detected Intrusion  ads from Google Chrome step 1

Click the Chrome menu icon Google Chrome options icon (at the top right corner of Google Chrome), select "Tools" and click "Extensions". Locate all recently-installed suspicious browser add-ons, select these entries and click the trash can icon.

Removing System Has Detected Intrusion ads from Google Chrome step 2

Optional method:

If you continue to have problems with removal of the "system has detected intrusion" 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 System Has Detected Intrusion ads 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 "Extensions", in the opened window, remove all recently-installed suspicious browser plug-ins.

Removing System Has Detected Intrusion ads from Mozilla Firefox step 2

Optional method:

Computer users who have problems with "system has detected intrusion" 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 has detected intrusion" 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 has detected intrusion" virus from your computer, please ask for assistance in our malware support forum.

Post a comment:
If you have additional information on "system has detected intrusion" virus or it's removal please share your knowledge in the comments section below.

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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Software uninstall instructions
Malware activity

Global malware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
System Has Detected Intrusion 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 Has Detected Intrusion" virus on your mobile device.
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