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Your System Detected Some Unusual Activity POP-UP Scam

Also Known As: "Your System Detected Some Unusual Activity" virus
Distribution: Moderate
Damage level: Medium

Your System Detected Some Unusual Activity removal instructions

What is Your System Detected Some Unusual Activity?

There are many fake error messages that are displayed when users visit deceptive/untrustworthy websites. These include "Your System Detected Some Unusual Activity", a fake virus alert message that is displayed in text format and also plays an audio message. Typically, people arrive at these deceptive websites unintentionally - they are redirected by potentially unwanted applications (PUAs). These apps infiltrate systems without users' direct permission, deliver intrusive ads, and record browsing-related information.

Your System Detected Some Unusual Activity scam

"Your System Detected Some Unusual Activity" is a fake virus alert designed to trick people into believing that there is unusual activity detected and the system is blocked due to the presence of a virus (or viruses). According to the alert, the computer is blocked due to the Windows registration key being illegal, there is illegal software installed, the user is proliferating viruses over the internet, or the system has been hacked and being used from an undefined location. Scammers behind the "Your System Detected Some Unusual Activity" fake message claim to be members of Windows Support and urge people to contact them via the +1-877-286-9666 telephone number. They state that detected viruses (or other unusual activity) might cause damage to the computer or result in financial data tracking. The main purpose of this fake virus alert message is to trick people into contacting scammers and paying for their services or products that will supposedly solve the problems. Note that statements about the presence of viruses on the system, possible financial data tracking activities, the computer being blocked, and so on, are false. These fake messages should never be trusted. The best solution is to simply ignore them by closing the deceptive browser window. Note that this fake virus alert window downloads files that crash the browser, rendering it unresponsive. This can make the fake error seem even more believable. If it prevents you from closing the browser, terminate the process using Task Manager, or simply restart the computer. In any case, do not reopen/restore the closed session, since this will return you to the same situation.

Most potentially unwanted apps that lead to deceptive websites deliver intrusive advertisements and collect browsing-related (and other) data. PUAs deploy coupons, banners, pop-ups, surveys, and so on, that are displayed using tools that enable placement of third party graphical content on any site. Therefore, they are annoying, since they conceal underlying content of any visited website. Furthermore, when clicked, they often lead to other untrustworthy websites or even execute scripts designed to download/install other PUAs. These apps often record data, such as IP addresses, keystrokes, URLs of visited websites, search queries, and also personal data. Their developers share the data with third parties (potentially, cyber criminals) who misuse it to generate revenue. In summary, having unwanted apps installed leads to redirects to deceptive websites, privacy risks, browsing issues, computer infections, and even identity theft.

Threat Summary:
Name "Your System Detected Some Unusual Activity" virus
Threat Type Phishing, Scam, Social Engineering, Fraud
Cyber Criminals' Phone Number +1-877-286-9666, +1-877-635-8489
Symptoms Unauthorized online purchases, changed online account passwords, identity theft, illegal access of one's computer.
Distribution methods Deceptive emails, rogue online pop-up ads, search engine poisoning techniques, misspelled domains.
Damage Loss of sensitive private information, monetary loss, identity theft.
Malware Removal (Windows)

To eliminate possible malware infections, scan your computer with legitimate antivirus software. Our security researchers recommend using Malwarebytes.
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To use full-featured product, you have to purchase a license for Malwarebytes. 14 days free trial available.

Some other examples of fake messages are This Computer Is Blocked, MS MALWARE ALERT and Your Computer Was Locked. Most of these fake messages are very similar. Typically, scammers use them to trick people into purchasing products or services that, according to them, remove viruses, fix computer problems, and so on. PUAs share an identical purpose: to generate revenue for their developers by gathering data, causing unwanted redirects, and feeding users with intrusive ads.

How did potentially unwanted applications install on my computer?

In some cases, unwanted apps can be downloaded from their official websites, however, most people install them unintentionally by clicking intrusive advertisements or together with other software. Frequently, users are tricked into installing unwanted apps when software developers use "bundling", a deceptive marketing method used to trick users into installing PUAs by hiding them in "Custom", "Advanced" and other similar settings. Generally, information about the inclusion of unwanted apps within the installation/download set-ups is not properly disclosed, however, these inadvertent installations/downloads are achieved only when users skip installation/download steps and leave the available settings unchanged. In this way, users give permission to install/download PUAs.

How to avoid installation of potentially unwanted applications?

Do not use third party software downloaders, installers, or other similar sources to download apps - use official and trustworthy sources/websites, and direct links. Never skip installation/download steps, check "Custom"/"Advanced" settings and deselect offers to install additional software/applications. Avoid clicking intrusive ads, especially when visiting dubious/untrustworthy websites. If you are redirected to untrustworthy websites (such as pornography, adult dating, gambling, and so on), check installed extensions, plug-ins, and add-ons on your browser and remove all suspicious entries. Also remove unwanted programs from your operating system. If your computer is already infected with PUAs, we recommend running a scan with Malwarebytes for Windows to automatically eliminate them.

Text presented in "Your System Detected Some Unusual Activity" pop-up:

VIRUS ALERT FROM MICROSOFT
This computer is BLOCKED
Do not close this windows and restart your computer
Your computer's registration key is Blocked.
Why we blocked your computer?
The window's registration key is illegal.
This window is using pirated software.
this window is sending virus over the Internet.
This window is hacked or used from undefined location.
We block this computer for your security
Contact microsoft helpline to reactivate your computer.

The appearance of "Your System Detected Some Unusual Activity" pop-up (GIF):

Your System Detected Some Unusual Activity scam gif

Text presented in "Your System Detected Some Unusual Activity" website's background: 

Windows Support Alert
Your System Detected Some Unusual Activity
It might harm your computer data and track your financial activities
Please report this activity to +1-877-286-9666
[Ignore Alert] [Chat Now]

Another variant of "Your System Detected Some Unusual Activity" pop-up scam:

Your System Detected Some Unusual Activity pop-up scam (2021-03-26)

Text presented within this pop-up:

Why we blocked your computer?

Your System Detected Some Unusual Activity.

Call Helpline 1-877-635-8489 (Toll Free)

[Quick Helpline] [Go Back Safety]

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.

Your System Detected Some Unusual Activity 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 "your system detected some unusual activity" 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 "your system detected some unusual activity" 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 "your system detected some unusual activity" 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 "your system detected some unusual activity" 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 "your system detected some unusual activity" virus from your computer, please ask for assistance in our malware support forum.

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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
Your System Detected Some Unusual Activity 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 "Your System Detected Some Unusual Activity" virus on your mobile device.
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