Do not trust the "WIN.DLL011150 Error" scam

Also Known As: WIN.DLL011150 Error tech support scam
Damage level: Medium

What is the "WIN.DLL011150 Error" scam?

"WIN.DLL011150 Error" is a technical support scam promoted by various deceptive websites. This scheme has been observed being run on azurewebsites.net, though not exclusively. The "WIN.DLL011150 Error" scheme claims that the computer has been blocked due to the Windows registration key supposedly being illegal and the device having been compromised.

This scam attempts to trick people into exposing their registration keys and calling a fake 'tech support' number.

No site can detect threats/issues present on devices - any that make such claims are scams. Users rarely access these deceptive web pages intentionally - most are redirected to them by intrusive advertisements or Potentially Unwanted Applications (PUAs) already infiltrated into the system.

WIN.DLL011150 Error scam

The pop-up window presented on sites running the "WIN.DLL011150 Error" scam states that it is a "VIRUS ALERT TO Microsoft" with the error code specified as "WIN.DLL01150". Users are warned not to close this web page and/or restart their computers.

Their devices have been allegedly blocked for security reasons, as their Windows registration key have been found to be "illegal". Additionally, a window is supposedly hacked and/or controlled from an unspecified location, and it is proliferating viruses over the internet.

To regain access to their computers, users are urged to call the provided free technical support number and this instruction is repeated several times throughout the deceptive page. Furthermore, the "unusual activity" on the device can apparently pose a threat to stored data and financial activity.

The scheme also instructs users to enter their Microsoft registration key to unblock their computers. Note that all of the information provided by "WIN.DLL011150 Error" is false. Technical support scams are typically used to fool users into calling fake and expensive telephone numbers.

From there on, victims can be held on the line with nonsensical technobabble, while their telephone bill is racking up. Alternatively, the scammers can attempt to extort personal information (e.g. names, addresses, emails, banking account or credit card details, etc.) from users or gain access and control over their devices.

Another way that scammers can abuse users' trust is by requesting payment for "services rendered". In summary, trusting the "WIN.DLL011150 Error" scam can lead to system infections, financial loss, serious privacy issues and even identity theft. In some cases, closing the deceptive web page can be impossible.

In such instances, Task Manager must be used to end the browser process. When the browser is reopened, the previous process must not be restored, as the scam page will then be reopened.

As mentioned, one of the main causes of rogue redirects to untrusted/malicious websites are PUAs, however, these unwanted applications can have other capabilities. They can run ad campaigns (i.e., deliver unwanted and harmful advertisements). When clicked, these intrusive ads redirect to dubious/dangerous sites and can stealthily download/install rogue software (e.g. PUAs).

Another type of PUA can modify browsers, restrict/deny access to settings, and promote fake search engines. Most PUAs have data tracking capabilities. They can record browsing activity (URLs visited, pages viewed, search queries typed, etc.) and gather personal information derived from it (IP addresses, geolocations and other details).

The collected data is often monetized by sharing with third parties (potentially, cyber criminals) seeking to misuse it for profit. These unwanted apps pose a significant threat to device and user safety. Therefore, you are strongly advised to eliminate all suspect applications and browser extensions/plug-in immediately upon detection.

Threat Summary:
Name WIN.DLL011150 Error tech support scam
Threat Type Phishing, Scam, Social Engineering, Fraud.
Fake Claim Scam claims users' devices have been compromised and blocked.
Tech Support Scammer Phone Number +1-855-570-6839
Related Domains azurewebsites.net, chasxlogs34.xyz
Symptoms Fake error messages, fake system warnings, pop-up errors, hoax computer scan.
Distribution methods Compromised websites, rogue online pop-up ads, potentially unwanted applications.
Damage Loss of sensitive private information, monetary loss, identity theft, possible malware infections.
Malware Removal (Windows)

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"System Warning Alert", "Activation Security Warning", "Attention 22 threats found" and "ZoneAlarm Global Virus Alert" are some examples of other tech support scams. The Web is rife with various deceptive/scam websites. Technical support schemes are just one type.

Other popular scam models include (but are not limited to) fake prize giveaways, alerts that a piece of essential software is allegedly outdated, "unbelievable" offers/deals, and so on. Scams operate differently (they can make different requests, claims and demands), however, their purpose is identical: to generate revenue for the scammers/cyber criminals behind them.

How did potentially unwanted applications install on my computer?

PUAs are distributed via the download/installation set-ups of other software. This deceptive marketing tactic of pre-packing regular products with unwanted or malicious additions is called "bundling". Rushing downloads/installations (e.g. ignoring terms, skipping steps, using pre-set options, etc.) increases the risk of inadvertent installation of bundled content.

Some PUAs have "official" download web pages. Intrusive ads proliferate these applications as well. Once clicked, they can execute scripts to download/install PUAs without users' consent.

How to avoid installation of potentially unwanted applications

You are advised to research all products before download/installation or purchase. Use only official and verified download channels. Untrusted sources such as unofficial and free file-hosting sites, Peer-to-Peer sharing networks and third party downloaders commonly offer deceptive and/or bundled content.

When downloading/installing, it is important to read the terms, explore all available options, use the "Custom" or "Advanced" settings and opt-out of additional apps, tools, features, etc. Intrusive advertisements may seem legitimate and harmless, however, they can redirect to dubious websites (e.g. gambling, pornography, adult-dating and others).

If you encounter ads/redirects of this kind, check the system and immediately remove all suspicious applications and browser extensions/plug-ins. If your computer is already infected with PUAs, we recommend running a scan with Combo Cleaner Antivirus for Windows to automatically eliminate them.

Text presented in "WIN.DLL011150 Error" scam:

Windows Error Code : WIN.DLL01150


This computer is BLOCKED


Do not close this window 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 sending virus over the internet.
This window is hacked or used from undefined location.
We block this computer your security.
Contact Microsoft helpline to reactivate your computer.


Microsoft Security Tollfree +1-855-570-6839


Back to Safety

Microsoft Security Tollfree:

Prevent this page from creating additional dialogues.


Enter Microsoft registration key to unblock.


Microsoft Support Alert
Your System Detected Some Unusual Activity.
It might harm your computer data and track your financial activities.


Please report this activity to +1-855-570-6839


Ignore Alert
Leave This Page

The appearance of "WIN.DLL011150 Error" scam (GIF):

Appearance of WIN.DLL011150 Error scam

Another variant of "WIN.DLL011150 Error" pop-up scam:

WIN.DLL011150 Error pop-up scam

Instant automatic malware removal: Manual threat removal might be a lengthy and complicated process that requires advanced IT skills. Combo Cleaner is a professional automatic malware removal tool that is recommended to get rid of malware. Download it by clicking the button below:
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Quick menu:

How to identify a pop-up scam?

Pop-up windows with various fake messages are a common type of lures cybercriminals use. They collect sensitive personal data, trick Internet users into calling fake tech support numbers, subscribe to useless online services, invest in shady cryptocurrency schemes, etc.

While in the majority of cases these pop-ups don't infect users' devices with malware, they can cause direct monetary loss or could result in identity theft.

Cybercriminals strive to create their rogue pop-up windows to look trustworthy, however, scams typically have the following characteristics:

  • Spelling mistakes and non-professional images - Closely inspect the information displayed in a pop-up. Spelling mistakes and unprofessional images could be a sign of a scam.
  • Sense of urgency - Countdown timer with a couple of minutes on it, asking you to enter your personal information or subscribe to some online service.
  • Statements that you won something - If you haven't participated in a lottery, online competition, etc., and you see a pop-up window stating that you won.
  • Computer or mobile device scan - A pop-up window that scans your device and informs of detected issues - is undoubtedly a scam; webpages cannot perform such actions.
  • Exclusivity - Pop-up windows stating that only you are given secret access to a financial scheme that can quickly make you rich.

Example of a pop-up scam:

Example of a pop-up scam

How do pop-up scams work?

Cybercriminals and deceptive marketers usually use various advertising networks, search engine poisoning techniques, and shady websites to generate traffic to their pop-ups. Users land on their online lures after clicking on fake download buttons, using a torrent website, or simply clicking on an Internet search engine result.

Based on users' location and device information, they are presented with a scam pop-up. Lures presented in such pop-ups range from get-rich-quick schemes to fake virus scans.

How to remove fake pop-ups?

In most cases, pop-up scams do not infect users' devices with malware. If you encountered a scam pop-up, simply closing it should be enough. In some cases scam, pop-ups may be hard to close; in such cases - close your Internet browser and restart it.

In extremely rare cases, you might need to reset your Internet browser. For this, use our instructions explaining how to reset Internet browser settings.

How to prevent fake pop-ups?

To prevent seeing pop-up scams, you should visit only reputable websites. Torrent, Crack, free online movie streaming, YouTube video download, and other websites of similar reputation commonly redirect Internet users to pop-up scams.

To minimize the risk of encountering pop-up scams, you should keep your Internet browsers up-to-date and use reputable anti-malware application. For this purpose, we recommend Combo Cleaner Antivirus for Windows.

What to do if you fell for a pop-up scam?

This depends on the type of scam that you fell for. Most commonly, pop-up scams try to trick users into sending money, giving away personal information, or giving access to one's device.

  • If you sent money to scammers: You should contact your financial institution and explain that you were scammed. If informed promptly, there's a chance to get your money back.
  • If you gave away your personal information: You should change your passwords and enable two-factor authentication in all online services that you use. Visit Federal Trade Commission to report identity theft and get personalized recovery steps.
  • If you let scammers connect to your device: You should scan your computer with reputable anti-malware (we recommend Combo Cleaner Antivirus for Windows) - cyber criminals could have planted trojans, keyloggers, and other malware, don't use your computer until removing possible threats.
  • Help other Internet users: report Internet scams to Federal Trade Commission.

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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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Malware activity

Global malware activity level today:

Medium threat activity

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

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