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Client-side threat detection: how Scareware blocker uncovered malicious notification abuse

By · Published by Everything Blog

In short

Microsoft Edge 156 automatically disables alerts from domains detected pushing scams via Microsoft Defender SmartScreen or its built-in Scareware blocker. An information bar alerts users to these automatic blocks upon their next browser launch, while settings still permit manual reviews and unblocking. Users can also utilize a new "Block and report" feature on initial permission prompts to send suspicious URLs and screenshots directly to SmartScreen. Manual notification menus remain available to halt evasive alerts without clicking confusing buttons that launch extra windows.

Key points

  • Browser notifications used to deliver deceptive virus alerts are automatically halted usi…: Browser notifications used to deliver deceptive virus alerts are automatically halted using integrated security tools.
  • Users receive an alert banner upon launching the browser and keep the ability to manually…: Users receive an alert banner upon launching the browser and keep the ability to manually adjust permissions.
  • Direct reporting of suspicious permission prompts helps reinforce cloud-based threat dete…: Direct reporting of suspicious permission prompts helps reinforce cloud-based threat detection for all platform users.

Sources checked by our analysis pipeline: 1

Website notifications were designed to help us stay informed. They can alert you to a new message, remind you of an upcoming event, or share an important update from a service you trust.

But scammers are turning this useful browser feature into a persistent channel for fake virus warnings, security alerts, and other scams. They take advantage of our busy lives to persuade us to allow notifications from malicious sites. Selecting “Allow” can give a malicious site repeated opportunities to send fake virus warnings and deceptive security alerts. Even after you close the original page, notifications can lead back to the scam again and again.

Edge has been fighting notification spam for years and there are multiple workstreams actively detecting and blocking them by the billions. But now we’re improving protections using intelligence in the Edge browser and making it easier to report scams.

How Scareware reports uncovered malicious notification abuse

Enabled by default on qualifying PCs for just over a year, Scareware blocker in Edge directly protects tens of thousands of users per day against new scams. But Scareware…

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