Security Policy Errors

Can Microsoft Defender Detect QR Code Phishing Emails?

Camila Milosovich Oct 12, 2026 869 views

Question details

Determine if Microsoft Defender for Office 365 is capable of detecting and blocking malicious QR codes embedded in image-only phishing emails.

Can Microsoft Defender Detect QR Code Phishing Emails?

Product: Microsoft Defender for Office 365
Device & OS: not provided
Scenario: Receiving suspicious image-only emails containing QR codes designed to bypass standard text-based security filters.
Observed behavior: Image-only phishing emails containing QR codes (quishing) may bypass standard anti-phishing filters and successfully reach users' inboxes.

Before you start

Ensure you have administrative access to your Microsoft 365 Defender portal and Exchange admin center to review and modify organization-wide security policies.

Solution 1Recommended

Configure Microsoft Defender Policies to Block QR Code Phishing

Utilize Microsoft Defender for Office 365's advanced capabilities and establish strict mail-flow rules to mitigate the risk of QR code phishing (quishing).

Microsoft Defender for Office 365 continually updates its capabilities to extract and scan URLs from images, including QR codes. However, because image-only emails lack text context, they can sometimes bypass standard filters. Applying strict anti-phishing policies and user reporting controls is essential to minimize this risk.

Access the Microsoft 365 Defender Portal

Log in to the Microsoft 365 Defender portal at security.microsoft.com using your global or security administrator credentials.

Review Anti-Phishing Policies

Navigate to 'Email & collaboration' > 'Policies & rules' > 'Threat policies' > 'Anti-phishing'. Ensure that advanced machine learning models and image-scanning features are actively enabled for your organization.

Set Up Mail Flow Rules

Open the Exchange admin center. Create a new mail-flow (transport) rule that flags, quarantines, or prepends a warning to external emails that consist solely of images and have little to no body text.

Enable User Reporting Controls

Deploy the 'Report Message' or 'Report Phishing' add-in for Outlook. This allows employees to easily flag suspicious QR code emails, helping Microsoft Defender improve its detection algorithms.

Configure Microsoft Defender Policies to Block QR Code Phishing

Community Support: For specialized guidance on advanced threat protection and custom configurations, post your questions in the dedicated Microsoft Defender for Office community.

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Frequently Asked Questions

What is QR code phishing (quishing)?

QR code phishing, often referred to as 'quishing', is a technique where attackers embed malicious URLs inside a QR code placed within an email. Because the link is hidden inside an image rather than text, traditional email filters may fail to detect and block it.

Does Microsoft Defender scan images for malicious URLs?

Yes, Microsoft Defender for Office 365 uses advanced optical character recognition (OCR) and image-scanning algorithms to extract and evaluate URLs from images, including QR codes. However, heavily obfuscated images might occasionally evade detection.

How can employees protect themselves from QR code emails?

Employees should be trained to remain skeptical of unsolicited emails, even if they appear to come from known brands. They should never scan unknown QR codes from their computer screens using their personal mobile devices and should immediately report suspicious emails to their IT department.

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