Defending Against “Quishing”: How Small Businesses Can Spot and Block QR Code Phishing Scams

Article summary: Quishing hides malicious links inside QR code images, letting them slip past the email filters and habits that catch typical phishing attempts. A few practical checks before scanning, paired with the right email security settings, close most of the gap.

A vendor invoice hits your inbox. Everything looks normal, except there’s no link to click. Instead, there’s a QR code with a simple instruction: scan it to confirm your payment details.

Would you think twice before pulling out your phone?

That instinct to scan without giving it much thought is exactly what makes quishing so effective. Short for QR code phishing, quishing hides malicious links inside QR codes, making suspicious destinations harder for both employees and traditional email filters to spot.

For small businesses, fighting back starts with layered email security that can account for QR-based threats, along with employees who know when to stop before they scan.

What Is Quishing and Why Is It Growing So Fast?

Quishing is phishing hidden behind a QR code. Instead of placing a malicious link directly in an email, attackers embed it in a QR code that sends anyone who scans it to a phishing site.

That simple change can make the scam harder to catch. QR codes can bypass text-based scanning tools because the malicious URL is contained in an image. They can also move the attack onto an employee’s phone, which may not have the same security protections as a company-managed computer.

And attackers are taking advantage. Microsoft Threat Intelligence detected 7.6 million QR code phishing attacks in January 2026. By March, that number had jumped to 18.7 million, a 146% increase in just two months.

For small businesses, that makes knowing what a suspicious QR code looks like increasingly important.

Where Quishing Shows Up in a Small Business

Quishing is not limited to suspicious emails. Attackers can put malicious QR codes almost anywhere an employee might expect to see a legitimate one.

Email attachments and invoices

A fake invoice, account alert, or IT notice may include a QR code instead of a clickable link. Scanning it can move the attack from the email inbox to a phone, where the employee may be less likely to recognize a fake login page or suspicious URL. The FBI has documented phishing campaigns using emailed QR codes to direct victims to credential-stealing websites.

Unsolicited packages

Quishing can even arrive through the mail. In 2025, the FBI warned about unsolicited packages containing QR codes designed to lure recipients to phishing sites or potentially download malicious software. The mystery of an unexpected package can be enough to tempt someone to scan.

Physical stickers in public spaces

Physical QR codes deserve some skepticism, too. The FTC warns that scammers have covered legitimate QR codes on parking meters with fraudulent ones that lead to fake payment sites.

Why This Slips Past Your Existing Defenses

Employees know to hover over suspicious links before clicking. QR codes remove that familiar checkpoint and can move the interaction to a phone, where phishing warning signs may be harder to spot.

They can also challenge traditional email defenses because the URL is hidden inside an image. Microsoft has responded by adding image processing and URL extraction to detect malicious links embedded in QR codes.

Better detection helps, but employee awareness still matters. An unexpected QR code deserves the same scrutiny as an unexpected link.

How to Spot and Block a Malicious QR Code

Stopping quishing takes a combination of smarter scanning habits and the right security tools.

Before scanning a QR code:

• Be suspicious of unexpected codes, especially messages that pressure you to act quickly.
• Check the URL preview before opening the page. Look for misspellings, strange domains, or anything that does not match the company you expect.
• Verify unexpected requests through a trusted website, phone number, or other known contact method instead of using the QR code provided.

The FTC recommends these same precautions, including checking the destination URL and avoiding unexpected QR codes sent by email or text.

On the technical side:

• Make sure your email security can extract and analyze URLs hidden inside QR codes. 
• Keep multi-factor authentication enabled, preferably using phishing-resistant methods where available. 
• Review your email security setup to make sure image-based threats are not creating a blind spot.

The simplest rule for employees is the same one that applies to suspicious links: if you were not expecting it, verify it before you open it.

Is Your Team Ready for the Next QR Code Scam?

Quishing takes advantage of a simple blind spot. Employees who have learned to think twice before clicking a suspicious link may not apply that same caution to a QR code.

Closing that gap requires both security tools that can detect image-based threats and employees who know what to look for.

Not sure whether your current defenses are ready for QR code phishing? Cloudavize can help you identify potential gaps and strengthen your protection. Call (469) 250-1667 or reach out through our contact page to get started.

Article FAQs

What is quishing?

Quishing is a type of phishing attack that hides a malicious link inside a QR code. Scanning the code may lead to a fake login page, credential theft, malware, or another malicious website.

Why do QR code scams bypass normal email security?

QR codes can make phishing links harder to detect because the URL is embedded inside an image rather than displayed as text. Modern email security tools may analyze QR codes, but systems without image and QR code scanning capabilities can miss the hidden link.

How can employees tell if a QR code is safe?

Check the URL preview before opening it and be cautious with unexpected QR codes or urgent requests. If you are unsure, verify the request using a trusted website, phone number, or other known contact method rather than scanning the code.