QR Code Phishing (“Quishing”): The New Office Threat

QR codes are everywhere, from restaurant menus to car park payment systems. While convenient, this ubiquity has given rise to a specific type of cyber attack known as "Quishing" or QR code phishing. In a professional office environment, this method is particularly effective because it bypasses many traditional security filters that check for malicious links in text-based emails.

What Is Quishing and How Does the Attack Work?

Quishing is a social engineering attack where a criminal hides a malicious link inside a QR code. Because a QR code is an image, standard email security software often fails to "read" the link hidden within it. When an employee scans the code with their smartphone, they are taken to a fraudulent website designed to steal login credentials, financial information, or install malware on the mobile device.

The process usually starts with a sense of urgency. An employee might receive an email appearing to be from the IT department, HR, or a common service provider like Microsoft 365. The message claims there is a problem with their account or a mandatory document that requires a signature. Instead of a clickable button, the email provides a QR code, instructing the user to scan it to resolve the issue. By moving the interaction from a secure work computer to a personal or less-protected mobile phone, the attacker gains a significant advantage.

Why Is Quishing Becoming a Major Office Threat?

Attackers favour Quishing because it exploits a gap in human and technical defences. Modern email platforms are very good at identifying suspicious URLs in the body of an email, but they often struggle to scan images for the same threats. Furthermore, people tend to trust QR codes more than they trust links. Scanning a code feels like a physical action rather than a digital risk.

In a UK office setting, these attacks often mimic internal processes. You might see a QR code on a poster in a breakroom claiming to offer a staff discount, or an email about a new "Virtual Desktop" login procedure. Because the user is switching devices, they lose the protection of their computer's web browser, which might have otherwise flagged a site as dangerous.

How Can You Identify a QR Code Phishing Attempt?

Identifying a Quishing attempt requires a cautious approach to any request that asks you to move away from your primary workstation.

• Check the Source: If an email from a colleague or a department contains a QR code unexpectedly, verify it through a different channel, such as a quick chat message or a phone call.

• Inspect the URL: Most modern smartphones show a preview of the website address when you scan a code. If the URL looks scrambled, contains unusual characters, or does not exactly match the official company domain, do not click it.

• Consider the Context: Ask why a QR code is necessary. If you are already on your computer, there is rarely a legitimate reason for IT to ask you to use your phone to log into a work system.

How Can Businesses Protect Against Quishing?

Defending against this threat requires a combination of updated technology and staff awareness. Companies should ensure their email security tools are capable of image analysis and QR code "unwrapping." Additionally, implementing multi-factor authentication (MFA) is essential. Even if an employee is tricked into entering their password on a fake site, MFA provides a second layer of defence that can stop the attacker from gaining access.

Training is equally important. Staff should be taught that QR codes are just links in a different format and carry the same risks. Encouraging a culture where employees feel comfortable reporting suspicious images without fear of making a mistake is the most effective way to catch a Quishing campaign before it spreads through the organisation.