For years, cybersecurity teams focused their training on email phishing—teaching employees not to click suspicious links or download strange attachments. However, as organizations have tightened their email security, attackers have pivoted to a new, highly effective tactic: Quishing (QR Code Phishing).
Because QR codes obscure the destination URL and require the user to move from a protected desktop environment to a mobile device (which often lacks enterprise security software), they are incredibly dangerous. Attackers use malicious QR codes to bypass email filters, steal credentials, and distribute malware.
As an enterprise, protecting your employees and your customers from malicious QR codes requires a combination of robust technology and updated security protocols. Here is the enterprise guide to preventing quishing.
The Anatomy of a Quishing Attack
A quishing attack typically unfolds in one of two ways:
Digital Quishing (The Email Bypass): An attacker embeds a malicious QR code inside an image and sends it via email (e.g., an email claiming to be from HR, asking the employee to scan the code to update their benefits). Because traditional secure email gateways (SEGs) scan text for malicious links, they often fail to "read" the link hidden inside the QR code image, allowing the email to land in the employee's inbox. When the employee scans the code with their personal phone, they are taken to a fake login page designed to steal their Microsoft 365 or Okta credentials.
Physical Quishing (The Sticker Overlay): Attackers print malicious QR codes on stickers and physically place them over legitimate QR codes in the real world. This could be on a parking meter, a restaurant menu, or a promotional poster in a corporate lobby. The victim scans the code, thinking they are paying for parking, but their payment information is routed to the attacker.
Enterprise Strategies to Prevent Quishing
Combating quishing requires a defense-in-depth strategy that addresses both the generation of your own corporate QR codes and the security of your employees' devices.
Secure Your Own Corporate Links and QR Codes
If your marketing or HR teams are using free, unmanaged QR code generators, you are putting your brand and employees at risk.
Use an Enterprise Link Management Platform: Mandate that all corporate QR codes are generated through a centralized, enterprise-grade URL management platform like Klic.in.
Enforce Custom Domains: Never use generic short domains (like bit.ly) for corporate QR codes. Always use a recognizable branded short link (e.g., klic.in/yourcompany). This trains your employees and customers to expect a specific, recognizable URL when they scan your codes.
Automated Threat Scanning: Ensure your link management platform automatically scans the destination URLs of all generated QR codes against global threat intelligence feeds to prevent an employee from accidentally linking a corporate QR code to a compromised site.
Upgrade Email Security Infrastructure
Traditional email filters are no longer sufficient.
Implement Optical Character Recognition (OCR): Upgrade your email security stack to include advanced OCR capabilities. These systems can visually scan images embedded in emails, identify QR codes, extract the hidden URL, and run that URL through malware and phishing analysis before the email reaches the user's inbox.
Implement Mobile Threat Defense (MTD)
The core danger of quishing is that the attack usually happens on a mobile device, which is often outside the corporate network perimeter.
Deploy MTD Solutions: If employees access corporate data (email, Teams, Slack) on their mobile devices, those devices must have Mobile Threat Defense software installed (e.g., Lookout, Zimperium, or Microsoft Defender for Endpoint). MTD acts as a secure web gateway for the phone, intercepting the URL when a QR code is scanned and blocking access if the site is known to be malicious.
Modernize Security Awareness Training
Employees must be trained specifically on the dangers of QR codes, as the instinct is often to blindly scan and click.
Inspect Before You Click: Train employees that modern smartphone cameras will display a preview of the URL before opening the browser. They must be trained to read this preview URL. If the URL looks strange, is exceptionally long, or uses a suspicious domain, they should not proceed.
Never Log In via QR Code: Establish a strict corporate policy: HR, IT, or management will never ask an employee to scan a QR code to log into a corporate system or reset a password.
Physical Inspection: Train employees (especially facilities or marketing teams) to physically inspect corporate signage that utilizes QR codes to ensure a malicious sticker hasn't been placed over the original code.
Quishing exploits the inherent trust people have in QR codes. By securing your corporate link generation, upgrading your email filters to scan images, and educating your workforce, enterprises can close this critical vulnerability and protect their sensitive data.