imageless qr code in html

This rule detects the use of HTML tables to render QR codes without external image files. This technique, often referred to as 'imageless QR codes', involves creating a grid using HTML table cells (td) with CSS background colors (white and black) to form the QR pattern. Attackers use this method in phishing emails to embed QR codes that redirect victims to malicious websites, bypassing simple image-based security filters.