"We use a top-tier Web Application Firewall (WAF) to protect our website, but we were just notified that our payment checkout has been siphoned for weeks. Our developers checked the server logs and found absolutely zero suspicious traffic or files. How did the hackers bypass our firewall?"
Your firewall is blind to what happens inside your customers' web browsers. Hackers don't need to break into your server if they can hijack your Google Tag Manager (GTM) account. By injecting a stealth skimmer through GTM, the malicious code runs inside the browser, completely bypassing your server-side firewall.
WAFs only inspect incoming and outgoing network traffic hitting the hosting server. GTM executes script injections dynamically from Google's trusted CDN directly in the browser's Document Object Model (DOM). Because this code does not modify any files on the host origin server, traditional edge WAFs and file-integrity monitors are completely bypassed.
We implement Dynamic, Client-Side Behavioral Monitoring. Our browser-level defenses analyze the active execution behavior of scripts inside the user's browser context at runtime. If a GTM-injected script attempts to perform unauthorized DOM reads (such as capturing keystrokes in fields containing cc-number or cvv), our system instantly blocks the action and triggers an alert in under 60 seconds, regardless of how heavily the code is obfuscated.
Traditional server-side WAFs cannot see DOM-level behavior. VALZOX deploys active client-side behavioral monitoring to intercept unauthorized keystroke captures from within the browser runtime.
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