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DNSChanger Exploit Targets Routers Through Web Browsers

Proofpoint recently discovered a variant of the DNSChanger exploit kit (EK), which is commonly used in malvertising campaigns. The latest version infects physical internet routers through web browsers. But instead of poking holes in a victim’s browser or computer, DNSChanger exploits vulnerabilities in the router itself.

The method of the attack is fairly sophisticated in execution. It starts when a cybercriminal buys legitimate ad space on a website and posts a file that has been poisoned with JavaScript. At first, the JavaScript simply makes a Web Real-Time Communication (WebRTC) request directed at a Mozilla STUN server that will be able to deliver the victim’s local IP address.