Xhook: Crossfire

The XHook Crossfire technique is not about espionage; it is about money. It fuels a multi-billion dollar underground economy called Cookie Stuffing and Affiliate Fraud.

For security vendors and incident responders, the subtlety of XHook Crossfire makes detection difficult. Traditional signature-based antivirus will miss it because no malicious binary is present—only hooked system calls. xhook crossfire

Once the script executes, it overwrites the native XMLHttpRequest.prototype.open or window.fetch methods. The malicious code wraps itself around the legitimate function. Now, every time the browser tries to talk to a server, the hook gets the first look. The XHook Crossfire technique is not about espionage;