The most dangerous piece of software on your PC isn t a banking Trojan or a bot; it s your Web browser. The Web browser has become the main focal point of attackers attention and the frequency with which new vulnerabilities are found in popular browsers is making their work considerably easier than it should be. This is not a vendor-specific problem, as it applies to both Windows machines and Macs, and affects Internet Explorer, Firefox and Safari. Attackers are using sophisticated pieces of malware such as Gumblar, Nine Ball, Zeus and others to perform.
Source: https://threatpost.com/how-get-owned-one-easy-step-120809/73220/