Security used to be a straightforward matter. Email was the primary attack vector and simply installing an anti-virus product and exercising caution when opening attachments mitigated the majority of threats. When a system did become infected, the consequences were not usually particularly dire; inconvenience and data loss were the most likely consequences. But times have changed. The Web has become the attack vector of choice and todays threats are rapidly evolving, stealthy and almost always motivated by profit.