An interesting read.
Trojans - and how to protect your network against them. Full artical here.
This white paper outlines what Trojans are and why they pose a danger to corporate networks. As early as 2001, an eWeek article reported that tens of thousands of machines are infected with Trojans. This is still the case today - and the use of more sophisticated technology makes them all the more alarming: Trojans can be used to steal credit card information, passwords, and other sensitive information, or to launch an electronic attack against your organization. The white paper discusses the need for a Trojan and executable scanner at mail server level in addition to a virus scanner, to combat this threat.