Virus authors and Trojan writers are using fresh malware tricks to fool traditional content filtering packages, email security firm MessageLabs says. A feature of Microsoft Outlook can be exploited to evade content filters and persuade an email recipient that an attachment is safe to open – even when it contains malicious code. How the New Exploit Works. The exploit relies on especially crafted email headers, creating an attachment with three file-extensions. Standard email packages will not generate these headers; these emails must either be created by hand, or using hacker tools (many of which are freely available, MessageLabs warns). Full Story