Newest Trojan: Disguised to Do Damage: "Known variously as Xombe and Downloader, the program is attached to an e-mail that purports to come from Microsoft Corp. and supposedly delivers security updates to the user's computer. Experts haven't yet analyzed all of the Trojan's capabilities, but once activated, it downloads another executable file from a remote Web site. This file also appears to be a Trojan, which downloads and installs a third program. The third file can vary in name, but immediately begins requesting pages repeatedly from a Web site with a Russian domain, possibly as a denial-of-service attack. "