FortiGuard Advisory (FGA-2005-11)

Fortinet advises that its FortiGate security appliances, FortiMail antispam appliances and FortiClient Host Security software protect against the latest Mitglieder variants, including W32/Mitglieder.FY!tr, W32/Mitglieder.FZ!tr and W32/Mitglieder.GA!tr.

W32/Mitglieder.FZ!tr is a Downloader type Trojan that is manually sent by hackers and/or mail proxies established by other viruses and Trojans, which attempts to connect to various Web sites to retrieve a Web hosted binary. As of yet, there are no binaries available for W32/Mitglieder.FZ!tr to download. However, unless the Trojan is removed from the compromised system, it could eventually locate a binary from one of the Web sites and then download and execute a file with unknown results. For further information on W32/Mitglieder.FZ!tr, please visit Fortinet's Virus Encyclopedia at:

W32/Mitglieder.FY!tr is similar to W32/Mitglieder.FZ!tr, differing in that it is currently not as prevalent, and uses differing Web site lookups to download its binary. Its size is 13,312 bytes. For further information on W32/Mitglieder.FY!tr, please visit Fortinet's Virus Encyclopedia at:

W32/Mitglieder.GA!tr is similar to W32/Mitglieder.FZ!tr, differing in that it is currently not as prevalent, and uses differing Web site lookups to download its binary. Its size is 10,752 bytes. For further information on W32/Mitglieder.GA!tr, please visit Fortinet's Virus Encyclopedia at:

The latest Mitglieder Downloader type Trojans are affecting users in the US and European regions and Fortinet rates W32/Mitglieder.FZ!tr as "Level Four" and the other two at "Level Two" threats. To protect against W32/Mitglieder.FY!tr, W32/Mitglieder.FZ!tr and W32/Mitglieder.GA!tr, Fortinet advises administrators to enable scanning of attachments which may attempt to filter through SMTP, POP3 and IMAP services.

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About Fortinet ( www.fortinet.com ):

Fortinet is the pioneer and leading provider of ASIC-accelerated unified threat management, or UTM, security systems, which are used by enterprises and service providers to increase their security while reducing total operating costs. Fortinet solutions were built from the ground up to integrate multiple levels of security protection--including firewall, antivirus, intrusion prevention, VPN, spyware prevention and anti-spam -- designed to help customers protect against network and content level threats. Leveraging a custom ASIC and unified interface, Fortinet solutions offer advanced security functionality that scales from remote office to chassis-based solutions with integrated management and reporting. Fortinet solutions have won multiple awards around the world and are the only security products that are certified in six programs by ICSA Labs: (Firewall, Antivirus, IPSec, SSL, Network IPS, and Anti-Spyware). Fortinet is privately held and based in Sunnyvale, California.