FortiGuard Advisory (FGA-2005-08)

Fortinet protects against W32/Bagle.CJ-mm (also known as W32/Mitglieder.FE). Latest Trojan Unexpectedly Disables Firewall, Antivirus and Other Security Applications Upon Opening Email Attachments

A new Trojan, W32/Bagle.CJ-mm is received via an email with .exe or .zip file attachments that contain a malicious executable file, which injects itself into Windows Explorer processes and stays resident in memory upon execution. As a Trojan, W32/Bagle.CJ-mm is spammed and does not spread by itself. Upon opening related attachments, the Trojan affects users by unexpectedly disabling firewall, antivirus and other security related applications, renaming files, deleting processes and generally lowering security settings. This latest Trojan is affecting users worldwide and Fortinet rates W32/Bagle.CJ-mm as a "Level Four" threat given that it is currently being spammed out in very large numbers. To protect against W32/Bagle.CJ-mm, Fortinet advises against opening simplistic email messages with .exe or .zip attachments, as well as attachments within emails from unknown senders. For instance, Fortinet advises against opening the attachment within the following example email:

Subject: new price
Body: price
Attachment: price.zip

For further information on W32/Bagle.CJ@mm, please visit Fortinet's virus encyclopedia at:
W32/Bagle.CJ@mm

For more information on Fortinet's FortiGuard Distribution Network please visit:
http://www.fortiguardcenter.com

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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.