FortiGuard Advisory (FGA-2006-08)

W32/Grew.A!wm is a mass-mailing worm that attempts to spread through network shares and lower security settings. Fortinet rates it as a level 4 threat. It accounted for approximately 15% of malware activity worldwide since its discovery.

When executed, this worm disables mouse and keyboard of an affected system, gathers emails from files on the system and then sends itself as an email to those addresses. Attachment varies between the executable and a MIME file containing the executable. In addition it spreads through shared folders across networked systems. The payload is compromising security of the system by deleting files related to Antivirus product installations and terminates security processes.

Some of the subjects used by the worm

	Part 1 of 6 Video clipe
	Miss Lebanon 2006
	My photos
	Fwd: image.jpg
	Fw: Sexy
	Fw: Real show
	Fwd: Crazy illegal Sex!

Some of the file attachments used by the worm:

	WinZip.BHX
	DSC-00465.pIf
	New_Document_file.pif
	eBook.pdf
	eBook.PIF
	Video_part.mim
	Atta[001],zip .SCR
	Attachments001.BHX
	WinZip.zip .sCR

For further information on W32/Grew.A!wm, visit Fortinet's Virus Encyclopedia at: W32/Grew.A!wm

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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.