The newest virus to be sent out is called Zoher.A . In the subject line is Welcome to Yahoo!Mail in the message line is Welcome to Yahoo!Mail then there is an attachment that reads Read me.txt_____PIF If someone opens this the worm executes a program which connects to a web site where it downloads a worm to propagate,which vary. The email message is in MIME format and in it is an embedded copy of the worm itself. The worm propagates by sending an email to all addresses listed in Windows Address Book via the default SMTP server. It uses a known vulnerability in Internet Explore- based email clients to execute the file attachment automatically. This vulnerability is also known as Automatic Execution of Embedded MIME. type. This worm is classed as low risk.