If possible, use several different anti-virus programs. It is quite possible that one program won't locate a virus when the other will.
Another mass-mailed worm exploits a vulnerability in IE
August 5, 2003
Microsoft Corp. is warning its customers about a worm that exploits a vulnerability in its Internet Explorer browser.
The worm called “MiMail” arrives posing as an e-mail from the network administrator and gets users to activate the virus by promising details of an e-mail account expiry.
The e-mail that carries the worm has "your account" in the subject line and the body reads,
"Hello there, I would like to inform you about important information regarding your e-mail address. This e-mail address will be expiring. Please read attachment for details."
It is then signed "Best regards, Administrator" and contains an attachment labeled "message.zip" that carries the malicious worm.
When the attachment is opened, a built-in Java script enters via Exploit.SelfExecHTML and copies itself onto disk files. Microsoft discovered this flaw in March 2002 and has released a patch for Internet Explorer.
In order to spread “MiMail” harvests e-mail address on the infected system.
Most antivirus vendors post the worm at the top of their daily charts, however “”MiMail” was given just “medium threat” rating by most of the experts.
Users can avoid the worm by not opening the attached file, or by updating their anti-virus defenses. Another simple way to prevent infection is downloading and installing security patch from Microsoft.