L'avviso del tuo antivirus riguarda una anomalia generica del MIME di un messaggio email o mht. Si verificano delle anomalie di questo tipo quando il messaggio è stato modificato per far partire in automatico l'allegato. Uno dei virus più recenti che usa questo sistema è il Klez.

Ho trovato questo:



HTML.MimeExploit
Alias: HTML/MimeExploit.IFRAME, HTML.MimeExploit.Klez
Category: HTML
Type: Other

CHARACTERISTICS
HTML.MimeExploit is a generic detection of web pages or e-mail messages which attempt to exploit the "Incorrect MIME Header" vulnerability in Internet Explorer.

This does not necessarily mean that a virus has been found. It merely means that HTML code was found which attempts to open an executable attachment without the user's express permission. This is usually done inside e-mail messages, and is used by Viruses such as Win32.Nimda, Win32.Aliz , Win32.Badtrans.29020 (aka Win32.Badtrans.B), and Win32.Klez.E, so that the virus is started as soon as the message is opened in Microsoft Outlook or Outlook Express.

For more information on this vulnerability, including a patch to fix it, please visit:

http://www.microsoft.com/technet/sec...n/MS01-020.asp

If this patch has already been applied, warnings of this virus may be safely ignored.