VBS/Vierika-A is a VBS worm consisting of two parts. The first, a VB script is likely to arrive as an attachment to an email, in a file called VIERIKA.JPG.VBS. If run, this script changes the Internet Explorer home page to a page from web.tiscalinet.it and alters the Internet Explorer security settings.
The second part of the worm is the HTML page at the address above. If the page is viewed after the worm has changed the IE security settings, a script will run which will create the file C:\VIERIKA.JPG.VBS. The worm will then attempt to email this file as an attachment to addresses from the Outlook address book, with the email subject line "Vierika is here" and the message body "Vierika.jpg".