Carnival is a mass-mailer (worm) written in Visual Basic Script.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
Carnival.A arrives in a message that looks as follow:
Subject: Next Week: Brazilian Carnival Body: That's Great... Attachment: Brazilian_Carnival.JPG.vbs
The worm activates when a user click on the attached file. It spreads to all recipients written in Outlook address book.
On the top of its code this virus contains the following text:
followed by many commended lines.
Date Created: -
Date Last Modified: -