Spyware:Spyware is a type of malware that is installed surreptitiously on personal computers to collect information about users, their computer or browsing habits without their informed consent.
Invitation Card.zip is a worm attached to a scam email that pretends to be an invite to social networking site Twitter.com.
If you open this Invitation Card.zip attachment, you??ll launch W32.Ackantta.B@mm, a worm that will copy itself to your removable drives and shared folders, then spam your other friends. W32.Ackantta.B@mm then may download a Trojan onto your machine, such as Trojan Vundo.
Technical details (How to remove Invitation Card.zip(pop up))