I would say that it is more of a worm than anything.

Strictly speaking, a trojan is an executable that appears to do one thing but does something else as well.

If you remember the "I love you" or "Lovebug" malware, you needed to open the attachment? "Anna Kournikova"................same thing. They both required user intervention but neither are called "trojans"

Let's face it, the whole AV industry is sloppy in its terminology, they cannot even agree a naming convention?

Just my £0.02