new type of spam: white text links on white background hidden in posts

[rrr]

Is anybody else seeing this type of spam on their boards?

The post looks like this:
Attachment 103896

But when you look at the edit view of the post, it looks like this:
Attachment 103897

They are using the color bbcode to change the color of their text and links to white so they aren't viewable in the regular post.

Is there any way to stop this? Can I remove "white" from the color options?

I also have the Prevent Spam posts installed, could I add BBcode to that to block?

Any other creative solutions?