Strange spam attack

[Domiav]

Hello guys;
we are experiencing a pretty strange kind of spam that involves revival of old discussions copying and paste part of a post.
No links, no adv text, no adv banners, no profile editing with urls into user fields or signature...nothing! just old th revival copying and paste a section of them-.-
Spam is made every time with a new user also if we don't ban the previous one, and every time it revive just a single discussion with a single post.
We have human verification on with logical phrases that require human presence without math quetsion like "the result of 2+2",we are asking color of logo and similar things with the answer that must be in italian(!).
Any help on this?
Thanks!

[ForceHSS]

<a href="http://ozzmodz.com/showthread.php/506-The-Era-Of-Big-Spam-Is-Over" target="_blank">http://ozzmodz.com/showthread.php/50...g-Spam-Is-Over</a>
Do what this posts asks

[Max Taxable]

This is "edit spam." They plan on coming back to edit the posts, putting the link spam in then.

You might want to be a beta tester for the upcoming product talked about at the link in my signature.