spam bots

[dkawika]

they joined once in awhile and usually it was just one but now 100's have joined and i have to keep banning them, how do i stop this? on register i have the image code thing but is there anything else i can add to that that would stop them from registering?

[Gimmick]

I read on teh register they have cracked how to get passed the gmail and hotmail captcha systems, so we are all getting greif. I have had viagra and porn etc on mine, I have changed the option to all new members are moderated, so I can approve the correct ones until google and hotmail sort themselves out... grrrr

[Cloverfield]

Try chaging your verification image to a question.

[Mike Vollmer]

This is all it takes to stop the current attack (add a registration question):

http://www.vbulletin.com/forum/showthread.php?t=205214

More info on the current attack in this vbulletin.com thread:

http://www.vbulletin.com/forum/showthread.php?t=286535