Make sure your using the latest version of vbulletin
In the left column of the admin control panel - vbulletin options drop down - human verification options - either use image verification, question and answer or setup ReCaptcha.
If you are using the standard captcha phrase, the spam bots broke that a long time ago.
I think there is a modification where you can use 2 or 3 of the human verification options at the same time.
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