Extension:Bad Behavior

Bad Behavior is a set of PHP scripts which automatically blocks harvesters, spam bots, and other funky stuff. Bad Behavior version 2 was released on July 4, 2006 with better support for blocking malicious edits on MediaWiki. It installs much as any other extension.

Bad Behavior is designed to integrate into your PHP-based Web site, running as early as possible to throw out spam bots before they have the opportunity to vandalize your site with their junk, or even to scrape your pages for e-mail addresses and forms to fill out.

Not only does Bad Behavior block actual vandalism to your site, it also blocks many e-mail address harvesters, resulting in less e-mail spam, and many automated Web site cracking tools, helping to improve your Web site’s security.

Bad Behavior is a MediaWiki extension. It is supported on MediaWiki 1.17 or later versions.
 * Bad Behavior on MediaWiki