The Mariposa botnet, one of the largest in the world, has been taken down.

"The take down came as authorities in Spain arrested three of the ringleaders of the the botnet," writes The Register's Dan Goodin.

"The Mariposa botnet, which infected 12.7 million PCs, appeared in late 2008 and spread to more than 190 countries," Goodin writes.

Click here to read the article at The Register.