Security firm NetWitness reports that more than 74,000 PCs worldwide were infected by a botnet over the past year and a half.

"The systems were infected with the ZeuS Trojan and the botnet was dubbed 'Kneber' after a username that linked the infected PCs on corporate and government systems," writes CNET News' Elinor Mills.

"NetWitness said it discovered more than 75 gigabytes worth of stolen data during routine analytic tasks as part of an evaluation of a client network on January 26," Mills writes. "The cache of stolen data included 68,000 corporate login credentials, access to e-mail systems, online banking sites, Facebook, Yahoo, Hotmail, 2,000 SSL (Secure Sockets Layer) certificate files and data on individuals."

Click here to read the CNET News story.