News of a botnet run by an identity theft service reaching into computers and searching for information at some of the country's largest consumer and business companies that aggregate data should come as a warning to data companies supporting advertising services. Naked Security points to a seven-month investigation led by Brian Krebs into the service that sells the Social Security numbers, birth records, credit and background reports of millions of U.S. residents. He identifies some of the companies hit by the botnet: LexisNexis, Dun & Bradstreet, and Kroll Background America.