Last March, LexisNexis revealed that intruders gained access to a database belonging to one of its subsidiaries and obtained the personal data of as many as 310,000 people through numerous name searches. The breach occurred at Seisint, a Florida-based company that LexisNexis bought last year, which maintains databases for law enforcement, legal professionals and others through a service called Accurint.

According to the hackers, none of them knew about LexisNexis or Seisint until they stumbled upon a Florida police officer's Seisint account.

A friend of Krazed masqueraded as a 14-year-old girl online and engaged a Florida police officer in a chat session, the hackers said. The friend sent the officer an attachment, which he said was a slideshow containing naked pictures of the girl he was pretending to be. When the officer clicked on it, a Trojan horse downloaded silently to his computer, which gave Krazed complete access to the computer's files.