California was the most represented state with 4 million files found in the database of its residents.
California was the most represented state with 4 million files found in the database of its residents.

A Dun & Bradstreet 52GB database containing about 33.6 million records with very specific details about each of the people involved from job title to email address has been exposed.

The database was sent to independent cyber researcher Troy Hunt who found the records contained not only dozens of specific details on each person, but  is organized in a way indicating the content was not pulled haphazardly from a corporation during a hack, but was instead properly curated and ready for distribution to a customer.

ZD Net was able to confirm that the content belonged to NetProspex, a company Dun & Bradstreet purchased in 2015 and is used by marketers looking to sell directly to specific types of people.

Although Dun & Bradstreet is investigating the incident, it is not known at this time how it was exfiltrated, ZD Net reported.

Dun & Bradstreet told SC Media in a statement that, "Based on our analysis, it is our determination that there has been no exposure of sensitive personal information from, and no infiltration of our system. The information in question is data typically found on a business card. As general practice, Dun & Bradstreet uses an agile security process and evaluates and evolves security controls to protect the integrity of our data."

Hunt said the files are from a wide spectrum of government and private entities. The Department of Defense is most heavily represented with 101,013 files includes, followed by the U.S. Postal Service, ATT&T and Wal-Mart. The data points are very specific about each individual. Stating the person is a “soldier” with the position “ammunition specialist”, Hunt said.

“We've been bombarded by news of state sponsored hacking recently and frankly, if I was a foreign power with a deep interest in infiltrating US military operations, I'd be very interested in a nicely curated list pointing me directly to hundreds of intelligence analysts,” Hunt wrote.

Taking another view on the data loss was Brian Vecci, tech evangelist at Varonis, who noted that with all of the other breaches that have taken place over the last several years it's likely this data is already public.

“Thirty-three million records of government and large corporate employees have been compromised; honestly, is there anything in these leaks that isn't already out there about most of these individuals,” he said.

With that said, Hunt believes the data included here is so narrow that it would allow a malicious actor to know exactly who to target for spearphishing.

“For example, there's everyone in the C-suite, but that's a pretty openly accessible set of data anyway. So go down a rung and you've got 45 Vice Presidents; Senior Vice Presidents, Assistant Vice Presidents, Executive Vice Presidents, all with names and email addresses alongside job titles. The value for very targeted spear phishing is enormous because you can carefully craft messages that refer to specific individuals of influence and their roles within the organization,” he wrote.