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Crooks threaten to leak 3B personal records 'stolen from background check firm'. Turns out opting out actually works?. Billions of records detailing people's personal information may soon be dumped online after being allegedly obtained from a Florida firm that handles background checks and other requests for folks' private info. A criminal gang that goes by the handle USDoD put the database up for sale for $3.5 million on an underworld forum in April, and rather incredibly claimed the trove included 2.9 billion records on all US, Canadian, and British citizens. It's believed one or more miscreants using the handle SXUL was responsible for the alleged exfiltration, who passed it onto USDoD, which is acting as a broker. The pilfered information is said to include individuals' full names, addresses, and address history going back at least three decades, social security numbers, and people's parents, siblings, and relatives, some of whom have been dead for nearly 20 years. According to USDoD, this info was not scraped from public sources, though there may be duplicate entries for people in the database. Fast forward to this month, and the infosec watchers at VX-Underground say they've not only been able to view the database and verify that at least some of its contents are real and accurate, but that USDoD plans to leak the trove. Judging by VX-Underground's assessment, the 277.1GB file contains nearly three billion records on people who've at least lived in the United States – so US citizens as well as, say, Canadians and Brits. This info was allegedly stolen or otherwise obtained from National Public Data, a small information broker based in Coral Springs that offers API lookups to other companies for things like background checks. The biz did not respond to The Register's inquiries. There is a small silver lining, according to the VX team: "The database DOES NOT contain information from individuals who use data opt-out services. Every person who used some sort of data opt-out service was not present." So, we guess this is a good lesson in opting out. USDoD is the same crew that previously peddled a 3GB-plus database from TransUnion containing financial information on 58,505 people. And last September, the same criminals touted personal information belonging to 3,200 Airbus vendors after the aerospace giant fell victim to an intrusion.