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TransUnion reckons big dump of stolen customer data came from someone else. Prolific info-thief strikes again. Days after a miscreant boasted leaking a 3GB-plus database from TransUnion containing financial information on 58,505 people, the credit-checking agency has claimed the info was actually swiped from a third party. On Sunday, a thief using the handle USDoD shared via a cyber-crime forum what was claimed to be a TransUnion database containing sensitive information belonging to people in North and South America, Europe, and other parts of the world. This database is said to include people's names, internal TransUnion identifiers, passport information, ages, dates and places of birth, employers, summary of financial transactions, credit scores, and loan details, among other sensitive material. According to VX-Underground, which flagged up the dump on Twitter over the weekend, a copy of this database appeared to have been snatched on March 2 last year. TransUnion did admit in 2022 it suffered a security breach after criminals broke into a South American server and stole data relating to five million customers and 600,000 businesses. In a brief statement issued on Tuesday, the credit-rating giant addressed USDoD's claims. "TransUnion is aware of some limited online activity alleging that data obtained from multiple entities, including TransUnion, will be released," the biz said in its note Tuesday. In what has become boilerplate language in responding to security snafus, the credit-report biz said it "immediately" took steps to respond to the claims, including partnering with outside cybersecurity and forensic experts and launching an investigation. "At this time, we and our internal and external experts have found no indication that TransUnion systems have been breached or that data has been exfiltrated from our environment," the statement continued. And then it points the blame elsewhere. "Through our investigation, we have found that multiple aspects of the messages — including the data, formatting, and fields — do not match the data content or formats at TransUnion, indicating that any such data came from a third party." TransUnion did not respond to The Register's inquiries, including whether it knows who the third party may be, how USDoD snatched the data in the first place, and if this leak is related to the 2022 security failure. "Data protection is top priority at TransUnion. We take seriously any assertions regarding our information security and will continue to closely monitor this situation," the company's statement concluded. USDoD is the same fiend named in court documents [PDF] related to the arrest of Conor Brian Fitzpatrick, aka pompompurin, who ran BreachForums before the Feds shut down an incarnation of the message board earlier this year.  According to the court documents, USDoD in 2022 broke into the FBI's InfraGard, and then leaked contact details belonging to the almost 80,000 of the information-sharing network's members. More recently, USDoD reportedly raided Airbus and posted personal information belonging to the aerospace giant's 3,200 vendors on a cyber-crime forum. Tell your friends Some readers ask us if they can support The Register through some kind of subscription. The best way to back El Reg and keep our journalism flowing is to spread the word on social media, tell a colleague, sign up for a Register account and our newsletters, and comment away on articles. Find and share us on Bluesky, LinkedIn, and Twitter. Tip us off with news. And thank you for reading.