FBI Warned Agents It Believes Phone Logs Hacked Last Year

An anonymous reader shares a report: FBI leaders have warned that they believe hackers who broke into AT&T's system last year stole months of their agents' call and text logs, setting off a race within the bureau to protect the identities of confidential informants, a document reviewed by Bloomberg News shows.

FBI officials told agents across the country that details about their use on the telecom carrier's network were believed to be among the billions of records stolen, according to the document and interviews with a current and a former law enforcement official. They asked not to be named to discuss sensitive information. Data from all FBI devices under the bureau's AT&T service for public safety agencies were presumed taken, the document shows.

The cache of hacked AT&T records didn't reveal the substance of communications but, according to the document, could link investigators to their secret sources. The data was believed to include agents' mobile phone numbers and the numbers with which they called and texted, the document shows. Records for calls and texts that weren't on the AT&T network, such as through encrypted messaging apps, weren't part of the stolen data.

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