Risk and financial advisory solutions provider Kroll on Friday disclosed that one of its employees fell victim to a "highly sophisticated" SIM swapping attack.
The incident, which took place on August 19, 2023, targeted the employee's T-Mobile account, the company said.
"Specifically, T-Mobile, without any authority from or contact with Kroll or its employee, transferred that employee's phone number to the threat actor's phone at their request," it said in an advisory.
This enabled the unidentified actor to gain access to certain files containing personal information of bankruptcy claimants in the matters of BlockFi, FTX, and Genesis.