PITTSBURGH — Federal prosecutors in Western Pennsylvania say a Bulgarian man has been arrested in an alleged scheme involving sophisticated malware designed to steal banking credentials and other confidential information from infected computers.

The U.S. Attorney’s Office alleges that 44-year-old Krasimir Nikolov of Varna, Bulgaria, gained access to victims’ online bank accounts and transferred funds or tried to do so.

The Oct. 4 indictment was unsealed Monday.