A security firm on Tuesday reported discovering a phishing scheme in which the scammers used Internet telephony to copy a bank’s automated voice system in order to steal customers’ passwords, account numbers and other personal information.

In the attack that occurred last week, con artists sent spam disguised as coming from a small bank in a large East Coast city, Cloudmark Inc., a messaging security firm, said. The message asked the recipient to dial a telephone number to talk with a bank representative.

Read more: Phishers Snare Victims With VoIP