Warning! Wall Street scammers’ latest tactic

Balavan | E+ | Getty Images

Wall Street's industry-funded watchdog on Tuesday warned that scammers are turning to a rather old-fashioned strategy for defrauding investors—the phone call.

"In a new twist to Internet 'phishing schemes,' which use spam email to lure you into revealing everything from Social Security numbers to financial account information, it appears that some fraudsters may be resorting to a time-tested method—the telephone call," the Financial Industry Regulatory Authority (FINRA) said in a statement.

(Read more: Beware the 'change my address' scam)

In several recent cases, swindlers posed as employees of a major brokerage firm and called people, asking for their financial account details and Social Security numbers. Some of the impostors advertised high-yield certificates of deposit and then sent phony forms to collect additional information, FINRA said.

The industry also recently faced a spate of incidents in which impostors posing as customers called brokerages to give wire transfer instructions. Some brokerage employees wired client funds to the fraudsters, according to regulatory filings.

(Read more: Latest 'robocaller' scam targets seniors)

For consumers who get marketing calls from brokerages, FINRA recommends calling a compliance office or customer service center at the firm to confirm the call is legitimate.

The investor alert is called, "Cold Calls from Brokerage Firm Impostors—Beware of Old-Fashioned Phishing."

—By Reuters