The tech: Last year an innovation began circulating that lets crooks know when an ATM likely already has anti-skimming technology so they can move on without getting caught, per Krebs. It sells for $200.

• Some anti-skimming devices are “frequency-jammers,” which scramble the card data and confuse skimming devices.

How the hack works: Criminals drill a hole in the front of an ATM, which is later covered up with a faceplate to conceal the hole. They then attach card-reading devices with a magnet, and later attach a camera to obtain PINs as well.

What to watch: The Secret Service told Axios that the ATM skimming activity has been detected "throughout the east coast from Maryland to Massachusetts," but their current data does not yet point to a trend in location for the hacks.

Krebs advises: "If you visit an ATM that looks strange, tampered with, or out of place, try to find another machine. Use only ATMs in public, well-lit areas, and avoid those in secluded spots. Most importantly, cover the PIN pad with your hand when entering your PIN."

• "Finally, try to stick to cash machines that are physically installed inside of banks," Krebs wrote last year.

Editor's note: This has been updated with the latest details from the Secret Service.