Krebs cited a case that has happened a few weeks ago in the Oklahoma City metropolitan area where at least four banks were victims of ATM attacks involving insert skimmers.
The KFOR news channel quoted a local police detective saying “the skimmer contains an antenna which transmits your card information to a tiny camera hidden somewhere outside the ATM.”
Krebs confirmed that financial industry sources tell him that preliminary analysis of the insert skimmers used in the ATM attacks confirms they were equipped with technology to transmit stolen card data wirelessly to the hidden camera using infrared.
The insert skimmers used to compromise cash machines in Oklahoma City were equipped with the hidden that was used to record time-stamped videos of ATM users entering their PINs and to receive card data recorded and transmitted by the insert skimmer.
This design helps crooks in reducing maintenance activities for the skimmers, for example when they need to substitute the internal battery, they could leave the device in the ATM slot and swap out the hidden camera.