It sounds like RAM Scraping:
"The payment card processing systems in our stores transmit credit and debit card information needed to process card transactions initiated by our customers. This information is not stored by MAPCO and is only held in these systems for minutes. We believe the hackers were able to access this card data when the malware was active on the systems."
Recently discovered RAM Scrapers (aka memory-parsing malware):
MD5 2d48e927cdf97413523e315ed00c90ab 70feec581cd97454a74a0d7c1d3183d1 f84599376e35dbe1b33945b64e1ec6ab ed783ccea631bde958ac64185ca6e6b6 27bfffa7d034a94b79d3e6ffdda50084 cfee737692e65e0b2a358748a39e3bee 85f94d85cfeff32fa18d55491e355d2b cfee737692e65e0b2a358748a39e3bee 3446cd1f4bee2890afc2e8b9e9eb76a2 0fff972080248406103f2093b6892134 |