A new sophisticated point-of-sale or memory-scraping malware called "Multigrain" was discovered on April 17, 2016 by the FireEye Inc. security company.
[3][4] Multigrain uses the Luhn algorithm to validate the credit and debit card details.
[5] This POS malware then infects the computer and blocks Hypertext Transfer Protocol (http) and file transfer protocol (ftp) traffic which monitors the data exfiltration.
[6][7] It exfiltrates the scraped information of credit and debit card via Domain Name Server (DNS).
[10][11] Multigrain targets specifically the Windows point of sale system, which has a multi.exe executable file.