Computer World documents a small but highly sophisticated botnet below:
QUOTE: The botnet contained almost 1,500 compromised point-of-sale and other retail systems from 36 countries, researchers from IntelCrawler said. Security researchers uncovered a global cybercriminal operation that infected with malware almost 1,500 point-of-sale (POS) terminals, accounting systems and other retail back-office platforms from businesses in 36 countries. The infected systems were joined together in a botnet that researchers from cybercrime intelligence firm IntelCrawler dubbed Nemanja. The researchers believe the attackers behind the operation might be from Serbia. The size of the botnet and the worldwide distribution of infected systems brings into perspective the security problems faced by retailers from around the world, problems that were also highlighted by the recent PoS breaches at several large U.S. retailers.