Cyber criminals are targeting ATM machines through the banks networks, the operations involve squads of money mules for the cashout. Cyber criminals have realized that not only can ATMs be physically attacked, but it is also very possible for these machines to be accessed through the network. The Europol suggest the adoption of new measures to protect ATM networks to improve the security of their ATM networks. Crooks use to target banks employees with spear phishing messages using malware that once executed allows attackers to compromise targeted networks.”]
Source: http://securityaffairs.co/wordpress/63476/cyber-crime/atm-networks-hacking.html