WannaCry attack is infecting systems in dozens of countries leveraging NSA exploit codes leaked by the hacker group Shadow Brokers. Spains CERT put out an alert saying that the outbreak had affected several organizations. The Spanish CERT issued an alert warning the organizations and confirming that the malware is rapidly spreading. The attack is caused by exploiting the vulnerability described in bulletin MS17-010 using EternalBlue / DoublePulsar, which can infect other connected Windows systems on the same network that are not properly updated. Infection of a single computer can end up compromising the entire corporate network.”]
Source: https://securityaffairs.co/wordpress/59057/cyber-crime/massive-attack-wannacry-ransomware.html