How did hackers create the ‘Wanna Cry’ ransomware malware?

The WannaCry ransomware malware was created by exploiting a vulnerability in Microsoft Windows operating systems, particularly the SMB protocol. It leveraged an exploit known as EternalBlue, which was developed by the NSA and later leaked by a group called the Shadow Brokers. This ransomware was effective because it spread rapidly through networks by exploiting the vulnerability, encrypting files on infected systems, and demanding ransom payments in Bitcoin for decryption. The combination of effective spreading mechanisms and its widespread impact contributed to its notoriety.