WannaCry is the ransomware computer worm that targets computers running Microsoft Windows. Initially, the worm uses the Eternal Blue exploit to enter a computer, taking advantage of a vulnerability in Microsoft’s implementation of the Server Message Block(SMB) protocol. It installs Double Pulsar, a backdoor implant tool, which then transfers and runs the WannaCry ransomware package. Several organizations have released detailed technical write ups of the malware,including Microsoft, Cisco, Malware bytes, and McAfee. The “payload” works in the same fashion as most modern ransomware: it finds and encrypts a range of data files, then displays a “ransom note” informing the user and demanding a payment inbitcoin. It is considered a network worm because it also includes a “transport” mechanism to automatically spread itself. This transport code scans for vulnerable systems, then uses the Eternal Blue exploit to gain access, and the Double Pulsar tool to install and execute a copy of itself.