A week on from the WannaCry outbreak, a huge number of articles have been written on the topic. These have covered everything from in-depth analyses of WannaCry itself to discussion pieces about the EternalBlue and DoublePulsar exploits and, latterly, warnings about other pieces of malware using the same propagation techniques as WannaCry.
Article Link: https://blogs.forcepoint.com/security-labs/wannacry-multiple-malware-families-using-eternalblue-exploit