Symantec Security Response Team provides valuable insight to Wannacry, where “similarities in code and infrastructure indicate close connection to group that was linked to Sony Pictures and Bangladesh Bank attacks.” 

Tools and infrastructure used in the WannaCry ransomware attacks have strong links to Lazarus, the group that was responsible for the destructive attacks on Sony Pictures and the theft of US$81 million from the Bangladesh Central Bank. Despite the links to Lazarus, the WannaCry attacks do not bear the hallmarks of a nation-state campaign but are more typical of a cybercrime campaign. Our analysis only allows us to attribute these attacks to the Lazarus group. The technical details do not enable us to attribute the motivations of the attacks to a specific nation state or individuals.