FireEye has found the WannaCry malware shares unique code with WHITEOUT malware that we have previously attributed to suspected North Korean actors. While we have not verified other experts’ observation of known DPRK tools being used to drop early versions of WannaCry, we have not observed other groups use the code present in both WannaCry and WHITEOUT and we do not believe it is available in open source. This indicates a connection between the two.
Our analysis has found this unique code shared across additional North Korean malware, including NESTEGG and MACTRUCK. Significantly, while this code is present in the MACTRUCK malware, it is not used. The shared code likely means that, at a minimum, WannaCry operators share software development resources with North Korean espionage operators.
— Ben Read, Analyst, FireEye
