A step-by-step comparison of the current kernel and the one on which it is based (Goldeneye Petya) We hope to identify if this malware could have been recompiled from the original code, or its just a work of anyone with the appropriate skills to modify the ready-made binary. In this analysis, we can find that the layout of EternalPetya is identical to Goldeneye. In both cases, there are big portions of code that are identical in both.”]
Source: https://blog.malwarebytes.com/threat-analysis/2017/06/eternalpetya-yet-another-stolen-piece-package/