Files with .good file extension can be found as encrypted and renamed archives affected by the "Scatter" ransomware.
GOOD file extension - Scatter ransomware affected data
What is good file? How to open good files?
File type specification:
The good file extension is lately also used by several different ransomware, most notably "Scatter" which is infected via Trojan-Ransom.BAT.Scatter.
This particular ransomware encrypts and renames files with the appendix to extension being .crypt, *.good or *.pzdc.