TOP 10 unattributed APT mysteriesTajMahal, DarkUniverse, PuzzleMaker, ProjectSauron (aka Strider), USB Thief, TENSHO (aka White Tur), PlexingEagle, SinSono, MagicScroll (aka AcidBox), Metador—all these targeted attacks are still unattributed.
Source:
TOP 10 unattributed APT mysteries