User blog comment:Ryunnz/Underpowered Werewolves/@comment-4306778-20111126042623

Actually, the idea is that this kind of werewolf isn't affected by the moon. There are werewolves that are forced to transform on a full moon, but the Companions all source their beast blood from a different kind. The werewolves that attack you on sight are those ones, but I think the Silver Hand has done something to them, to keep them in their beast form forever.

BTW, it's a curse that some Companions see as a superpower. I suppose it's more of a hex than a curse, but the Ring of Hircine is cursed, so you transform uncontrollably.