D&D General Werewolf Statblocks

[Moran]

I'm doing a homebrew campaign where my players will need to face two separate werewolves. One is an NPC who's contracted lycanthropy after trying to kill another werewolf outside of town. I've already done all the planning, but the werewolf statblock seems pretty underwhelming for main focus monsters. How do I make a good monster statblock from scratch that'll challenge my four, level five players?