This is a standard build optimized for Plague Star.

Maul and Bite for damage
Fetch and Primed Animal Instinct for utility
Reflect and Link Vitality for survivability (if your warframe health is low use Enhanced Vitality instead)
Hunter Recovery to restore health loss by Infested Boil toxin or a random Slash dots
Cat's Eye to increase the Critical Chance of weapons
Tek Enhance to increase Cat's Eye duration
Tenacious Bond to increase Critical Damage of weapons