Catalysis of the reactions: 5,6alpha-epoxy-5alpha-cholestan-3beta-ol + H2O = cholestane-3beta-5alpha,6beta-triol, and 5,6beta-epoxy-5beta-cholestan-3beta-ol + H2O = cholestane-3beta-5alpha,6beta-triol.
5,6alpha-epoxy-5alpha-cholestan-3beta-ol hydrolase activity