After determining where the moisture is coming from (and it is probably stale or stagnate moisture causing the odor), I’d check to see where the odor itself is coming from – boxes stored in basement, or something that has died or spoiled down there. :-[
Then, use clorox or some other good disinfectant liberally – and ventelate the basement for a day or two. Sometimes a small fan in the basement window will help. We used this not long ago at a house we have been reclaiming, and it worked!