I can't really tell from your picture. Unripe strawberries do have little hairs
but strawberries can also get grey mold
or powdery mildew
the mold or mildew can be on any part of the plant, leaves, stems, fruit, etc.
Both are fungal diseases that are fostered in situations of a lot of moisture/humidity, especially if combined with low air circulation. It helps to only water the soil, not the plant. Organic fungicides include diluted milk, hydrogen peroxide, baking soda solution, but they work much better preventatively than as treatment, especially if the disease is advanced. You might need to start by pulling all the diseased ones and then treating the soil and remaining plants.