A waning moon isn't too popular in traditional astrology either.
Basically, a waxing moon indicates growth and upward mobility. So symbolically someone with a waxing moon has more opportunity in life and more chance to expand their resources, if all other things are equal. That's the basic idea.
A waning moon is more about dispersion and the spreading of knowledge/resources to others. So you could say that the waxing moon is more beneficial to the native, the waning more beneficial to those around him.
There are also other factors to consider on whether the moon is malefic or benefic, sign placement, aspects, relationship to dispositer, the sign the planet rules and house placement. Labelling the moon as a malefic or benefic based on one factor is never a good idea.