Sima Bahous, executive director of UN Women, told ambassadors in the Security Council that some governments were making cuts.
UN officials are calling for more international engagement to combat sexual violence against women and girls in the Sudan conflict.
The groups also kidnapped around 240 people and took them to Gaza.
There are reportedly seven million Afghan refugees worldwide, with the majority of them in Pakistan and Iran.
The report said increasing influence over aid programmes is one facet of an intensive strategy to consolidate power.
