31 CFR §515.579

1. (a)Depository institutions, as defined in § 515.333, are authorized to process funds transfers for the operating expenses or other official business in Cuba of third-country official missions or any intergovernmental organization in which the United States is a member or holds observer status.
2. (b)Depository institutions, as defined in § 515.333, are authorized to process funds transfers and maintain accounts for the personal expenditures of the employees, grantees, and contractors, or persons who share a common dwelling as a family member of such employees, grantees, and contractors, of third-country official missions or any intergovernmental organization in which the United States is a member or holds observer status in Cuba.