31 C.F.R. § 578.802
Any action that the Secretary of the Treasury is authorized to take pursuant to E.O. 13694 of April 1, 2015, as amended by E.O. 13757 of December 28, 2016, and any further Executive orders relating to the national emergency declared therein, and any action that the Secretary of the Treasury is authorized to take pursuant to Presidential Memorandum of September 29, 2017: Delegation of Certain Functions and Authorities under the Countering America's Adversaries Through Sanctions Act of 2017, the Ukraine Freedom Support Act of 2014, and the Support for the Sovereignty, Integrity, Democracy, and Economic Stability of Ukraine Act of 2014, may be taken by the Director of OFAC or by any other person to whom the Secretary of the Treasury has delegated authority so to act.
31 C.F.R. §578.802