From the 12-18-18 Order that is public…
"…the Corporation moved to quash claiming (1) that it is immune under the Foreign Sovereign Immunities Act (“the Act”) …"
"…the Act’s only provision related to subject-matter jurisdiction, 28 U.S.C. § 1330(a),
grants
subject-matter jurisdiction over certain “nonjury civil action[s].” The provision includes nothing at all about criminal jurisdiction…."
So it is a criminal case and not civil.
https://www.scribd.com/document/395974126/12-18-18-DC-Circuit-Grand-Jury-Subpoena