The bank also said it would take steps to curb its remaining transactions in dollars, which it still receives particularly for oil sales.
In response to fresh US sanctions announced since last month, "Iran has sought to limit its dependence on the dollar... This policy will continue," the bank said in a statement published by state media.
A Luxembourg court last week denied Tehran's request to retrieve the ISD 1.6 billion frozen in the country during an earlier raft of sanctions targeting Iran's nuclear programme.
Iran rejects the accusation and demands the return of the money, which is frozen in the Clearstream clearing house, a financial company based in Luxembourg.
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A separate case is being heard in Luxembourg to decide whether the money will be released to the US.
Billions of dollars in Iranian assets were frozen in the US and Europe as part of efforts to push Tehran into a nuclear deal with world powers, which was finally signed in July 2015.
The US Supreme Court ruled last year that USD 2.1 billion frozen in a Citibank account in New York should be given to the US victims of the 1983 bombing -- a verdict Iran is contesting at the International Court of Justice.