Malaysian and US investigators say at least $US4.5 billion was stolen from 1MDB between 2009 and 2014, in a wide-ranging scandal that has implicated high-level officials, banks and financial institutions around the world.

The United States has been returning funds it has recovered from seized assets that were allegedly bought with stolen 1MDB money.

Malaysia has so far received $US3.89 billion of seized and repatriated 1MDB funds, the finance ministry said in a statement.

It plans to use the recovered funds to repay liabilities of 1MDB and its former unit SRC.

The funds - held in a special trust account - are sufficient to service 1MDB's debt obligations for 2021 and 2022, the ministry said.

The account does not currently include the $US700 million settlement reached with Malaysian banking group Ambank and $US60 million settlement with audit firm Deloitte earlier this year.

Negotiations are also currently ongoing with auditor KPMG, the finance ministry said without disclosing more details.

Over the last three years, Malaysia has been trying to recover 1MDB funds from global banks, financial institutions, individuals and other entities it says have caused losses from 1MDB.

This week, 1MDB filed 22 lawsuits in a court in Malaysia to recover assets worth in excess of $US23 billion.

Those being sued include units of Deutsche Bank, J.P. Morgan and Coutts & Co.

Goldman Sachs, which helped raise billions for 1MDB, last year paid $US2.5 billion to settle a Malaysian probe into the investment bank's role in the 1MDB scandal. It has also promised to help Malaysia recover assets worth $US1.4 billion.

Australian Associated Press