Officials said the agency recently dispatched the Letters Rogatory (LRs) issued from a local court here, as its probe found that alleged illegal remittances were sent to these two locations.
The agency, they said, is hopeful of getting vital leads in the case after receiving a reply from their counterparts.
A total of seven people have been arrested in this case by the ED, even as the CBI and the Income Tax department are also investigating it.
Some of those arrested in the case were said to be alleged middlemen for at least 15 fake companies, out of the total 59 which were involved in perpetrating the economic crime unearthed in October, 2015.
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It had said some traders allegedly connived with each other in "forming" fake companies and business entities in Hong Kong by "over valuing" the export value and subsequently claiming duty drawbacks.
ED is now investigating the activities of another suspected 44 fake firms which pumped money to overseas locations in a similar manner.