Indonesian authorities have revealed they have linked an Australian man to $500,000 they suspect has been used to support terrorism and send Indonesian nationals to Syria to fight with Islamic State.

The Australian man is married to an Indonesian woman who the ABC understands is from Java but is now living in Australia.

Key points: Indonesia links Australian man to $500,000 allegedly used to send fighters to Syria

Indonesia links Australian man to $500,000 allegedly used to send fighters to Syria Man used Indonesian wife to open bank accounts, channel money

Man used Indonesian wife to open bank accounts, channel money Officials believe terrorist sympathisers marrying Indonesian women to further cause

Officials believe terrorist sympathisers marrying Indonesian women to further cause Hundreds of Indonesians believed to be fighting with IS

In an exclusive interview with the ABC, Agus Santoso, the deputy chair of Indonesia's financial intelligence body Intrac, said they had tracked 5 billion rupiah from bank accounts in Australia that has been transferred to at least 10 accounts in Indonesia.

"That man collected money from many people in Australia. Then he sent it to his wife's account in Indonesia," Mr Santoso said.

"So this Indonesian woman was used to open some bank accounts which we suspect have links with terrorism suspects.

"What is surprising is that the kingpin is not an immigrant. In my opinion he is native Australian, not an immigrant. I mean, he is white."

Intrac, also known as the Financial Transactions and Analysis Centre (PPATK), has tracked the money since 2012 and said some of the funds were still active in Indonesian accounts.

Mr Santoso said he strongly suspected the money was being used to send Indonesians to Syria, while also funding IS recruitment to strengthen the terrorist network in Indonesia.

He said $500,000 goes a long way in Indonesia.

"It only costs $250 to make a bomb," he said.

"And of course they also want to have pool funding, reserve funding, so they can do more activities."

Intrac said the Australian kingpin collected money through fundraising in Australia.

"Then he sent the money to several accounts in Indonesia, mostly the accounts opened by his wife," Mr Santoso said.

"There are also some accounts opened by other members of his group. Because there's his wife and there is also his network."

Loophole for terrorists to expand their network

Mr Santoso would not elaborate on the identity of the Australian or his Indonesian wife and refused to publicly reveal their whereabouts in Australia.

Australia's financial intelligence unit, Austrac, confirmed it was working closely with its Indonesian counterpart and the Australian Federal Police on entities linked to terrorist organisations.

But in a statement it said it was unable to comment on individual intelligence or operation matters.

Mr Santoso said he believed there was a phenomenon whereby terrorist sympathisers were marrying Indonesian women to help further their cause.

"In this case we look at the modus operandi. It is a loophole for terrorists to expand their network by marrying Indonesian women and recruit their families or friends so they can influence them," he said.

"And there is the potential to use Indonesian women to open bank accounts in Indonesia. The phenomenon, small as it may seem, should be seriously considered."

Indonesians going to Syria to fight with Islamic State

Although the official figure is unclear, and estimates vary, hundreds of Indonesians are believed to have travelled to Syria to fight with Islamic State.

The ABC has been told about 80 had returned home and were being monitored by intelligence bodies and police.

In the latest Indonesian propaganda video which emerged online, young Indonesian men and teenagers are seen undertaking combative training and indoctrination.

"We will show to those stupid infidels that we are the group of people who love their death as much as they love their life," their commander tells them in the clip.

"We have the ambition to meet the death as martyrs today in the name of God. We will never run away."

It is unclear where the images were filmed, although it was thought to be somewhere near the Syrian-Turkish border.