From the article:
> AustralianSuper, the country's largest fund managing A$365 billion for 3.5 million members, said that up to 600 member passwords had been stolen to access accounts and attempt fraud.
> Four AustralianSuper members had a combined A$500,000 drained from their balances and transferred to other accounts that did not belong to them, according to the source, who was not authorised to speak publicly about the matter.
It's not completely clear if 600 passwords were "stolen" but only four accounts had any money transferred, or if there are more accounts at that fund that had money transferred.
And that's just one fund.
> Rest Super, the default industry pension fund for retail workers, with A$93 billion of assets under management, said it suffered an attack that impacted around 20,000 accounts, or around 1% of its 2 million members.
* Australia is part of the "West" here - ironic from a strictly geographic perspective
I am going off-topic here, because Australia is in question here, so perhaps replace my use of "US" with Australia and "American" with "Australian".
You can file an MLAT request
https://en.wikipedia.org/wiki/Mutual_legal_assistance_treaty
But it's a complex, time consuming process usually only done in cases of terrorism or espionage, not run of the mill fraud.
Pre self service on the internet call centers / mail in processors would have noticed if a large % of customers changed their payment details over a few days.