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What this is, is an advance fee fraud. The only thing you're going to be doing is to give your bank account details to scammers, and the only thing you're going to get back in return is robbed.
There is no such bank in Malaysia as Halk Credit Union Bank. The Malaysian Government provides a list of all of the banks in Malaysia and this one is not on it.
The site is a dummy website -- set up to look like a bank by the scammer -- but it's simply to fool you into thinking its legitimate. The site's WHOIS shows that it was created on September 24, 2015 -- so it's less than 4 months old. It will expire in 8 more months and vanish into cyberspace along with any hope of you finding these people. The site's IP address traces to the US and not to Malaysia and the site owner is using a private proxy service to hide his identity and real location. You can see this for yourself by going to www.domaintools.com and running the "bank's" WHOIS information.
The US Treasury has nothing to do with the distribution of inheritances.
I assume Helena Acquah is a romance scammer, since her name is ***** ***** the web with other romance scams. in any case, even if she's not, cease all contact with her and anyone else related to this so-called inheritance. Don't send any of these folks any money and keep your bank details to yourself.
If you have given out your bank details contact your bank, ASAP, close your account and open a new one. Take precautions against Identity Theft and report this fraud to the FBI at IC3.gov, their online Internet Crime Complaint Center.