If I rmb correctly, income derived from overseas is not taxable under Malaysia law unless you conduct business in Malaysia.

However, as we have no CGT here, you likely won't have any tax to pay if your gains are in capital gains.

Dividends might be a separate issue, but unless your dividends is from REITs, they should be tax exempt as well. The only tax you need to pay is the 30% withholding tax imposed by the US