I would not be surprised if they do trade with cryptocurrency considering that cryptocurrencies are really hard to trace compared to the conventional means of trading such as cash or valuable resources. Unless their funders dont really accept cryptocurrency and they stick with the older methods of payment.
terrorists usually use cryptocurrency or bitcoin payment systems to fund acts of terrorism.
But I think terrorists now prefer to use more conventional methods of interbank transfers, they tend to use cryptocurrency when they make small payments such as to redeem illegal goods.