Federal agents took him into custody and he appeared in the Las Vegas court on Thursday but the hearing was adjourned to be continued today.
An indictment was issued by a grand jury impanelled by the US Attorney in the Eastern District of Wisconsin, Gregory Haanstad.
A grand jury indictment charged Hutchins him with creating and distributing malware known as the Kronos banking Trojan.
The indictment was filed in Wisconsin federal court last month.
His work to end the Wanna Cry 'ransomware' crisis embarrassed America's own security services because they created it first but lost control and it was used by criminals to extort cash, friends say.