Behzad Mesri is accused of accessing a computer without authorisation for the purposes of commercial advantage.
Court documents allege he had worked for Iran's military and been involved in a campaign to deface US websites
They allege he began conducting online reconnaissance of HBO's computer networks and employees in May 2017.
"Over the next couple of months, he successfully compromised multiple user accounts in order to obtain access to the media giant's servers," the documents say.
