Marcus Hutchins, 23, gained celebrity status within the hacker community in May when he was credited with neutralizing the global "WannaCry" ransomware attack.
His attorney, Adrian Lobo, told reporters Hutchins would not be released on Friday because the clerk's office for the court closed 30 minutes after his hearing concluded, leaving his defence team not enough time to post the bail.
Lobo told a local NBC affiliate that Hutchins would be released on Monday and that she expected him to be on a flight on Tuesday to Wisconsin, where a six-count indictment against him was filed in U.S. District Court. He was receiving support from a "variety of sources" around the world to post his bail, she said.
Judge Nancy Koppe dismissed a federal prosecutor's claim that Hutchins was a flight risk, though she did order him to surrender his passport. If released, Hutchins would be barred from computer use or internet access.
Hutchins, also known online as MalwareTech, was indicted along with an unnamed co-defendant on July 12. The case remained under seal until Thursday, a day after his arrest in Las Vegas, where he and tens of thousands of others flocked for the annual Black Hat and Def Con security conventions.
He achieved overnight fame in May when he was credited with detecting a "kill switch" that effectively disabled the WannaCry worm, which infected hundreds of thousands of computers in May and caused disruptions at car factories, hospitals, shops and schools in more than 150 countries.
Hutchins was "doing well, considering what's gone on," Lobo, told reporters. She said Hutchins never expected to be in his current situation and that she did not know the identity of his co-defendant.
News of Hutchins' arrest on Wednesday shocked other researchers, many of whom rallied to his defence and said they did not believe he had ever engaged in cyber crime.
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