The British cyber security expert accused of creating and selling malware that steals banking passwords has been released from a US prison, the jail has said. Marcus Hutchins, the 23-year-old previously hailed a hero for derailing a global computer attack that wreaked havoc in the NHS, was held in Nevada Southern Detention Centre over the weekend. Prison spokeswoman Kayla Gieni said he was no longer at our facility yesterday (Monday) but was unable to say whether he had been released on bail as a judge had ordered on Friday. Hutchins, of Ilfracombe, is due to appear in court in Milwaukee today (Tuesday), charged with six counts of creating and selling a malware known as Kronos. His lawyer, Adrian Lobo, said they would fight the case and Hutchins would enter not guilty pleas to all the counts, which date between July 2014 and July 2015. A prosecutor has said that Hutchins admitted to investigators after his arrest in Las Vegas last week that he wrote the code and hinted he sold it. Strict bail conditions were set for Hutchins, who works for Los Angeles computer security firm Kryptos Logic, that include him having no access to the internet, surrendering his passport and being monitored by GPS. Family, friends and cyber security colleagues had been trying to raise enough money to meet the 30,000-dollar (£23,000) bond to allow his release. Hutchins was previously praised for for finding a kill-switch that curbed the WannaCry ransomware that infected more than 300,000 computers in 150 countries in May. The malicious software demanded a ransom from users so they could regain control of their machines.