An Ilfracombe cyber security expert accused of creating and selling malware that steals banking passwords is due to appear at a US court later today (Monday).Marcus Hutchins, previously hailed a hero for derailing a global computer attack that wreaked havoc in the NHS, is expected to enter pleas at the hearing in Milwaukee. He was arrested earlier this month as he prepared to fly from Las Vegas where a friend said he had been attending the Def Con hacking convention. The 23-year-old faces six counts, dated between July 2014 and July 2015, of creating and selling a malware known as Kronos. Following a previous hearing, during which a prosecutor said Hutchins had admitted in a police interview he created a code that harvests bank details and indicated that he sold it, the Britons lawyer said his client would deny all the allegations. Hutchins, of Ilfracombe, was widely celebrated for finding a kill-switch that curbed the WannaCry ransomware that infected more than 300,000 computers in 150 countries and crippled the NHS in May.