The British security expert hailed a hero for derailing a global cyber attack admitted to police he created a code which harvests bank details and hinted he sold it, a prosecutor told his US court hearing.

The British computer expert who helped shut down a world-wide cyber attack that crippled the NHS was due to appear in a US court charged with creating software that harvested banking details.

A young British computer expert credited with cracking the WannaCry cyber attack has said he does not consider himself a hero but fights malware because "it’s the right thing to do".

An international effort is under way to track down the criminals behind an unprecedented global cyber attack that wreaked havoc across the NHS in England.

The cyber specialist, known only as MalwareTech, registered a domain name that unexpectedly stopped the spread of the virus.