The National Cyber Security Centre (NCSC) has linked North Korea to the WannaCry malware that paralysed parts of the NHS last month. The investigation corroborates the findings of America’s National Security Agency (NSA), which traced the malware back to the Lazarus Group. NCSC, a new division of GCHQ, has not established whether the WannaCry attack was sanctioned by government officials. But the Washington Post has reported that the NSA was moderately confident that North Korea’s spy agency was responsible.