Global cyber-attack: Security blogger halts ransomware 'by accident' - BBC News
The 22-year-old UK researcher tells how he stopped a global cyber-attack by spending £8. A UK security researcher has told the BBC how he "accidentally" halted the spread of the malicious ransomware that has affected hundreds of organisations, including the UK's NHS.
The 22-year-old man, known by the pseudonym MalwareTech, had taken a week off work, but decided to investigate the ransomware after hearing about the global cyber-attack.
He managed to bring the spread to a halt when he found what appeared to be a "kill switch" in the rogue software's code.