![open door hack phishing backdoor daxin](https://preprod.cyberscoop.com/wp-content/uploads/sites/3/2017/04/GettyImages-514927720.jpg?w=244)
Super-stealthy attackers used NSA exploit weeks before WannaCry
A more sophisticated, stealthier attacker used the same NSA-engineered cyberweapon to infiltrate the IT networks of companies across the world, including at least one publicly traded in…