Check if your computer is patched against EternalBlue.
IMPORTANT: EternalBlue is used as a propagation mechanism. Patching the system does not mean that it is protected against the encryption routine. It only means that the system is protected against the "wormness" of recent WannaCry's variant.
Learn more:
- Countermeasures: https://www.us-cert.gov/ncas/alerts/TA17-132A#solution
- Microsoft Security Bulletin MS17-010 - Critical: https://technet.microsoft.com/en-us/library/security/ms17-010.aspx
- Microsoft guidance: https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/
- Tech data: https://gist.github.com/rain-1/989428fa5504f378b993ee6efbc0b168
- WannaCry's payoff: http://howmuchwannacrypaidthehacker.com