WannaCry virus is a ransomware that uses the EternalBlue Exploit to infect Microsoft Windows computers. Once it enters the target system, it quickly encrypts all files and adds the following extensions: wcry, wncryt and wncry. After the virus encrypts files using very strong encryption algorithms, it leaves a ransom note called "Please Read Me! .Txt" on the desktop and runs an application called "Wanna Decrypt0r". Bitcoin rushes to pay the ransom fee or threatens to delete files within 7 days.

Wannacry, which started to spread in early 2017, seized 300,000 computers in more than 150 countries, according to the latest statement by the European Police Office Europol. In today's technology, if anyone can access the programs on your computer without your permission, that computer is no longer yours on the system. Security attempted by the admin will not work. Systems are as safe as user reliability.

Wannacry in 2017;

- Russia has a wide list of victims, from banks to ministries, from the state-owned railways company to the country's second largest telecom network.
- In England and Scotland, the National Health System (NHS) is reported to have collapsed. It is shared that besides at least 33 health institutions, some family medicine clinics were also affected by the attack, some hospitals could not be operated and patients were not admitted except in emergencies.
- Spain's telecom company Telefonica, energy company Iberdrola and utility company Gas Natural;
- ticket machines at local train stations in Germany;
- Computer lab of a university in Italy;
- In France, Renault and also Renault Bursa factory had to stop production 24 hours.
- Among locations in the USA affected by FedEx WannaCry.
- China has not made a statement about the virus yet, but according to the posts on social media, it is stated that a university's computer lab is affected.

- Finally, on March 29, 2018, Boeing's manufacturing facility admitted that the WannaCry was attacked and production was disrupted to improve its systems.

If there is a security vulnerability in a system, it will definitely be used one day. If it has not been used until today, it is not your turn yet. Get professional help before it's late and check your systems with a security test.