What is WannaCry?

*What is WannaCry?*
First and foremost, let’s clarify exactly what WannaCry is. This malware is a scary type of trojan virus called “ransomware.” As the name suggests, the virus in effect holds the infected computer hostage and demands that the victim pay a ransom in order to regain access to the files on his or her computer.

*What exactly does WannaCry do?*
RansomWare like WannaCry works by encrypting most or even all of the files on a user’s computer. Then, the software demands that a ransom be paid in order to have the files decrypted. In the case of WannaCry specifically, the software demands that the victim pays a ransom of $300 in bitcoins at the time of infection. If the user doesn’t pay the ransom without three days, the amount doubles to $600. After seven days without payment, WannaCry will delete all of the encrypted files and all data will be lost.

*bitcoin*     

a type of digital currency in which encryption techniques are used to regulate the generation of units of currency and verify the transfer of funds, operating independently of a central bank.

About Ransome ware virus
Wide-ranging attacks involving encryption-based ransomware began to increase through Trojans such as CryptoLocker, which had procured an estimated US$3 million before it was taken down by authorities,and CryptoWall, which was estimated by the US Federal Bureau of Investigation (FBI) to have accrued over $18m by June 2015.

How it works
[attacker→victim] The attacker generates a key pair and places the corresponding public key in the malware. The malware is released.
[victim→attacker] To carry out the cryptoviral extortion attack, the malware generates a random symmetric key and encrypts the victim's data with it. It uses the public key in the malware to encrypt the symmetric key. This is known as hybrid encryption and it results in a small asymmetric ciphertext as well as the symmetric ciphertext of the victim's data. It zeroizes the symmetric key and the original plaintext data to prevent recovery. It puts up a message to the user that includes the asymmetric ciphertext and how to pay the ransom. The victim sends the asymmetric ciphertext and e-money to the attacker.
[attacker→victim] The attacker receives the payment, deciphers the asymmetric ciphertext with the attacker's private key, and sends the symmetric key to the victim. The victim deciphers the encrypted data with the needed symmetric key thereby completing the cryptovirology attack.
The symmetric key is randomly generated and will not assist other victims. At no point is the attacker's private key exposed to victims and the victim need only send a very small cipherte

Ransomware attacks are typically carried out using a Trojan, entering a system through, for example, a downloaded file or a vulnerability in a network service. The program then runs a payload, which locks the system in some fashion, or claims to lock the system but does not (e.g., a scareware program). Payloads may display a fake warning purportedly by an entity such as a law enforcement agency, falsely claiming that the system has been used for illegal activities, contains content such as pornography and "pirated" media

Don't try to open unknown mail consists of
here is a full list of the filetypes that are targeted and encrypted by WannaCry:

.123
.3dm
.3ds
.3g2
.3gp
.602
.7z
.ARC
.PAQ
.accdb
.aes
.ai
.asc
.asf
.asm
.asp
.avi
.backup
.bak
.bat
.bmp
.brd
.bz2
.cgm
.class
.cmd
.cpp
.crt
.cs
.csr
.csv
.db
.dbf
.dch
.der
.dif
.dip
.djvu
.doc
.docb
.docm
.docx
.dot
.dotm
.dotx
.dwg
.edb
.eml
.fla
.flv
.frm
.gif
.gpg
.gz
.hwp
.ibd
.iso
.jar
.java
.jpeg
.jpg
.js
.jsp
.key
.lay
.lay6
.ldf
.m3u
.m4u
.max
.mdb
.mdf
.mid
.mkv
.mml
.mov
.mp3
.mp4
.mpeg
.mpg
.msg
.myd
.myi
.nef
.odb
.odg
.odp
.ods
.odt
.onetoc2
.ost
.otg
.otp
.ots
.ott
.p12
.pas
.pdf
.pem
.pfx
.php
.pl
.png
.pot
.potm
.potx
.ppam
.pps
.ppsm
.ppsx
.ppt
.pptm
.pptx
.ps1
.psd
.pst
.rar
.raw
.rb
.rtf
.sch
.sh
.sldm
.sldx
.slk
.sln
.snt
.sql
.sqlite3
.sqlitedb
.stc
.std
.sti
.stw
.suo
.svg
.swf
.sxc
.sxd
.sxi
.sxm
.sxw
.tar
.tbk
.tgz
.tif
.tiff
.txt
.uop
.uot
.vb
.vbs
.vcd
.vdi
.vmdk
.vmx
.vob
.vsd
.vsdx
.wav
.wb2
.wk1
.wks
.wma
.wmv
.xlc
.xlm
.xls
.xlsb
.xlsm
.xlsx
.xlt
.xltm
.xltx
.xlw
.zip

It directly effects the same to system 32

At last Microsoft machines affected
What is the WannaCry virus?
The WannaCry virus targets Microsoft's widely used Windows operating system.

The virus encrypts certain files on the computer and then blackmails the user for money in exchange for the access to the files.

It leaves the user with only two files: Instructions on what to do next and the Wanna Decryptor program itself.

Use Ubuntu or Linux based any platform👍