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Nissan Motor Manufacturing UK in Tyne and Wear, England, halted production after the ransomware infected some of their systems.
Renault also stopped production at several sites in an attempt to stop the spread of the ransomware.
Before encrypting the files, the Crypto API that calls Windows generates a new pair of RSA key, known as the sub-public key and sub-private key. When decrypting a file, the attacker decrypts the sub-private key "00000000.eky" and saves the file as "00000000.dky" for decrypting the file after receiving the decrypted file.
And then, the sample encrypts the sub-private key with the original RSA public key and saves it as "00000000.eky" and the sub-public key is saved as "00000000.pky". The sample itself also has another pair of primary RSA public keys and private keys, which are used to decrypt the display files. If you want to decrypt the file, you need to acquire the RSA sub-private key, decrypt the AES key of the file header, and then use the AES key to decrypt files.
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The process of virus execution can be divided into three steps: the main program file uses the vulnerability to spread itself, and run "Wanna Cry" ransom program; "Wanna Cry" ransom program will encrypt the file; the ransom interface (@ Wana Decryptor @ .exe) displays the ransom information and decrypts the samples.
The scale of the attack and subsequent exposure of vulnerabilities prompted Microsoft to release new security updates for older versions of Windows that are no longer supported, including for Windows XP, Windows Server 2003, Windows XP Embedded and Windows 7 Embedded.
In a statement regarding the matter, the head of Microsoft’s Cyber Defense Operations Center, Adrienne Hall, said that “Due to the elevated risk for destructive cyber-attacks at this time, we made the decision to take this action because applying these updates provides further protection against potential attacks with characteristics similar to Wanna Crypt [alternative name to Wanna Cry]”.
As with other modern ransomware, the payload displays a message informing the user that files have been encrypted, and demands a payment of around 0 in bitcoin within three days, or 0 within seven days.
Three hardcoded bitcoin addresses, or "wallets", are used to receive the payments of victims.
Double Pulsar is a backdoor tool, also released by The Shadow Brokers on 14 April 2017, Starting from 21 April 2017, security researchers reported that computers with the Double Pulsar backdoor installed were in the tens of thousands.