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The WannaCry ransomware attack was a worldwide cyberattack in May 2017 by the WannaCry ransomware cryptoworm, which targeted computers running the Microsoft Windows operating system by encrypting data and demanding ransom payments in the Bitcoin cryptocurrency. [4]
Rensenware was developed by Korean undergraduate student and programmer Kangjun Heo for Windows operating systems out of boredom as a joke within the Touhou Project fandom. [1] [2] When executed, the program scans and encrypts all files on the computer that end in certain extensions using AES-256 and appends ".RENSENWARE" to the filename. [3]
There are a number of tools intended specifically to decrypt files locked by ransomware, although successful recovery may not be possible. [2] [155] If the same encryption key is used for all files, decryption tools use files for which there are both uncorrupted backups and encrypted copies (a known-plaintext attack in the jargon of cryptanalysis.
DoublePulsar is a backdoor implant tool developed by the U.S. National Security Agency's (NSA) Equation Group that was leaked by The Shadow Brokers in early 2017. [3] [citation needed] The tool infected more than 200,000 Microsoft Windows computers in only a few weeks, [4] [5] [3] [6] [7] and was used alongside EternalBlue in the May 2017 WannaCry ransomware attack.
[6] [12] [13] A separate effort from French cybersecurity researchers found a method to unlock and decrypt affected computers without having to pay the ransom. [14] Hutchins' work, as MalwareTech, to stop WannaCry, was highly praised, but this led to the press figuring out Hutchins' identity behind MalwareTech in the days that followed.
CryptoLocker typically propagated as an attachment to a seemingly innocuous email message, which appears to have been sent by a legitimate company. [5] A ZIP file attached to an email message contains an executable file with the filename and the icon disguised as a PDF file, taking advantage of Windows' default behaviour of hiding the extension from file names to disguise the real .EXE extension.
The EternalBlue exploit had been previously identified, and Microsoft issued patches in March 2017 to shut down the exploit for Windows Vista, Windows 7, Windows 8.1, Windows 10, Windows Server 2008, Windows Server 2012, and Windows Server 2016. However, the WannaCry attack progressed through many computer systems that still used older Windows ...
After encryption, a message (displayed on the user's desktop) instructs them to download the Tor browser and visit a specific criminal-operated Web site for further information. The website contains instructions that demand a ransom payment between 0.5 and 1 bitcoin (as of November 2017, one bitcoin varies in value between $9,000 and $10,000 ...