What is CryptoWall Ransomware?

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A Trojan Horse is used by the ransomware virus known as CryptoWall to encrypt files on a hacked computer, and users must pay a ransom to get the decryption key. A spam email, a malicious online advertisement, a compromised website, or another piece of malware are frequently used to spread Cryptowall. When Cryptowall is activated, it encrypts any files on the drive with a specific extension and leaves files with information on how to pay a ransom and obtain the decryption key.

It is renowned for disguising its viral payload as an innocent-looking application or file. As part of its payload, infected systems' files are encrypted in an effort to extort money in exchange for the decryption key.

Because the infection gives the user a way to get rid of the danger and restore all of their files in exchange for paying a ransom, CryptoWall and similar viruses are also known as "ransomware." The user can download and run a file and application to remove the infection or, in this example, to decrypt the encrypted files and restore them to a usable state after making a payment.

When it comes to infection origins, it is known that the virus, also known as a "drive-by download", is most frequently transmitted via email attachments and compromised websites.

Further extending its reach, CryptoWall has links to various Ad sites that deliver advertisements for numerous popular websites that consumers frequently visit.

How Does CryptoWall Infect Your Device?

As previously indicated, the virus infection procedure is rather typical. But once it has control of the host machine, it creates a network connection to unrelated servers, where it uploads connection details, including the public IP address, the server's location, and system details like the operating system.

Next, a 2048-bit RSA key pair unique to your computer will be created by the remote server. It begins the process of copying each file on its predetermined list of supported file extensions after copying the public key to the PC. The original file is erased from the hard drive when a copy is made, encrypted using the public key.

Until all of the allowed file types' compatible files have been copied and encrypted, this operation will keep going. This applies to files that are stored on other drives, including network shares and external drives; in general, the list will contain any drive that has been given a drive letter. Additionally, updates will propagate to cloud storage, which keeps a local copy of the contents on the drive when the files are modified.

Finally, after encryption is complete, CryptoWall will perform specific commands locally to terminate the Volume Shadow Copy Service (VSS), which is a service that is present in all current iterations of Windows. The service that manages data backup and restoration on a host machine is called VSS. Additionally, it manages file versioning, a Windows 7 feature that records the history of file changes. In the event of an unintentional alteration or catastrophic occurrence that compromises the integrity of the file, it may be rolled back or restored to a prior version. The virus's command stops the service entirely and also adds the option to clear/delete the cache, making it even more challenging to recover files using system restore or versioning.

How Does It Work?

  • The victim first becomes infected after opening an email that contains a link that leads to several compromised domains.

  • The system is infected with a downloader when the potential victim clicks the link.

  • The downloader establishes connections to several hacker-controlled domains where it can download CryptoWall.

  • The downloader establishes connections to several hacker-controlled domains where it can download CryptoWall.

  • The system data is encrypted by the malware.

  • On the screen, a notice with payment information for the decryption key is displayed.

How to Protect Your Device from CryptoWall?

The CryptoWall virus is cheap and simple to use. It spreads swiftly and targets those who ultimately pay the ransom in the hope of recovering their files. In order to safeguard data against the CryptoWall virus and any of its versions, continual monitoring is required. Installing the best antivirus software on your computer can help you prevent all forms of cyberattacks.

In addition, you can take the following measures to protect your device from CryptoWall −

  • Don't click on links in emails from anonymous senders. For CryptoWall, this is the primary means of propagation.

  • In emails that you get from unknown email addresses, avoid clicking any links.

  • Make a backup account of all of your important data. Keep the backup somewhere other than the same drive as your current operating system. You cant be able t access the backup if CryptoWall has infected your PC.

  • Ensure that CryptoWall is recognized and blocked by your security program.

  • By modifying the security options in your web browser, you can increase your level of online protection.

  • Utilize the most recent security patches to keep your Windows operating system and any vulnerable software up to date.

The same group of cyber criminals that are suspected of creating Cryptolocker, CryptoDefense, BitCrypt, Cryptorbit, and Critroni is thought to have created the CryptoWall Locker malware. All of the aforementioned CryptoWall ransomware is distributed by Trojan Horses, which may also send out phishing emails and exploit kits. All Windows versions, including Windows XP, Windows Vista, Windows 7, and Windows 10, can be infected by ransomware due to its potency.

Updated on 05-Aug-2022 12:41:25