How to Beat the Cdtt Ransomware and Get Your Files Back in 2024

Ransomware is one of the most annoying and dangerous cyber threats that can ruin your day and your data. It’s a type of malware that encrypts your files and demands a ransom for the decryption key. If you don’t pay, you may lose your files forever.

One of the latest variants of ransomware is called Cdtt, and it belongs to the notorious Djvu family. It targets various types of files, such as documents, photos, videos, and more. It adds the “.Cdtt” extension to the encrypted files, making them inaccessible. It also drops a ransom note named “_readme.txt” on your desktop and in every folder with encrypted files. The note instructs you to contact the attackers via email and pay $980 (or $490 if you hurry) in Bitcoin to get the decryption tool and the unique key.

Sounds scary, right? Well, don’t panic. There is a way to remove the Cdtt ransomware and recover your files without paying the ransom. In this blog post, I will show you how to do it step by step, using some free tools and resources. I will also give you some tips on how to prevent ransomware infections in the future. Let’s get started!

Step 1: Disconnect from the internet

The first thing you need to do if you suspect that your computer is infected with Cdtt ransomware is to disconnect from the internet. This will prevent the malware from spreading to other devices on your network or contacting its command and control server. You can do this by unplugging the ethernet cable, turning off the Wi-Fi, or switching to airplane mode.

Step 2: Identify the type of ransomware attack

The next step is to identify the type of ransomware attack you are dealing with. This will help you find the best solution for removing the malware and decrypting the files. There are two main types of ransomware: locker and crypto.

  • Locker ransomware locks your entire screen and prevents you from accessing your computer. It usually displays a fake warning message from a law enforcement agency or a tech support company, claiming that you have violated some laws or that your system has been compromised. It asks you to pay a fine or a fee to unlock your computer. An example of locker ransomware is Reveton.
  • Crypto ransomware encrypts your individual files and allows you to use your computer normally. It usually leaves a ransom note on your desktop or in the folders with encrypted files, explaining that you need to pay a certain amount of money to get the decryption key. An example of crypto ransomware is Cdtt.

To identify the type of ransomware attack, you can use a free online service called ID Ransomware. It allows you to upload a ransom note or an encrypted file and it will tell you the name and the family of the ransomware, as well as the possibility of decryption. You can access it here: ID Ransomware.

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In this case, I uploaded the “_readme.txt” file and the service identified the ransomware as Cdtt, a variant of the Djvu family. It also gave me some useful information about the encryption method and the decryption options.

Step 3: Remove the Cdtt ransomware malware

Before you can attempt to decrypt your files, you need to remove the Cdtt ransomware malware from your computer. Otherwise, it may encrypt your files again or interfere with the decryption process. To do this, you need to use a reliable antivirus or anti-malware tool that can detect and remove ransomware infections.

One of the best tools for this purpose is Gridinsoft Anti-Malware. It is a powerful and user-friendly software that can scan your computer for malware and remove it with a few clicks. It also has a Trojan Killer feature that can help you remove ransomware from a locked PC. You can download it here: Gridinsoft Anti-Malware.

To remove the Cdtt ransomware malware with Gridinsoft Anti-Malware, follow these steps:

  • Download and install Gridinsoft Anti-Malware on your computer.
  • Launch the program and click on the “Scan” button.
  • Wait for the scan to complete and review the results.
  • Select all the detected malware items and click on the “Fix Now” button.
  • Restart your computer if prompted.

Step 4: Recover your encrypted files

After you have removed the Cdtt ransomware malware from your computer, you can try to recover your encrypted files. There are two possible ways to do this: decrypting or restoring.

Decrypting your files

Decrypting your files means using a special tool that can reverse the encryption and restore the original content of your files. This is the ideal solution, but it is not always available. It depends on the type and the version of the ransomware, as well as the encryption method and the key used.

Some ransomware variants use weak or flawed encryption algorithms that can be cracked by security researchers. They create free decryption tools that can help the victims recover their files without paying the ransom. You can find some of these tools here: No More Ransom and Emsisoft Decryptors.

Unfortunately, Cdtt ransomware is not one of them. It uses a strong and secure encryption algorithm called Salsa20, which is impossible to break without the key. The key is unique for each victim and is stored on a remote server controlled by the attackers. The only way to get the key is to pay the ransom, which is not recommended.

However, there is a small chance that you can decrypt your files if you are lucky. Cdtt ransomware uses two types of keys: online and offline. The online key is generated randomly for each victim and is sent to the server. The offline key is used when the ransomware cannot connect to the server, for example, if the victim is offline or if the server is down. The offline key is the same for all victims who were infected in this way.

If your files were encrypted with the offline key, you may be able to decrypt them with a free tool called STOPDecrypter. It is created by a security researcher named Michael Gillespie, who managed to obtain some of the offline keys from the attackers or from the victims who paid the ransom. You can download it here: STOPDecrypter.

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To decrypt your files with STOPDecrypter, follow these steps:

  • Download and run STOPDecrypter on your computer.
  • Select the folders or the drives that contain the encrypted files.
  • Click on the “Decrypt” button and wait for the process to finish.

If your files were encrypted with the online key, you will not be able to decrypt them with STOPDecrypter. You will see a message saying “No key for ID: {your ID}”. In this case, you will have to try the other option: restoring your files.

Restoring your files

Restoring your files means using a backup or a data recovery tool to recover the original or the previous versions of your files. This is the alternative solution, but it is not always effective. It depends on the availability and the quality of the backup or the recovery source, as well as the extent of the damage caused by the ransomware.

The best way to restore your files is to use a backup that you have created before the ransomware infection. A backup is a copy of your files that is stored on a separate device or a cloud service. If you have a backup, you can easily restore your files by copying them back to your computer. However, you need to make sure that your backup is not infected or overwritten by the ransomware. You also need to remove the ransomware malware from your computer before restoring your files.

If you don’t have a backup, you can try to use a data recovery tool that can scan your hard drive and recover the deleted or overwritten files. When the ransomware encrypts your files, it may delete the original files or create new encrypted files and overwrite the original ones. In some cases, the deleted or overwritten files are not completely erased and can be recovered with a data recovery tool. However, this is not a guarantee, as the ransomware may use a secure deletion method or the files may be corrupted or damaged.

One of the best data recovery tools for this purpose is PhotoRec. It is a free and open-source software that can recover various types of files from different storage devices. It works by looking for the file signatures and ignoring the file system structure. You can download it here: PhotoRec.

To restore your files with PhotoRec, follow these steps:

  • Download and run PhotoRec on your computer.
  • Select the disk that contains the encrypted files and press Enter.
  • Select the partition type and press Enter.
  • Select the file system type and press Enter.
  • Select a destination folder where the recovered files will be saved and press C.
  • Wait for the recovery process to finish and check the destination folder for your files.

FAQs

Here are some frequently asked questions and answers about the Cdtt ransomware and how to remove it and recover your files.

Q: How did I get infected with the Cdtt ransomware?

A: There are many ways that you can get infected with the Cdtt ransomware, but the most common ones are:

  • Opening a malicious email attachment or a link that downloads and runs the ransomware on your computer.
  • Visiting a compromised website that hosts the ransomware or redirects you to a malicious site that does the same.
  • Downloading and installing a fake or cracked software that contains the ransomware or downloads it from a malicious source.
  • Connecting an infected removable device, such as a USB flash drive or an external hard drive, that runs the ransomware automatically.
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To avoid getting infected with the Cdtt ransomware or any other ransomware, you should follow these basic security tips:

  • Do not open suspicious or unsolicited emails or attachments, and do not click on unknown or dubious links.
  • Do not visit untrusted or illegal websites, and do not download or install pirated or cracked software.
  • Keep your operating system and your applications updated with the latest security patches.
  • Use a reputable antivirus or anti-malware software and keep it updated and active.
  • Backup your important files regularly and store them on a separate device or a cloud service.

Q: Can I trust the Cdtt ransomware attackers and pay the ransom?

A: No, you should not trust the Cdtt ransomware attackers and pay the ransom. There are several reasons why this is a bad idea:

  • There is no guarantee that they will send you the decryption tool and the key after you pay the ransom. They may ignore you, ask for more money, or send you a fake or malicious tool that can harm your computer or encrypt your files again.
  • Even if they send you the decryption tool and the key, there is no guarantee that they will work properly and decrypt your files. The tool may be faulty, incompatible, or incomplete, and the key may be wrong, corrupted, or expired. You may end up with damaged or unrecoverable files.
  • By paying the ransom, you are encouraging the Cdtt ransomware attackers and other cybercriminals to continue their malicious activities and infect more victims. You are also funding their operations and helping them develop more sophisticated and dangerous ransomware variants.

Therefore, you should not pay the ransom and instead try to remove the Cdtt ransomware and recover your files using the methods described in this blog post.

Q: How can I prevent the Cdtt ransomware or any other ransomware from infecting my computer again?

A: To prevent the Cdtt ransomware or any other ransomware from infecting your computer again, you should follow these best practices:

  • Backup your important files regularly and store them on a separate device or a cloud service. This way, you can always restore your files in case of a ransomware attack or any other data loss scenario.
  • Use a reputable antivirus or anti-malware software and keep it updated and active. This will help you detect and remove any ransomware or other malware infections before they can cause any damage.
  • Use a firewall and a VPN to protect your network and your online activities. This will help you block any unauthorized or malicious connections or requests that may try to infect your computer with ransomware or other malware.
  • Use strong and unique passwords for your accounts and devices, and enable two-factor authentication whenever possible. This will help you prevent any unauthorized access or compromise of your accounts or devices that may lead to a ransomware infection or data theft.
  • Be careful and vigilant when using the internet and your email. Do not open suspicious or unsolicited emails or attachments, and do not click on unknown or dubious links. Do not visit untrusted or illegal websites, and do not download or install pirated or cracked software.

Conclusion

In this blog post, I have shown you how to remove the Cdtt ransomware and recover your files without paying the ransom. I have also given you some tips on how to prevent ransomware infections in the future. I hope you found this post helpful and informative. If you have any questions or comments, please feel free to leave them below. Thank you for reading and stay safe! ?

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