Cdtt Virus Ransomware (.cdtt File)

Cdtt Virus is a strain within the STOP/Djvu Ransomware family, employing the Salsa20 encryption algorithm to encrypt files on compromised systems. Victims are coerced into paying a ransom ranging from $999 to $1999 in Bitcoins for the decryption key.

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About Cdtt Ransomware:

NameCdtt Virus
File Extension.cdtt
Contact[email protected], [email protected]
FamilySTOP/Djvu Ransomware
Offline IDBn3q97hwLouKbhkQRNO4SeV07gjdEQVm8NKhg0t1
Last seenJanuary 10, 2024
AlgorithmSalsa20 encryption. If Cdtt cannot establish a connection to crooks server before starting the encryption process, it uses the offline key. This key is the same for all victims(!), making it possible to decrypt .cdtt files in the future.
RansomFrom $999 to $1999 (in Bitcoins)
  1. ⮞ Can delete Volume Shadow copies to make victim’s attempts to restore data impossible;
  2. ⮞ Adds a list of domains to HOSTS file to block access to certain security-related sites;
  3. ⮞ Installs password-stealing trojan virus, like Redline Stealer, Vidar Stealer, Smokeloader, Azorult and others;
DistributionThird-party downloaders, installers, peer-to-peer networks, RDP exploits, etc.,
RSA Public Key-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAr0GLq/mHXqBal7ucID+c cFScc8/W1OCT0GTCVzJgxoMkEGJZqNselbUtChT0yNq5BFkt44IkH/PtixxLTHYo EmqbXelDPaljN+zsslk8klrc0Or3AWuqZ/1RR7QbtctpTFJ9hiD0FP1pE4MjvbXb f7KvBkAnDRnPXWcZpw7NvDbt1XOa2cptFcsH7lOLWhFuskkOcE15lQ485pNSOkcm VXpam/yhHl5jrHs4ue0uSBXJ1yeJqQT/312wZma6ho0sDTHqC3/+4+Md8LF8p0OD /bmb+kMQv0Oaou31VupP4C2qlkjZLaPqzjX/amkyo8iQ/1bRZQW5ZbtbXFlFb/4M /wIDAQAB -----END PUBLIC KEY-----
Other variants
  • Cdpo Ransomware (.cdpo encrypted files)
  • Cdaz Ransomware (.cdaz encrypted files)
  • Cdwe Ransomware (.cdwe encrypted files)
  • Cdtt Virus Ransomware (.cdtt) File - How does it work?

    What is Cdtt ransomware?

    Cdtt ransomware is a virus that is worth being afraid of. It encrypts your files and asks for a ransom, and also crushes several vital system elements. Struggling to open certain web pages, inability to make the But the knowledge of who is your enemy is 50% of the wind upon this enemy.

    The Salsa20 encryption algorithm, which is used by ransomware, is almost impossible to “hack”. The key length is too big, and the total amount of possible keys is huge, so any kind of brute force will require too much time (or an unreally powerful computer). Trying to use the already compromised decryption keys is a way, but the efficiency of apps that offer such a function is pretty low.

    Ransomware gets on your PC, not through magic. Cdtt ransomware uses dubious programs as the primary method of its distribution. “Free” versions of popular apps, cheat engines, Windows activators, and keygens are the most popular shells for all STOP/Djvu ransomware families, and the Cdtt virus is not an exclusion. Paying a small sum for a license is much easier than paying almost $1000 for the file decryption.

    Encryption process

    The Cdtt ransomware uses the Salsa20 encryption algorithm. That is not the strongest method, but it still provides an overwhelming amount of possible decryption keys. To brute force the 78-digit number of keys, you need 3.5 unvigintillion years (1*10^65), even if you use the most powerful regular PC. Quantum computers can show a bit better results, but it is still too slow to get your files back while you are alive.

    The exact algorithm of encryption is next: malware scans each folder for the files it is able to encrypt. Then, when it finds the target, it makes a copy of your file, removes the original one, encrypts the copy and leaves it instead of the removed original. Such a procedure is done to prevent the situation when you have already opened the file, so ransomware is not able to read it because of the Windows restrictions. To each encrypted copy, the virus adds the specific extension - ".cdtt". Then, ransomware creates a _readme.txt file in the folder where the encrypted file is located, and goes to the next folder.

    .CDTT Files

    Such an encryption method can be exploited for file recovery. Since the original file is deleted, you may try to recover it using the file recovery tools. The less time is passed - the bigger the chance to get your files back, so hurry up!

    Another specific moment that can help you to use the files even after the encryption is the fact that Cdtt ransomware encrypts only the first 150KB of each file. Hence, you can try to run a big file, such as video or music, without the encryption. Similar feature also works with other ransomware families - Dharma, Conti and Makop encrypt the same 150KB.

    Ransom note: _readme.txt

    Ransom note is the same for the whole ransomware family. In fact, it is one of the main signs of to which family the certain ransomware belongs. Here is the typical note for STOP/Djvu family:


    Don't worry, you can return all your files!
    All your files like pictures, databases, documents and other important are encrypted with strongest encryption and unique key.
    The only method of recovering files is to purchase decrypt tool and unique key for you.
    This software will decrypt all your encrypted files.
    What guarantees you have?
    You can send one of your encrypted file from your PC and we decrypt it for free.
    But we can decrypt only 1 file for free. File must not contain valuable information.
    You can get and look video overview decrypt tool:
    Price of private key and decrypt software is $1999.
    Discount 50% available if you contact us first 72 hours, that's price for you is $999.
    Please note that you'll never restore your data without payment.
    Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours.

    To get this software you need write on our e-mail:
    [email protected]

    Reserve e-mail address to contact us:
    [email protected]

    Your personal ID:

    🔗 HowToFix.Guide: How To Decrypt .cdtt Files?

    Indicators of Compromise(IOC)

    File NameMD5File Size
    📜 SAMPLE.EXE32fbe6ae4b68107a8bd62276bcc066398108791
    📜 SAMPLE.EXE8b9ba9bf833fa984619178929803443d1273856
    📜 SAMPLE.EXEe6f92be7f819410f58178b2a32c02ece803328
    📜 SAMPLE.EXEe1e25cf99caaca5be73b35414a4a9a2b946816
    📜 SAMPLE.EXE9934846e208068c2a5371068e92ee1f47960974
    📜 SAMPLE.EXEd93e1466e510a116d3613caac34c8845688688
    📜 SAMPLE.EXE88c925303429aeb9bcec2e060fbf3d8911439438
    📜 SAMPLE.EXEbe1a93194fd9c33df52a6f2fea735e36811597824
    📜 SAMPLE.EXEa9db8ab310c59a03c4a3fefcce691eae1273856
    📜 SAMPLE.EXEcc134b8ddfe0681646ed11c0e3041876756736