Gridinsoft Logo

QUAL Ransomware (.qual File Extension)

QUAL 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 $499 to $999 in Bitcoins for the decryption key.

You may be interested in taking a look at our other antivirus tools:
Trojan Killer, and Online Virus Scanner.

About Qual:


NameQual Virus
Version0876
File Extension.qual
Contact[email protected], [email protected]
FamilySTOP/Djvu Ransomware
Note_readme.txt
Offline IDKLbRmn6on3AXGFgDLGtd0IkHmV7uHw9VxlcxO5t1
Last seenSeptember 16, 2024
AlgorithmSalsa20 encryption. If Qual 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 .qual files in the future.
RansomFrom $499 to $999 (in Bitcoins)
Damage
  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----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA2iF2z8qTGWyGMtNhPR7G MGAf/Cj6VowurSUOyORyuV6zmACc4fML4hGZe2+jMtlmPuDm9AKDe2A7ktEm+8AV WTov1Vz9zeVkt6hy7KlP+fM+wTiEtwbYALKQV0RCYHyhH8z36Dco/dcL+M+OSwcd J9jJ5VBro0+QMbS+FRjk0GS4DwzprGjSwPLJWp4H1iZHhEcUplB4krFkwsyNfhb/ aiJzA/4ZYz/+hPdv9YQxd3R+bgv2LdzV605176wsakPezqJxUSHxOEkkpYP4P149 XsXG76vTNjWPRW/M3+oKBtMvAXzMYuRR9q1peV++b1l6hgkiuqDicGvT9JPCUDld 4QIDAQAB -----END PUBLIC KEY-----
Other variants
  • Waqa Ransomware (.waqa encrypted files)
  • Watz Ransomware (.watz encrypted files)
  • Veza Ransomware (.veza encrypted files)
  • QUAL Virus Removal Tool

    What is Qual?

    Malware can manifest in various forms, some of which are particularly perilous. Qual ransomware stands as a prime example of one of the most threatening viruses currently known. Rather than destroying your operating or file systems, it renders your files inaccessible and strategically inhibits the use of antivirus software by its victims.

    This malware employs the Salsa20 encryption algorithm, whose potency is derived from the vast number of possible decryption keys. Further complicating matters, each victim is assigned a unique key stored on a remote server controlled by cybercriminals. The only recourse for retrieving the keys is to pay the ransom or hope for law enforcement to intervene successfully.

    The method of infection is also noteworthy. The STOP/Djvu ransomware variants predominantly proliferate via third-party websites offering “free” versions of popular software. By tampering with the software's license verification to enable unpaid use, perpetrators can embed malware within the program's code. The type of malware you end up with—be it through a “free” version of MS Office or Anti-Malware — depends on the financial arrangements made with the malware distributors.

    Qual Encryption process

    The Qual 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 - ".qual". Then, ransomware creates a _readme.txt file in the folder where the encrypted file is located, and goes to the next folder.

    .QUAL 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 Qual 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.

    Qual note:

    Ransom note is the same for the whole STOP/DJVU 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:

    ATTENTION!

    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.
    Do not ask assistants from youtube and recovery data sites for help in recovering your data.
    They can use your free decryption quota and scam you.
    Our contact is emails in this text document only.
    You can get and look video overview decrypt tool.
    Price of private key and decrypt software is $999.
    Discount 50% available if you contact us first 72 hours, that's price for you is $499.
    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 .qual Files?

    Indicators of Compromise(IOC)

    File NameMD5File Size
    📜 SAMPLE.EXEa849c8e77640b84fb11c61c2caeaef24856576
    📜 SAMPLE.EXEde2786daeb3f25af88293720009c830a857600
    📜 SAMPLE.EXE9bfb9efe03b6423b7c4d10af940a3ff5857088
    📜 SAMPLE.EXE503fda54fd9a92becde1de2d569cdae9857600
    📜 SAMPLE.EXE9143118f2e37f2dccf64f77c35003c3a857600
    📜 SAMPLE.EXEec4581a508c9c24c5bec1215c001eb6f859136
    📜 SAMPLE.EXEcf184028b29f3d4c67d9391b5c6ab675767488
    📜 SAMPLE.EXE2c5bdf43d0d9ac053c2d7550db7faf4c767488
    📜 SAMPLE.EXEed6466980b57e9479e511308cc0558f8766976
    📜 SAMPLE.EXEf75319b6081e42710b22f12ef80fbd46766976