Qarj Ransomware (.qarj Files)

Qarj Ransomware uses the Salsa20 encryption algorithm. This STOP/Djvu family is one of the most popular infection!

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

About Qarj Ransomware:

NameQarj Virus
File Extenstion.qarj
Contact[email protected], [email protected]
FamilySTOP/Djvu Ransomware
Last seenMarch 16, 2023
AlgorithmSalsa20 encryption. If Qarj 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 .qarj files in the future.
RansomFrom $490 to $980 (in Bitcoins)
  1. โฎž Can delete Volume Shadow copies to make victimโ€™s attempts to restore data impossible;
  2. โฎž Adds a list of domains to HOSTS file to block access to certain security-related sites;
  3. โฎž Installs password-stealing Trojan, 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----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAu/Cl5VAPHD7s0flHV9k4 KbqAfRUsAP/a+Qe/oq+LZX013wQniPGx0w0JvBWmz9qtyTu0zJNXyQ8aZ3Q6rdhT E0uDxuPIxeKCH3GF0iG6eflR3AJ6XvWbJooZ2YYmeSUdrHtW8axIKJEZwcVbli6Q k+mieKINfHpYwbJTRcG269pLVWTQEJhjjx/VVRVS4ocsbmtBxpiO0NbOlqlumXab s2SHWSS8YPLvxa4Ivm1BGfOLlf/0U4xXuuXJq0z1IZQmA98sv4OY9IhPe9U0bAf9 yuVIh3kP9aikZFiBOTH0iPpt98vkPpMFzOunx42BZuweF67t6AYdVP/NEVR/nPyb UwIDAQAB -----END PUBLIC KEY-----
Other variants
  • Qapo Ransomware (.qapo encrypted files)
  • Qazx Ransomware (.qazx encrypted files)
  • Craa Ransomware (.craa encrypted files)
  • Qarj Ransomware (.qarj Files) - What is it? Keep Your Privacy Well

    Qarj 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 โ€œhackโ€. 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. Qarj ransomware uses dubious programs as the primary method of its distribution. โ€œFreeโ€ versions of popular apps, cheat engines, Windows activators, and keygens are the most popular shells for all STOP/Djvu ransomware families, and the Qarj 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 Qarj 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 - ".qarj". Then, ransomware creates a _readme.txt file in the folder where the encrypted file is located, and goes to the next folder.

    .QARJ 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 Qarj 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 $980.
    Discount 50% available if you contact us first 72 hours, that's price for you is $490.
    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:

    ๐Ÿ”— Remove Darj Virus Ransomware (+File Recovery)
    ๐Ÿ”— Remove Dazx Virus Ransomware (+File Recovery)
    ๐Ÿ”— Remove Dapo Virus Ransomware (+File Recovery)

    Indicators of Compromise(IOC)

    File NameMD5File Size
    ๐Ÿ“œ SAMPLE.EXE1e09d882c4fd751724c2938fffc80943196096
    ๐Ÿ“œ SAMPLE.EXE5a0b27b5ed58abd7e61522a97617ea0f1273856
    ๐Ÿ“œ SAMPLE.EXEd4d57efdb95f1a0479e5a084a1a306ba190464
    ๐Ÿ“œ SAMPLE.EXE5b175d9d5bf5a9afde2e24951c633660191488
    ๐Ÿ“œ SAMPLE.EXE069efa0c9e52f73ff4893fc283d72bb3191488
    ๐Ÿ“œ SAMPLE.EXEf2fbaee72e6246a062d984f01c50b190190464
    ๐Ÿ“œ SAMPLE.EXE18ae339e0e91d50afbcc92792988cd7d188928
    ๐Ÿ“œ SAMPLE.EXE5a4da40cab7919e20089f08fd61dd6f6316416