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REZM Ransomware (.rezm File Extension)

REZM 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 $490 to $980 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 Rezm:


NameRezm Virus
Version0211
File Extension.rezm
Contact[email protected], [email protected]
FamilySTOP/Djvu Ransomware
Note_readme.txt
Offline IDoTNOXYrFxLZ6FFJDHoOj4iFOlC2xJsN3KurV05t1
Last seenNovember 04, 2024
AlgorithmSalsa20 encryption. If Rezm 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 .rezm files in the future.
RansomFrom $490 to $980 (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----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA3nLBI2B8+UYF4kAV3JxI qeYfgDipIdGBtTJI+Vx6LqOpMYXzFthpYm8amGnEVqNOCth9iH5eluXo4ZwTejsE eoB3UX/5lUPxT20RrVu2ksbnJPFV8Mb4sGkZ7dlSWm4kF2N1ue96AjJPju99NKJB aWtAFftCLUMXJeasvvgWxBUVH/5ht5glQdLIoaFy7O4VzH6OmiuRD8zPb0gM6+ss 9FQUsnfhsNrWkiLuGhth5EL6Tbd7bmWxqH10NCwUPhYIMM74VKZeN9pzDTxJrO0c t62YMvfN+Ngr4F2f6+sT/L5wYMt53KQw9epltOZb3mbqcp2ZqozdCg9gD26H9lGF lwIDAQAB -----END PUBLIC KEY-----
Other variants
  • Rooe Ransomware (.rooe encrypted files)
  • Alka Ransomware (.alka encrypted files)
  • Repp Ransomware (.repp encrypted files)
  • REZM Virus Removal Tool

    What is Rezm?

    Malware can manifest in various forms, some of which are particularly perilous. Rezm 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.

    Rezm Encryption process

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

    .REZM 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 Rezm 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.

    Rezm 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 photos, 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:
    https://we.tl/t-yVc390S6cs
    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]

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    Indicators of Compromise(IOC)

    File NameMD5File Size
    📜 SAMPLE.EXE6e07bae0b60897abceaefbdc1219a3d0822272
    📜 SAMPLE.EXE59e53cc4c3a9cb4d0b965ec637bcf16929229445