OFLG Ransomware (.oflg Files)

OFLG Ransomware uses the AES-256 encryption algorithm. This STOP/Djvu family is one of the most popular infection!

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Technical details:

NameOFLG Virus
FamilySTOP/Djvu Ransomware
File Extenstion.oflg
AlgorithmAES-256 encryption. If OFLG 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 .oflg files in the future.
RansomFrom $490 to $980 (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 on the system, like Azorult Spyware;
DistributionThird-party downloaders, installers, peer-to-peer networks, RDP exploits, etc.,
Other variants
  • Ofww Ransomware (.ofww encrypted files)
  • Ofoq Ransomware (.ofoq encrypted files)
  • Adlg Ransomware (.adlg encrypted files)

  • OFLG ransomware belongs to the STOP/Djvu ransomware family. This malware family is usually targeted at individuals. Besides the statistics, this targeting can also be figured out through the specific distribution methods and actions this malware does after the injection. It encrypts the files with a robust cipher - AES-256, which is impossible to “hack”. All decryption keys are kept on the remote server, controlled by cybercriminals.

    This malware makes some changes to your system configuration. One of the most significant is stopping the Microsoft Defender and preventing the anti-malware software installation files from launching. These changes are done through the Group Policies - a particular interface in Windows for interaction with deep system settings.

    OFLG ransomware is usually spread through the dubious sites that offer the programs for free. Usually, you need to buy these programs, but these web pages make you a very tempting offer - get it without any payment. They make the programs usable without any licensing through hacking its source code. At the moment of source code editing, these crooks can easily add any sort of virus. Which one? Depending on how much they paid for the certain malware.

    Other sources of OFLG ransomware are so-called hack tools. Apps like keygens, Windows activation tools, cheat engines, and so on are perfect carriers for any kind of malware. Using them, you are risking not only getting infected with the OFLG virus but also being fined for unlicensed software usage by local authorities.

    Encryption process

    The OFLG ransomware uses the AES-256 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 - ".oflg". Then, ransomware creates a _readme.txt file in the folder where the encrypted file is located, and goes to the next folder.

    .OFLG 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 OFLG 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 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:
    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.
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    [email protected]
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