Restaurar arquivos criptografados através de RSA Encryption. Remove CryptoWall and Other Ransomware Manually - Como, Tecnologia e Fórum de Segurança PC | SensorsTechForum.com
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Restaurar arquivos criptografados através de RSA Encryption. Remove CryptoWall and Other Ransomware Manually

password-brute-force-stforumRansomware encryptions and infections have created havoc worth around 18 million USD. These type of attacks come from Trojan horses with preprogrammed scripts that encrypt the user files in mainly AES and RSA encryption algorithms. Ransomware infections have become a grave danger to inexperienced users who usually open email attachments without carefully thinking about their legitimacy. The threat itself can be removed with a particular anti-malware program, Contudo, the encrypted files remain. This is a tutorial to help users in decrypting RSA encrypted data. The methods below were recommended by experts and were tried several times by users with a good result. However this is no guarantee that it will work for you.

What Is RSA Encryption Algorhytm?

RSA encryption algorithm is a type of language that, nesse caso, changes the normal code of the file with a unique key. This key can be decrypted via special software, but it requires a powerful machine since it is a time-costly process. RSA algorithm has been employed by the most traditional ransomware viruses that have caused massive devastations on a global scale – The CryptoWall Variants(2.0, 3.0), Bitcrypt e outros. In this tutorial, we show you a possible method of decrypting your files and restoring them to their previous working state in case you have no backup on your operating system (OS). After the tutorial, we have provided instructions on how to enable Windows file history so your files can be backed up so you can protect yourself from future attacks. Make sure you take your time and do everything from the steps below and things should be fine for you.

Ransomware Removal Manual

Before doing this, make sure you backup your information on a USB stick or anything of this similarity. Depois disso, make sure you download a reputable anti-malware software that will detect anything out of the ordinary and assist you with the removal of the threat. Download it to a safe PC and put it on yours and boot your computer in Windows online Safe Mode using the following manual:

1. Start Your PC in Safe Mode to Remove Ransomware

1. Start Your PC in Safe Mode to Remove Ransomware.

Para o Windows XP, Vista, 7 sistemas:

1. Remova todos os CDs e DVDs, e reinicie o PC do “Começar” cardápio.
2. Selecione uma das duas opções que se seguem:

Para PCs com um único sistema operacional: pressione “F8” repetidamente após a primeira tela de inicialização aparece durante o reinício do seu computador. No caso do logotipo do Windows aparece na tela, você tem que repetir a mesma tarefa novamente.

Para PCs com múltiplos sistemas operacionais: ? He as setas irá ajudá-lo a selecionar o sistema operacional que você prefere para começar em Modo de segurança. pressione “F8” tal como descrito para um único sistema operacional.

3. Enquanto o “Opções avançadas de inicialização” aparece o ecrã, selecione os Modo de segurança opção desejada usando as teclas de seta. Como você fazer a sua selecção, pressione “Entrar“.
4. Fazer logon no seu computador usando sua conta de administrador

Enquanto o computador está no modo de segurança, as palavras “Modo de segurança” aparecerá em todos os quatro cantos da tela.

Para Windows 8, 8.1 e 10 sistemas:
Degrau 1: Abra o Menu Iniciar
Windows 10-0 (1)
Degrau 2: Enquanto segurando a tecla Shift botão, Clique em Poder e clique em Reiniciar.
Degrau 3: após a reinicialização, o menu aftermentioned aparecerá. A partir daí você deve escolher Solução de problemas.
Windows 10-1-257x300
Degrau 4: Você vai ver o Solução de problemas cardápio. A partir deste menu você pode escolher Opções avançadas.
Windows 10-2 (1)
Degrau 5: Depois de Opções avançadas aparece o menu, Clique em Definições de arranque.
Windows 10-3 (1)
Degrau 6: Clique em Reiniciar.
Windows 05/10 (1)
Degrau 7: Um menu aparecerá após a reinicialização. Você deve escolher Modo de segurança premindo o número correspondente e a máquina irá reiniciar.

2. Remove Ransomware automatically with SpyHunter Removal Tool.

2. Remove Ransomware automatically with Spy Hunter Malware – Ferramenta de remoção.

Para limpar o computador com o premiado software Spy Hunter – donload_now_140
É altamente recomendável para executar uma verificação do sistema antes de comprar a versão completa do software para se certificar de que a versão atual do malware podem ser detectadas por SpyHunter.

Ransomware Files Restoration

For this particular tutorial, we have used .bitcrypt extension files, encrypted by ransomware, called Bitcrypt. We have also used Ubuntu version 14.04 which assisted us in using special software appropriate for this distribution. You can get it from their website’s download page and you can either:

-Install it along with your operating system by booting a live USB drive.

-Install it on a virtual drive (Recomendado).

Here we have brief tutorials for both:

Installation of Ubuntu on your machine:

Passo 1: Get a USB flash drive that has above 2GB of space.

Passo 2: Download the free software, called Rufus from aqui and install it on your windows.

Etapa 3: Configure Rufus by choosing NTFS as a system and selecting the USB drive as the one to be created as a bootable USB. After that boot the Linux image from the following button:

rufus

Make sure you locate it and select it from where you downloaded it.

Passo 4: After the flash drive is ready, reinicie o computador, and it should run the Ubuntu installation. Se isso não acontecer, you should go to the BIOS menu by pressing the BIOS hotkey on startup for your PC (Usually it is F1) and from there select the first boot option to be the USB bootable drive or CD/DVD in case you have burnt Ubuntu on such.

Installation Of Ubuntu on your Virtual Drive

For this installation, you need to download VMware Workstation from their página de download or any other Virtual Drive Management program. After installed you should:

Passo 1: Create a new virtual drive.

Passo 2: Set the drive size. Make sure you have a minimum of 20 gigabytes of free space fro Ubuntu on your computer. Also choose ‘Run as a single drive’.

Degrau 3: Select the ISO image. For this option, you should know where it is.

Degrau 4: After that play the Virtual Machine and it will install automatically.

descriptografia arquivo

Once you have Ubuntu or any other Linux distribution on your computer open the terminal by doing the following:

Open-terminal

Then update your Linux and install greater version than Python 3.2 by typing the following in the terminal:

→sudo apt-get update
sudo apt-get install python3.2

Além disso, if your Linux does not have sqlite3 módulo, install it by typing:

sudo apt-get install sqlite3 libsqlite3-dev
sudo gem install sqlite3-ruby

Now after we have Python installed, we need to download a script created by 2014 Airbus Defence and Space Cybersecurity. To do this click on this ligação. Download the file in your ‘Homefolder after it prompts you where to save it. Keep this as decrypt.py in case it is not saved in this format.

Now that we have Python and the script, it is time to find out the key of the .bytrcypt encrypted file. To do this move your encrypted files ot the home folder by using the file manager:

File-manager

After you located all of the encrypted files there along with the “decrypt.py” file type the following into the terminal to initiate the script:

python ./decrypt.py “Your_Encrypted_Document_Name_and_Format”

It will show an error, and this is entirely normal as long as you see this code:

código

This is the RSA code for this file. Agora, we need to decrypt it, and we are halfway there. To do this download a program called cado-nfs2.0.tar.gz from their download page here. We recommend the 2.0 versão. Contudo, the newest version is also on a good level.

It will download a .tar archive file (.tar files are very similar to .rar or .zip files). Simply open it and click on the Extract button on top and choose the ‘Home’ pasta. It should look like this:

Extrair

After the we have all the files extracted in the ‘Home’ pasta, we need to compile cado-nfs. Para fazer isso, open another terminal and type:

cd cado-nfs-2.0
make

After this is set, it is time to run the key cracker. Important – this process can take from several hours to days to be finished. To begin the process type in your cd cado-nfs terminal:

→./factor.sh YOUR_UNIQUE_KEY_WHICH_IS_LETTERS_OR_NUMBERS_HERE -s 4 -t 6

After the process completes, você deve ver o seguinte:

→informações:Complete Factorization: Total cpu/real-time for everything: hhhh/dddd
LongNumber1 LongNumber2

After we have the decrypted key, we need to insert in the “decrypt.py” script. Do this by opening decrypt.py in a text editor and finding this part of it:

known_keys = { many long numbers }

We need to add before the second bracket (“}”) these lines:

The Previous Key, a column, opened parenthesis, LongNumber1, Comma, LongNumber2, closed parenthesis. It should look like this:

The Previous Key:(LongNumber1,LongNumber2)

Be advised that you should do this only one time. After this it is time to decode the files. To do this type:

python ./decrypt.pyYour_Encrypted_Document.docx.bitcrypt

Executing this command will make a file that is called Your_Encrypted_Document.docx.bitcrypt.CLEAR

Just rename the file by removing the .clear extension and you should be all set. Repeat the process for your other files as well. But remember that first you should find out their initial keys to decrypt them. You should be able to open them now. We hope this works for you.

Conclusão

The best defense against Ransomware threats is always the user himself. It is crucial to know which files you open and whether or not the locations of those files are safe or not. However if you are in an organization or somewhere where the computer is located in a public or work environment, it always opens it up to a direct attack that is even more dangerous. A real expert will say that the best computer is the one that is switched off, because it may have the best defenses, but the one who makes the errors is not the machine, it’s the man. This is why you should always keep enough knowledge and build up PC usage behavior that is security oriented.

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Berta Bilbao

Berta é um pesquisador de malware dedicado, sonhando para um espaço cibernético mais seguro. Seu fascínio com a segurança de TI começou há alguns anos atrás, quando um malware bloqueado la fora de seu próprio computador.

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41 Comentários

  1. Avatarlucas va

    Boa tarde,

    I get the error : “[-] Error parsing file footerwhen I execute decrypt.py on my file encrypted

    Reply
    1. AvatarSertab (pós autor)

      Hello Lucas,

      This may be due to one of the following reasons:

      1) Old python version.

      sudo apt-get update python

      2) Error in file name or command.

      Check the command you typed carefully. Can you tell me which one is it? If it is this one:

      python ./decrypt.pyMY ENCRYPTED FILE.jpg.bitcrypt

      it should be typed with the brackets exactly as seen above.

      3)Error in the ‘decrypt.py’ Arquivo

      In case it doesnt work you shouldnt try to look for the issue since you may lose a lot of your time in doing so.
      Your best bet is to try DecrypterFixer. Você pode baixá-lo aqui:

      https://bitbucket.org/DecrypterFixer/malware_tools-1/get/fa4ec9df293b.zip

      It has a well made ‘decrypt.pyfile and should work for you.

      In case the first web link is broken, try this one:

      https://bitbucket.org/DecrypterFixer/malware_tools-1/get/fa4ec9df293b.zip

      Reply
      1. Avatarlucas va

        Olá, thanks you for your reply.
        My file is not in .bitcrypt extension because I was infected by CryptoWall 3.0

        I will try your solutions, thanks you.
        I will come to give you a feedback

        Reply
        1. AvatarJohn John

          Olá ,, you have some look on this,, you recover your files? can I try ,, obrigado

          Reply
  2. Avatarpatrick

    Oi,
    Eu tenho o mesmo problema. My files are also infected by the Cryptowall 3.0. And the extension is ccc. Can I use this python script to decrypt ? Are there other possible solutions ?
    muito thx a
    Patrick

    Reply
    1. AvatarSertab (pós autor)

      Hello Patrick,

      We are sorry to hear your files have been encrypted by ransomware. The .ccc extension may not belong to the CryptoWall threat. There are variants of other ransomware that pretend to be Cryptowall 3.0, possibly because it is the most vicious of them all so far. There is a tool that may help you, known as Tesla decryptor. More information in the link below.

      We have started a new topic in our security forum, with the intention to help as many users as possible. There it is: http://sensorstechforum.com/forums/malware-removal-questions-and-guides/my-files-are-encrypted-with-the-ccc-extension-help!/

      Reply
      1. AvatarParawi

        Oi! All my files were encrypted by rsa4096, all has the extension .mp3. O que devo fazer? Thks

        Reply
  3. AvatarBrently

    I have a my VP’s computer at my desk right now that has the DecryptorMax ransomware. I have removed the trojan and malware in Safe Mode, but am looking for a way to decrypt the files. This has my VP’s first baby girl’s baby photos from the first couple months of her life, so these files are really important to her. They aren’t providing me the time to do the Linux decrypt, so looking for a tool. Hoping Kaspersky comes out with a tool to decrypt these. They have the crinf extension. Any help is appreciated.

    Reply
    1. Milena DimitrovaMilena Dimitrova

      Hi Brently, we’re about to start a topic in our forum about DecryptorMax, and we’re also going to research it in depth. Can you please clarify what you meant by saying ‘They aren’t providing me the time to do the Linux decrypt’?

      THX,

      a equipe STF

      Reply
  4. AvatarGil

    saudações,

    I am getting the following error when running decrypt.py

    python3.4 ./decrypt.py test.bitcrypt
    Arquivo “./decrypt.py”, linha 99
    print “uso: %s ” % sys.argv[0]
    ^
    SyntaxError: Missing parentheses in call to ‘print

    Any help would be great.

    Obrigado,

    Gil

    Reply
    1. Milena DimitrovaMilena Dimitrova

      Hi Gil,

      What ransomware are you dealing with?

      Please join our forum and follow the topic about SyntaxError: Missing parentheses in call to ‘print’:

      http://sensorstechforum.com/forums/malware-removal-questions-and-guides/how-to-fix-decrypt-py-'syntaxerror-missing-parentheses-in-call-to-print/

      Reply
  5. AvatarGab

    tão… just to double check if there’s no restore point and no shadow copy, there’s no way to get the files back from cryptowall 3.0 correct?
    Saudações

    Reply
  6. Avataryohji

    do you have a method to decrypt files that is encrypted using cryptowall 4

    Reply
    1. Milena DimitrovaMilena Dimitrova

      Hi yohji,

      Are you dealing with CryptoWall 4.0?

      Reply
      1. AvatarGab

        Would you help me with cryptowall 3.0 por favor.
        Saudações

        Reply
        1. Milena DimitrovaMilena Dimitrova

          Hi Gab,

          Can you please start a topic here: http://sensorstechforum.com/forums/malware-removal-questions-and-guides/

          desde já, obrigado :)

          Reply
      2. AvatarKJ

        Oi,
        My files were infected by cryptowall 4.0 with ‘help_your_files’.
        I removed the cryptowall 4.0 using anti-malware softwares.
        Can I use thedecrypt.pyscript to find out the key of the encrypted files by cryptowall 4.0?
        Would you tell me if you have other possible solutions for restoring the encrypted files?

        Saudações

        Reply
      3. AvatarMehmet

        Olá,
        Ich habe auch das selber probleme mit cryptowall virüs aber weiss es nicht genau,welche version das ist.
        Es gibt in jeder ordner einen bild mit HELP_YOUR_FILES

        und folgende dateien formate ; .DZ7 .O1R .7FT .1Q .7429D .0PQGL .BR4 .7UV .2PF Usw

        Können Sie mir bitte helfen?
        Ich habe sehr wichige fotos und text dokumenten.
        Mfg Mehmet

        Reply
        1. AvatarFran

          Hola Mehmet, has conseguido arreglar los archivos? Mi virus tenia el mismo archivo que el tuyo.

          Reply
        2. AvatarEffesse72

          Bom Dia, my problem is the same of your since 05/01/2016!

          Reply
  7. AvatarVencislav Krustev

    Olá, KJ as far as we know so far most methods for decrypting files encrypted by cryptowall 4.0 have proven to be unsuccessful even by law enforcement. However what you can try is ask a question in the Cryptowall 4.0 topic in our forum and wait to see if you get any help from other affected users and experts in this subject. Here is the topic link, there are also some instructions included:

    http://sensorstechforum.com/forums/malware-removal-questions-and-guides/how-to-remove-cryptowall-4-0-and-restore-your-data/

    Reply
  8. AvatarMarc

    Has anyone been able to decrypt CryptoWall 3.0 arquivos criptografados (2048 bits de criptografia) using this method?

    Reply
  9. AvatarYannick

    Olá,
    Ayant été infecté par l’un de ces virus, je me demande lequel car il a encrypté un grand nombre de fichiers en rajoutant une extension vvv à chaque fois, rendant celui-ci invisible et en mettant dans chaque sous-répertoire plusieurs fichiers appeléshow_recover” ? Donc quel virus est-ce et quelle méthode pour retrouver ses fichiers crypés s’il y en a ?
    muito obrigado.

    cordialmente
    Yannick

    Reply
    1. Milena DimitrovaMilena Dimitrova

      Hello Yannick,

      Infelizmente, you have been attacked by TeslaCrypt. More information about the ransomware here: http://sensorstechforum.com/remove-teslacrypt-and-restore-vvv-encrypted-files/.

      Reply
  10. AvatarYannick

    Olá,

    muito obrigado. Oui, donc il n’y a rien à faire pour récupérer ses fichiers….

    Reply
  11. AvatarCornel Goran

    Oi! I’ve also got some encrypted files that I’d like to decrypt. eu tenho 2 arquivos “5k5m3y.1mm” e “8co7o3co.ze4haand they look like this if I try to edit them with notepad: http://i.imgur.com/NIJozDk.png

    First thing first, how do I know what virus caused this?

    Reply
    1. AvatarVencislav Krustev

      Hello @Corel Goran
      Isto é típico para infecções ransomware como CTB Locker e CryptoWall 4.0. A fim para mim ser capaz de fornecê-lo adequadamente com a ajuda Eu gostaria que você me envie um recorte ou uma captura de tela de qualquer mensagem de resgate que você pode ver. Pode ser um arquivo .txt em seu desktop ou uma imagem, named like this, por exemplo:

      • Help_Decrypt_Your_Files
      • Help_Your_Files
      • HELP_DECRYPT

      Attach the screenshots in your reply to this topic in our forum so that our experts may be able to relevantly assist you the best way they can:

      Forum Topic To Attach Your Screenshot

      Reply
  12. AvatarCarsten

    Oi.
    Got the same problem since Thursday this week. Encrypted files have .micro extention. Kaspersky Rescue disc reported trojan-ransom.win32.bitman.fay to be the threat.
    Does the above described procedure work for .micro files as well?
    Many thanks for any help.

    Reply
    1. AvatarCarsten

      Addition:
      I have found some files in My Documents folder named recover_file_***random_text***.txt that seem to contain keys. May these possibly be the keys to be retrieved by using phyton as described above?

      Reply
  13. AvatarJoel

    As Carsten, I have same problem with “.micro” Arquivo.
    And as him, I have some file namedrecover_file….TXT”. Any idea about how to use them and if this solution works with .micro file?
    obrigado

    Reply
  14. AvatarMauzinh0

    Same problem with *.micro file
    Same recover…TXT
    Any news?
    Obrigado

    Reply
  15. Avatarnf

    Olá, I have also the problem with the *.micro extension.

    Reply
  16. AvatarWilliam

    Mis archivos han quedado encintados con extension .locky, que virus me ataco? y que guía para recuperarlos me recomiendan

    Atte
    William

    Reply
  17. Avatarstef

    Olá, j’ai bien les fichier HELP_FILE*.HTML et PNG
    Mes fichiers ont maintenant des noms et extensions aelatoires.
    Le nettoyage est fait sans probleme.
    Sur leur site où il faut payer, j’ai juste fait decryptage d’un fichier 512 ko max gratuitement, donc maintenant j’ai l’ancien fichier crypté 0sqn1xx.dh1w et le meme fichier decrypté : decrypted-file.jpg
    Ne serait-il pas possible d’apres ces 2 fichiers, d’en reconstruire la clef RSA ?? pour faire les tous les autres fichiers.
    muito obrigado, j’aime votre travail.
    Stef

    Reply
    1. AvatarBerta Bilbao (pós autor)

      Olá, this appears to be CryptoWall 4.0. It has a very strong encryption, so without the key it’s going to be very hard to decrypt your files. The two files don’t hold a decryption key in themselves, but might help a decryptor program to see a similarity in its database and find a password.

      Try Rakhni Decryptor pela Kaspersky – it’s a free tool and with the help of the two files it might find a key file on your computer if it’s not deleted. Além disso, take a look at the tips about CryptoWall 4.0 em nossos forums.

      Reply
  18. AvatarVinny

    Olá, I did the commands and I received the page footer errorthe file is encrypted with the “.locky” extensão. is there something i could do?

    Reply
  19. AvatarOswaldo Leonett

    Oi,
    Eu tenho o mesmo problema. My files are also infected by redshitline(em)india.com And the extension is xtbl- Can I use this python script to decrypt ? Are there other possible solutions ?

    Oswaldo

    Reply
  20. AvatarMarco

    Hy Berta,
    I infected a month ago by cryptowall 4.0, the same of Oswaldo Leonett and I should know how to doThe instructions in this article are valid also for cryptowall 4? If I run .py script I can hope to decrypt my files of the script operate up to version 3.0 of cryptowall?
    Are There some new information about Cryptowall 4?

    Reply
  21. AvatarMarco

    I correct myself, the contracted infection is the same of Stef with some HELP_FILE*.HTML and PNG.

    Reply
  22. AvatarKarl Kristian dall

    Alle dine filer er blevet krypteret med RSA – 2048 og EAS -128 . INFORMATION om SA kan ses på da.Wikipedia. org/wiki/RSA. OG da.Wikipedia. org/wiki/Advanced Encryption Standard
    Dekryptering til hemmelig server på links
    Hw5qrh6fxv2tnaqn.tor2web.org/17572E56401D80
    Jeg tør ikke klikke på dem, måske der er mere virus. De vil nok have betaling for at dekryptere, og få adgang til mit Dankort.

    Kan der gøres noget.
    På forhånd tak
    Mvh. Karl

    Reply
  23. AvatarKD Samir

    Olá
    Le pirate a tous les fichiers et encrypte m’a demandé de rançon
    Je n’ai pas l’argent.
    Pouvez-vous aider?
    Si oui j’envoyer des fichiers (originalcrypté) pour trouver le code.
    type de cryptage :
    CryptoLocker
    public key RSA-2048 generated

    Reply

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