atomic-red-team/atomics/T1486/T1486.yaml

attack_technique: T1486
display_name: Data Encrypted for Impact
atomic_tests:
- name: Encrypt files using gpg (FreeBSD/Linux)
  auto_generated_guid: 7b8ce084-3922-4618-8d22-95f996173765
  description: |
    Uses gpg to encrypt a file
  supported_platforms:
  - linux
  input_arguments:
    pwd_for_encrypted_file:
      description: the password that you want for the encrypted file
      type: string
      default: passwd
    encrypted_file_path:
      description: path to the encrypted file
      type: path
      default: /tmp/passwd.gpg
    input_file_path:
      description: path to the file that you want to encrypt
      type: path
      default: /etc/passwd
    encryption_alg:
      description: encryption algorithm of the file
      type: string
      default: AES-256
  dependency_executor_name: bash
  dependencies:
  - description: |
      Finds where gpg is located
    prereq_command: |
      which_gpg=`which gpg`
    get_prereq_command: |
      (which pkg && pkg install -y gnupg)||(which yum && yum -y install epel-release gpg)||(which apt-get && DEBIAN_FRONTEND=noninteractive apt-get install -y gpg)
  executor:
    name: sh
    elevation_required: false
    command: |
      echo "#{pwd_for_encrypted_file}" | $which_gpg --batch --yes --passphrase-fd 0 --cipher-algo #{encryption_alg} -o #{encrypted_file_path} -c #{input_file_path}
    cleanup_command: |
      rm #{encrypted_file_path}

- name: Encrypt files using 7z (FreeBSD/Linux)
  auto_generated_guid: 53e6735a-4727-44cc-b35b-237682a151ad
  description: |
    Uses 7z to encrypt a file
  supported_platforms:
  - linux
  input_arguments:
    pwd_for_encrypted_file:
      description: the password that you want for the encrypted file
      type: string
      default: passwd
    encrypted_file_path:
      description: path to the encrypted file
      type: path
      default: /tmp/passwd.zip
    input_file_path:
      description: path to the file that you want to encrypt
      type: path
      default: /etc/passwd
  dependency_executor_name: bash
  dependencies:
  - description: |
      Finds where 7z is located
    prereq_command: |
      which_7z=`which 7z`
    get_prereq_command: |
      (which pkg && pkg install -y 7-zip)
  executor:
    name: sh
    elevation_required: false
    command: |
      $which_7z a -p#{pwd_for_encrypted_file} #{encrypted_file_path} #{input_file_path}
    cleanup_command: |
      $which_7z e #{encrypted_file_path}
      rm #{encrypted_file_path}

- name: Encrypt files using ccrypt (FreeBSD/Linux)
  auto_generated_guid: 08cbf59f-85da-4369-a5f4-049cffd7709f
  description: |
    Attempts to encrypt data on target systems as root to simulate an interruption authentication to target system. If root permissions are not available then attempts to encrypt data within user's home directory.
  supported_platforms:
  - linux
  input_arguments:
    cped_file_path:
      description: Path where you want your copied file to be
      type: path
      default: /tmp/passwd
    root_input_file_path:
      description: Path the target file to be encrypted. File will be copied to /tmp/ before encrypting
      type: path
      default: /etc/passwd
    pwd_for_encrypted_file:
      description: Password to use for encryption
      type: string
      default: passwd
  dependency_executor_name: sh
  dependencies:
  - description: |
      Finds where ccencrypt and ccdecrypt are located
    prereq_command: |
      which_ccencrypt=`which ccencrypt`
      which_ccdecrypt=`which ccdecrypt`
    get_prereq_command: |
      (which pkg && pkg install -y ccript)||(which yum && yum -y install epel-release ccrypt)||(which apt-get && DEBIAN_FRONTEND=noninteractive apt-get install -y ccrypt)
  executor:
    name: sh
    elevation_required: false
    command: |
      which_ccencrypt=`which ccencrypt`
      cp #{root_input_file_path} #{cped_file_path};
      $which_ccencrypt -T -K #{pwd_for_encrypted_file} #{cped_file_path}
    cleanup_command: |
      rm #{cped_file_path}.cpt

- name: Encrypt files using openssl (FreeBSD/Linux)
  auto_generated_guid: 142752dc-ca71-443b-9359-cf6f497315f1
  description: |
    Uses openssl to encrypt a file
  supported_platforms:
  - linux
  input_arguments:
    private_key_path:
      description: path to the private key
      type: path
      default: /tmp/key.pem
    public_key_path:
      description: path to the public key
      type: path
      default: /tmp/pub.pem
    encryption_bit_size:
      description: size of the bit of encryption
      type: integer
      default: 2048
    encrypted_file_path:
      description: path to the encrypted file
      type: path
      default: /tmp/passwd.zip
    input_file_path:
      description: path to the file that you want to encrypt
      type: path
      default: /etc/passwd
  dependency_executor_name: bash
  dependencies:
  - description: |
      Finds where openssl is located
    prereq_command: |
      which_openssl=`which openssl`
    get_prereq_command: |
  executor:
    name: sh
    elevation_required: false
    command: |
      which_openssl=`which openssl`
      $which_openssl genrsa -out #{private_key_path} #{encryption_bit_size}
      $which_openssl rsa -in #{private_key_path} -pubout -out #{public_key_path}
      $which_openssl rsautl -encrypt -inkey #{public_key_path} -pubin -in #{input_file_path} -out #{encrypted_file_path}
    cleanup_command: |
      $which_openssl rsautl -decrypt -inkey #{private_key_path} -in #{encrypted_file_path}
      rm #{encrypted_file_path}

- name: PureLocker Ransom Note
  auto_generated_guid: 649349c7-9abf-493b-a7a2-b1aa4d141528
  description: |
    building the IOC (YOUR_FILES.txt) for the PureLocker ransomware 
    https://www.bleepingcomputer.com/news/security/purelocker-ransomware-can-lock-files-on-windows-linux-and-macos/

  supported_platforms:
  - windows

  executor:
    name: command_prompt
    elevation_required: true
    command: |
      echo T1486 - Purelocker Ransom Note > %USERPROFILE%\Desktop\YOUR_FILES.txt
    cleanup_command: |
      del %USERPROFILE%\Desktop\YOUR_FILES.txt >nul 2>&1

- name: Encrypt files using 7z utility - macOS
  auto_generated_guid: 645f0f5a-ef09-48d8-b9bc-f0e24c642d72
  description: |
    This test encrypts the file(s) using the 7z utility
  supported_platforms:
  - macos
  dependency_executor_name: sh
  dependencies:
  - description: |
      Check if 7z command exists on the machine
    prereq_command: |
      which 7z
    get_prereq_command: |
      echo Installing 7z, using brew
      /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
      brew install p7zip
  input_arguments:
    file_password:
      description: Password to be provided for archiving the file
      type: string
      default: ARTPass
    encrypted_file_name:
      description: Name of the archive to be created
      type: string
      default: ARTArchive.7z
    input_file_path:
      description: Path to the file that you want to encrypt
      type: path
      default: ~/test.txt
  executor:
    command: |
      7z a -p #{file_password} -mhe=on #{encrypted_file_name} #{input_file_path}
    cleanup_command: |
      rm #{encrypted_file_name}
    name: sh
    elevation_required: false  
    
- name: Encrypt files using openssl utility - macOS
  auto_generated_guid: 1a01f6b8-b1e8-418e-bbe3-78a6f822759e
  description: |
    This test encrypts the file(s) using the openssl utility
  supported_platforms:
  - macos
  input_arguments:
    encryption_option:
      description: Specifiy the required encryption option
      type: string
      default: -pbkdf2  
    input_file_path:
      description: Path to the file that you want to encrypt
      type: path
      default: ~/test.txt
    output_file_name:
      description: Path to the file that you want to encrypt
      type: string
      default: ARTFile      
  executor:
    command: |
      openssl enc #{encryption_option} -in #{input_file_path} -out #{output_file_name}
    cleanup_command: |
      rm #{output_file_name}
    name: sh
    elevation_required: false     

- name: Data Encrypted with GPG4Win
  auto_generated_guid: 4541e2c2-33c8-44b1-be79-9161440f1718
  description:
      Gpg4win is a Windows tool (also called Kleopatra which is the preferred certificate manager) that uses email and file encryption packages for symmetric encryption. 
      It is used by attackers to encrypt disks. User will need to add pass phrase to encrypt file as automation is not allowed under newer versions.
  supported_platforms:
    - windows
  input_arguments:
    GPG_Exe_Location:
      description: Path of the GPG program
      type: path
      default: 'C:\Program Files (x86)\GnuPG\bin\gpg.exe'
    File_to_Encrypt_Location:
      description: Path of File
      type: path
      default: '$env:temp\test.txt'
  dependencies:
  - description: |
      GPG must exist at (#{GPG_Exe_Location}). If -GetPrereqs fails, try to install GPG4WIN manually at 'https://www.gpg4win.org/download.html'. Once done, run -CheckPrereqs to confirm that it works.
    prereq_command: |
      if (test-path '#{GPG_Exe_Location}'){exit 0} else {exit 1}
    get_prereq_command: |
      Set-Content -Path "#{File_to_Encrypt_Location}" -Value "populating this file with some text"  # Create the test.txt file
      New-Item -Type Directory "PathToAtomicsFolder\..\ExternalPayloads\" -ErrorAction Ignore -Force | Out-Null
      invoke-webrequest "https://files.gpg4win.org/gpg4win-4.1.0.exe" -outfile "PathToAtomicsFolder\..\ExternalPayloads\gpginstall.exe"
      cmd /c "PathToAtomicsFolder\..\ExternalPayloads\gpginstall.exe" /S
  executor:
    name: powershell
    elevation_required: false
    command: |
      Set-Content -Path "#{File_to_Encrypt_Location}" -Value "populating this file with some text"  # Create the test.txt file again in case prereqs failed
      cmd /c "`"C:\Program Files (x86)\GnuPG\bin\gpg.exe`" --passphrase 'SomeParaphraseBlah' --batch --yes -c `"#{File_to_Encrypt_Location}`""
    cleanup_command: |
      Remove-Item -Path "#{File_to_Encrypt_Location}" -Force -ErrorAction SilentlyContinue
      Remove-Item -Path "#{File_to_Encrypt_Location}.gpg" -Force -ErrorAction SilentlyContinue

- name: Data Encrypt Using DiskCryptor
  auto_generated_guid: 44b68e11-9da2-4d45-a0d9-893dabd60f30
  description: |
      DiskCryptor, an open source encryption utility, can be exploited by adversaries for encrypting all disk partitions, including system partitions. This tool was identified in a ransomware campaign, as reported on https://thedfirreport.com/2021/11/15/exchange-exploit-leads-to-domain-wide-ransomware/. The documentation for DiskCryptor can be found at https://github.com/DavidXanatos/DiskCryptor. During the installation process, running dcrypt.exe starts the encryption console. It's important to note that a system reboot is necessary as part of the installation.
  supported_platforms:
    - windows
  input_arguments:
      dcrypt_exe:
        description: The dcrypt.exe executable from dcrypt_setup.exe
        type: path
        default: 'dcrypt.exe'
  dependency_executor_name: powershell
  dependencies:
  - description: |
      dcrypt_setup will be installed at specified location (#{dcrypt_exe})
    prereq_command: |
      if (Test-Path "${env:ProgramFiles}/dcrypt/#{dcrypt_exe}") {exit 0} else {exit 1}
    get_prereq_command: |
      Write-Host Downloading DiskCryptor installer
      New-Item -Type Directory "PathToAtomicsFolder\..\ExternalPayloads\" -ErrorAction Ignore -Force | Out-Null
      Invoke-WebRequest "https://github.com/DavidXanatos/DiskCryptor/releases/download/1.1.846.118/dcrypt_setup_1.1.846.118.exe" -OutFile      "PathToAtomicsFolder\..\ExternalPayloads\dcrypt_setup_1.1.846.118.exe"
      Write-Host Install DiskCryptor
      Start-Process "PathToAtomicsFolder\..\ExternalPayloads\dcrypt_setup_1.1.846.118.exe" -Wait -ArgumentList "/s"
  executor:
    name: command_prompt
    elevation_required: true
    command: |
      ""%PROGRAMFILES%\dcrypt"\#{dcrypt_exe}"

- name: Akira Ransomware drop Files with .akira Extension and Ransomnote
  auto_generated_guid: ab3f793f-2dcc-4da5-9c71-34988307263f
  description: |
    Dropping 100 files with random content and .akira File Extension and the Akira Ransomnote to c:\
  supported_platforms:
  - windows
  executor:
    name: powershell
    elevation_required: true
    command: |
      1..100 | ForEach-Object { $out = new-object byte[] 1073741; (new-object Random).NextBytes($out); [IO.File]::WriteAllBytes("c:\test.$_.akira", $out) }
      echo "Hi friends" >> $env:Userprofile\Desktop\akira_readme.txt
      echo "" >> $env:Userprofile\Desktop\akira_readme.txt
      echo "Whatever who you are and what your title is if you' re reading this it means the internal infrastructure of your company is fully or partially dead, all your backups - virtual, physical - everything that we managed to reach - are completely removed. Moreover, we have taken a great amount of your corporate data prior to encryption  Well, for now let's keep all the tears and resentment to ourselves and try to build a constructive dialogue. We're fully aware of what damage we caused by locking your internal sources. At the moment. you have to know: " >> $env:Userprofile\Desktop\akira_readme.txt
      echo "1. Dealing with us you will save A LOT due to we are not interested in ruining your financially. We will study in depth your finance, bank income statements, your savings, investments etc. and present our reasonable demand to you. If you have an active cyber insurance, let us know and we will guide you how to properly use it. Also, dragging out the negotiation process will lead to failing of a deal" >> $env:Userprofile\Desktop\akira_readme.txt
      echo "2. Paying us you save your TIME, MONEY, EFFORTS and be back on track within 24 hours approximately. Our decryptor works properly on any files or systems, so you will be able to check it by requesting a test decryption service from the beginning of our conversation. [f you decide to recover on your own, keep in mind that you can permanently lose access to some files or accidently corrupt them — in this case we won't be able to help.  " >> $env:Userprofile\Desktop\akira_readme.txt
      echo "3. The security report or the exclusive first-hand information that you will receive upon reaching an agreement is of a great value, since NO full audit of your network will show you the vulnerabilities that we' ve managed to detect and used in order to get into. identify backup solutions and upload your data." >> $env:Userprofile\Desktop\akira_readme.txt
      echo "4. As for your data, if we fail to agree, we will try to sell personal information/trade secrets/databases/source codes — generally speaking, everything that has a value on the darkmarket - to multiple threat actors at ones." >> $env:Userprofile\Desktop\akira_readme.txt
      echo "Then all of this will be published in our blog -" >> $env:Userprofile\Desktop\akira_readme.txt
      echo "" >> $env:Userprofile\Desktop\akira_readme.txt
      echo "https://akira.onion" >> $env:Userprofile\Desktop\akira_readme.txt
      echo "" >> $env:Userprofile\Desktop\akira_readme.txt
      echo "5. We're more than negotiable and will definitely find the way to settle this quickly and reach an agreement which will satisfy both of us" >> $env:Userprofile\Desktop\akira_readme.txt
      echo "" >> $env:Userprofile\Desktop\akira_readme.txt
      echo "If you' re indeed interested in our assistance and the services we provide you can reach out to us following simple instructions:" >> $env:Userprofile\Desktop\akira_readme.txt
      echo "" >> $env:Userprofile\Desktop\akira_readme.txt
      echo "1. Install TOR Browser to get access to our chat room - https://www.torproject.org/download/." >> $env:Userprofile\Desktop\akira_readme.txt
      echo "2. Paste this link - https://akira.onion" >> $env:Userprofile\Desktop\akira_readme.txt
      echo "3. Use this code - - to log into our chat." >> $env:Userprofile\Desktop\akira_readme.txt
      echo "" >> $env:Userprofile\Desktop\akira_readme.txt
      echo "Keep in mind that the faster you will get in touch, the less damage we cause" >> $env:Userprofile\Desktop\akira_readme.txt
    cleanup_command: |
      del $env:Userprofile\Desktop\akira_readme.txt 
      del c:\test.*.akira