Class: SphinxWindowsSysmonEventFilter

Inherits:
SphinxWindowsEventFilter show all
Defined in:
lib/logstash/filters/sphinx.rb

Constant Summary collapse

SPHINX_FILTER_VERSION = 
1
SPHINX_FILTER_NAME = 
'SysmonEventFilter'

Instance Method Summary collapse

Methods inherited from SphinxEventFilter

#finalize, #initialize

Constructor Details

This class inherits a constructor from SphinxEventFilter

Instance Method Details

#add_file_name(event) ⇒ Object 



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# File 'lib/logstash/filters/sphinx.rb', line 589

def add_file_name(event)

  image = event['ImageLoaded']
  file_name = File.basename(image.gsub("\\","/"))
  event['FileName'] = file_name

  nil
end

#add_process_name(event) ⇒ Object 



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# File 'lib/logstash/filters/sphinx.rb', line 598

def add_process_name(event)

  image = event['Image']
  process_name = File.basename(image.gsub("\\","/"))
  event['ProcessName'] = process_name

  nil
end

#add_reputation_data(event) ⇒ Object 



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# File 'lib/logstash/filters/sphinx.rb', line 607

def add_reputation_data(event)

  # downcase hash

  md5 = get_downcase_hash(event)
  return nil if (md5.nil? || (md5.strip == ""))

  event['Hash'] = md5

  data = @data_accessor.get_record(md5)


  if data

    event['reputation'] = data['reputation']
    event['source'] = data['source']
    event['reputation_timestamp'] = data["reputation_timestamp"]
    event['vt_score'] = data["vt_score"]
    event['vt_total'] = data["vt_total"]
    event['vt_sub_score'] = data["vt_sub_score"]
    event['vt_scan_date'] = data["vt_scan_date"]
    event['has_vulnerability'] = data["has_vulnerability"]
    event['has_verified_signature'] = data["has_verified_signature"]
    event['signing_vendor'] = data["signing_vendor"]

  end

  nil
end

#add_target_file_name(event) ⇒ Object 



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# File 'lib/logstash/filters/sphinx.rb', line 580

def add_target_file_name(event)

  image = event['TargetFilename']
  file_name = File.basename(image.gsub("\\","/"))
  event['FileName'] = file_name

  nil
end

#apply(event) ⇒ Object 



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# File 'lib/logstash/filters/sphinx.rb', line 470

def apply(event)


  case event['EventID'].to_i

    # process creation

    when 1
      set_document_id(event)
      set_document_type(event, SphinxEventType::PROCESS_CREATION)
      add_process_name(event)
      add_reputation_data(event)


    # file creation

    when 2
      set_document_type(event, SphinxEventType::FILE_CREATION_TIME_CHANGE)
      set_document_parent(event)
      add_process_name(event)
      add_target_file_name(event)
      add_reputation_data(event)

    # network conn

    when 3
      set_document_type(event, SphinxEventType::NETWORK_CONNECTION)
      set_document_parent(event)
      extend_ipaddress(event)
      add_process_name(event)

    # process termination

    when 5
      set_document_type(event, SphinxEventType::PROCESS_TERMINATION)
      set_document_parent(event)

    # driver load

    when 6
      set_document_type(event, SphinxEventType::DRIVER_LOAD)
      set_document_parent(event)
      add_file_name(event)
      add_reputation_data(event)


    # dll load

    when 7
      set_document_type(event, SphinxEventType::IMAGE_LOAD)        
      set_document_parent(event)
      add_process_name(event)
      add_file_name(event)
      add_reputation_data(event)

    # remote thread

    when 8
      set_document_type(event, SphinxEventType::REMOTE_THREAD_CREATION)
      set_document_parent(event)
      #TODO


  end

  nil

end

#extend_ipaddress(event) ⇒ Object 



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# File 'lib/logstash/filters/sphinx.rb', line 543

def extend_ipaddress(event)

  # src ip

  begin
    ip_str = event['SourceIp']
    ip_addr = IPAddress(ip_str)

    if ip_addr.ipv6?
      event['SourceIpv6'] = ip_addr.address
    else
      event['SourceIpv4'] = ip_addr.address
    end

  rescue => e
    puts e.message
  end

  # dst ip

  begin
    ip_str = event['DestinationIp']
    ip_addr = IPAddress(ip_str)

    if ip_addr.ipv6?
      event['DestinationIpv6'] = ip_addr.address
    else
      event['DestinationIpv4'] = ip_addr.address
    end

  rescue => e
    puts e.message
  end


end

#get_downcase_hash(event) ⇒ Object 



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# File 'lib/logstash/filters/sphinx.rb', line 636

def get_downcase_hash(event)

  if event['Hash']
    return event['Hash'].downcase

  elsif event['Hashes']
    return event['Hashes'][4,32].downcase #NOTE  hardcoded for MD5

  end

  nil
end

#set_document_id(event) ⇒ Object 



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# File 'lib/logstash/filters/sphinx.rb', line 531

def set_document_id(event)
  event['_id'] = event['ProcessGuid']
end

#set_document_parent(event) ⇒ Object 



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# File 'lib/logstash/filters/sphinx.rb', line 539

def set_document_parent(event)
  event['parent'] = event['ProcessGuid']
end

#set_document_type(event, type) ⇒ Object 



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# File 'lib/logstash/filters/sphinx.rb', line 535

def set_document_type(event, type)
  event['type'] = type
end