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Network Traffic Analysis
Network Traffic Analysis
Basic PCAP File Parsing
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require 'packetfu'
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packets = PacketFu::PcapFile.read_packets 'packets.pcap'
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Find FTP Credentials
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#!/usr/bin/env ruby
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require 'packetfu'
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​
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pcap_file = ARGV[0]
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packets = PacketFu::PcapFile.read_packets pcap_file
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​
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packets.each_with_index do |packet, i|
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if packet.tcp_dport == 21
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if packet.payload.match(/(USER|PASS)/)
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src = [packet.ip_src].pack('N').unpack('C4').join('.')
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dst = [packet.ip_dst].pack('N').unpack('C4').join('.')
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puts "#{src} => #{dst}"
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print packet.payload
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end
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end
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end
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Returns
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192.168.2.127 => 192.168.2.128
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USER ayoi
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192.168.2.127 => 192.168.2.128
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PASS kambingakuilang
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Capturing and building PCAP file
Sometime we don't have the time or option to install external libraries on our environment. Let's work capture all packets on all interfaces then see how to build a pcap file to write in it.
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#!/usr/bin/env ruby
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#
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# KING SABRI | @KINGSABRI
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#
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require 'socket'
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​
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class Pcap
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​
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def initialize(pcap_file)
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@pcap_file = open(pcap_file, 'wb')
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# Pcap Global https://wiki.wireshark.org/Development/LibpcapFileFormat#Global_Header
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global_header = [
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0xa1b2c3d4, # magic_number: used to identify pcap files
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2, # version_major
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4, # version_minor
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0, # thiszone
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0, # sigfigs
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65535, # snaplen
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1 # network (link-layer), 1 for Ethernet
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].pack('ISSIIII')
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@pcap_file.write global_header
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end
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​
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def write(data)
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time_stamp = Time.now.to_f.round(2).to_s.split('.').map(&:to_i)
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data_length = data.length
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# Pcap Record (Packet) Header: https://wiki.wireshark.org/Development/LibpcapFileFormat#Record_.28Packet.29_Header
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packet_header = [
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time_stamp[0], # ts_sec timestamp seconds
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time_stamp[1], # ts_usec timestamp microseconds
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data_length, # incl_len the number of bytes of packet data actually captured
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data_length # orig_len the length of the packet as it appeared on the network when it was captured
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].pack('IIII')
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record = "#{packet_header}#{data}"
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@pcap_file.write(record)
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rescue
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@pcap_file.close
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end
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end
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​
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pcap = Pcap.new(ARGV[0])
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socket = Socket.new(Socket::PF_PACKET, Socket::SOCK_RAW, 0x03_00)
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loop do
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raw_data = socket.recvfrom(65535)[0]
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pcap.write raw_data
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end
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<!--
!/usr/bin/env ruby
#
require 'packetfu'
require 'pp'
capture = PacketFu::Capture.new :iface => 'mon0', :promisc => true, :start => true
capture.stream.each do |p|
pkt = PacketFu::Packet.parse p
pp pkt
end
\
array 56
include PacketFu
packets = PcapFile.file_to_array '/home/KING/wireless.pcap'
packets.eachwith_index do |packet , ref|
puts "" 75
puts "Reference: #{ref}"
puts "\" _ 75
pkt = Packet.parse(packet)
puts pkt.dissect
sleep 2
end
\
packets = PcapFile.read_packets '/home/KING/wireless.pcap'
packet = packets[56]
pkt = Packet.parse(packet)
puts pkt.inspect_hex
=begin
1876
1551
1550
1339
1324
459
458
=end
--->
Last modified 3yr ago