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Pcap_Features_Extraction

This program allow you to extract some features from pcap files.

Folders

You have to put some pcaps in respective folders.

Features Calculation

FeaturesCalc.py file contains the code to calculate the features. This program is thinked for two type of pcaps: Malware Pcaps and Legitimate Pcaps. There are 26 features:

  • Avg_syn_flag: The average of packets with syn flag active in a window of packtes.
  • Avg_urg_flag
  • Avg_fin_flag
  • Avg_ack_flag
  • Avg_psh_flag
  • Avg_rst_flag
  • Avg_DNS_pkt: The average pf DNS packets in a window of packets.
  • Avg_TCP_pkt
  • Avg_UDP_pkt
  • Avg_ICMP_pkt
  • Duration_window_flow: The time from the first packet to last packet in a window of packets.
  • Avg_delta_time: The average of delta times in a window of packets. Delta time is the time from a packet to the next packet.
  • Min_delta_time: The minimum delta time in a window of packets.
  • Max_delta_time: The maximum delta time in a window of packets.
  • StDev_delta_time: The Standard Deviation of delta time in a window of packets.
  • Avg_pkts_lenght: The average of packet leghts in a window of packet.
  • Min_pkts_lenght
  • Max_pkts_lenght
  • StDev_pkts_lenght
  • Avg_small_payload_pkt: The average of packet with a small payload. A payload is considered small if his size is lower than 32 Byte.
  • Avg_payload: The average of payload size in a window of packets.
  • Min_payload
  • Max_payload
  • StDev_payload
  • Avg_DNS_over_TCP: The average of ration DNS/TCP in a window of packets.
  • Label: 0|1 respectively if pcap is legitimate or malware.

CSV

The features are saved in a csv file.

Example

csv = CSV(file_name="features")
csv.create_empty_csv()
#Here i add the header of csv file.
csv.add_row(featuresCalc.get_features_name())
#Here i add a generic row.
features = featuresCalc.compute_features(array_of_pkts)
csv.add_row(features)

Attacker Calculation

AttackerCalc.py file computes an attacker from a malware pcap. The first ip in a malware pcap is probably the attacker because it starts the communication flow.

Packet Filter

PacketFilter.py file filters a packet.

Example

attacker = AttackerCalc(pcap=pcap)
ip_to_consider = attacker.compute_attacker()
ip_to_ignore = ["127.0.0.1"]

filter_1 = PacketFilter(ip_whitelist_filter=ip_to_consider, ip_blacklist_filter=[], TCP=True)

This filter accepts all the packets with ip: ip_to_consider which have TCP layer.

filter_2 = PacketFilter(ip_whitelist_filter=[], ip_blacklist_filter=ip_to_ignore, UDP=True)

This filter accepts all the packets which haven't ip: ip_to_ignore with UDP layer.

filter_3 = PacketFilter(ip_whitelist_filter=[], ip_blacklist_filter=[], IPv4=True)

This filter accepts all packets with IP layer. You can use these filters in the following way:

filter_1 = PacketFilter(ip_whitelist_filter=[], ip_blacklist_filter=[], TCP=True, UDP=False)
filter_2 = PacketFilter(ip_whitelist_filter=[], ip_blacklist_filter=[], TCP=False, UDP=True)
if ((filter_2.check_packet_filter(pkt) or filter_1.check_packet_filter(pkt)) is True):
    print("pkt accepted")

This code accepts a packet if it has a TCP Layer or UDP Layer.

Example Of Usage

In Main.py file there is an example of usage of this program. You can run it with:

python3 Main.py

This file creates a single csv every run. So if you put 4 pcaps in a generic folder (or in both folders), the Main.py file creates a single csv with features of 4 (or 8) pcaps.