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FeaturesCalc.py
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FeaturesCalc.py
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import os, statistics
from scapy.all import *
class FeaturesCalc():
malware_label = 1.0
legitimate_label = 0.0
def __init__(self, flow_type, min_window_size=2):
self.flow_type = flow_type
self.min_window_size = int(min_window_size)
assert self.flow_type == "malware" or self.flow_type == "legitimate", "Flow_type non valido. Valori validi sono malware o legitimate."
assert self.min_window_size > 0, "Valore non valido per min_windows_size. Deve essere maggiore di 0."
self.label = None
if(self.flow_type == "malware"):
self.label = self.malware_label
else:
self.label = self.legitimate_label
self.features_name = ["Avg_syn_flag", "Avg_urg_flag", "Avg_fin_flag", "Avg_ack_flag", "Avg_psh_flag", "Avg_rst_flag", "Avg_DNS_pkt", "Avg_TCP_pkt",
"Avg_UDP_pkt", "Avg_ICMP_pkt", "Duration_window_flow", "Avg_delta_time", "Min_delta_time", "Max_delta_time", "StDev_delta_time",
"Avg_pkts_lenght", "Min_pkts_lenght", "Max_pkts_lenght", "StDev_pkts_lenght", "Avg_small_payload_pkt", "Avg_payload", "Min_payload",
"Max_payload", "StDev_payload", "Avg_DNS_over_TCP", "Label"]
self.total_packets = 0
self.nb_samples = 0
def compute_features(self, packets_list):
def increment_sample_nb(nb):
self.nb_samples += nb
def update_received_pkts(nb):
self.total_packets += nb
def compute_avg(list_of_values):
if (len(list_of_values) == 0):
return 0.0
else:
return float(sum(list_of_values) / self.get_min_window_size())
def compute_min(list_of_values):
if (len(list_of_values) == 0):
return 0.0
else:
return float(min(list_of_values))
def compute_max(list_of_values):
if (len(list_of_values) == 0):
return 0.0
else:
return float(max(list_of_values))
def compute_stDev(list_of_values):
if (len(list_of_values) == 0 or len(list_of_values) == 1):
return 0.0
else:
try:
stat = statistics.stdev(list_of_values)
return float(stat)
except:
return 0.0
# Data una lista di pkts restituisce una lista della medesima grandezza con in prima posizione la ratio (DNS/Pkt5Layer)
# Se non ci sono pacchetti DNS o non ci sono pacchetti di livello 5 che non siano DNS, ritorna come primo elemento della lista 0
def DNS_over_TCP_ratio(packets_list):
total_DNS = float(sum(compute_DNS_packets(packets_list)))
ratio_list = []
total_packet_high_level_list = [] # lista di 1 e 0 dove 1 si ha se il pacchetto e' di liv 5 e 0 in tutti gli altri casi
list_of_pkt_with_TCP = compute_TCP_packets(packets_list) # Rispetto alla lista ho 1.0 dove c'e tcp e 0.0 dove non c'e
list_of_paylod_lenght = compute_packet_TCP_payload_size(packets_list, count_packet_without_payload=True) # Rispetto alla lista ho len(payload) dove c'e tcp con carico, 0.0 dove c'e tcp senza carico, e None dove non c'e tcp
# Calcolo quanti paccehtti di liv 5 ho nella finestra che non sia DNS
if (len(packets_list) == len(list_of_pkt_with_TCP) and len(packets_list) == len(list_of_paylod_lenght)):
for i in range(0, len(packets_list) - 1):
# Controllo se il Pkt ha TCP
if (list_of_pkt_with_TCP[i] == 1.0):
# Controllo se il pkt ha un payload in quanto vuol dire che e' di liv 5
if (list_of_paylod_lenght[i] > 0):
# Verifico che il pkt che ha il tcp con un payload, non sia DNS
if (not packets_list[i].haslayer("DNS")):
total_packet_high_level_list.append(1.0)
else:
total_packet_high_level_list.append(0.0)
# Il pkt non ha payload
else:
total_packet_high_level_list.append(0.0)
# Il pkt non ha tcp
else:
total_packet_high_level_list.append(0.0)
else:
print("Errore imprevisto in dnsOverTCPRatio()")
total_packet_high_level = float(sum(total_packet_high_level_list))
if (total_packet_high_level != 0):
ratio_list.append(float(total_DNS / total_packet_high_level))
else:
ratio_list.append(0.0)
i = 1
# aggiungo tanti 0 quanto da 1 a len(pktList) - 1
while (i <= len(packets_list) - 1):
ratio_list.append(0.0)
i += 1
return ratio_list
#Calcola la durata del flusso di pacchetti.
def compute_duration_flow(packets_list):
return packets_list[len(packets_list) - 1].time - packets_list[0].time
# Calcola la grandezza in byte di ogni pacchetto in una lista di pacchetti
def packets_bytes_lenght(packets_list):
pkt_lenght_list = []
for pkt in packets_list:
pkt_lenght_list.append(float(len(pkt)))
return pkt_lenght_list
# Calcola il numero di pacchetti DNS
def compute_DNS_packets(packets_list):
dns_counter = []
for pkt in packets_list:
if (pkt.haslayer("DNS")):
dns_counter.append(1.0)
else:
dns_counter.append(0.0)
return dns_counter
# Calcola il numero di pacchetti TCP
def compute_TCP_packets(packets_list):
tcp_counter = []
for pkt in packets_list:
if (pkt.haslayer("TCP")):
tcp_counter.append(1.0)
else:
tcp_counter.append(0.0)
return tcp_counter
# Calcola il numero di pacchetti UDP
def compute_UDP_packets(ackets_list):
udp_counter = []
for pkt in packets_list:
if (pkt.haslayer("UDP")):
udp_counter.append(1.0)
else:
udp_counter.append(0.0)
return udp_counter
# Calcola il numero di pacchetti ICMP,
def compute_ICMP_packets(packets_list):
icmp_counter = []
for pkt in packets_list:
if (pkt.haslayer("ICMP") is True):
icmp_counter.append(1.0)
else:
icmp_counter.append(0.0)
return icmp_counter
# Conta il numero di pacchetti con il layer tcp che hanno payload piccolo o assente
def compute_packet_with_small_TCP_payload(packets_list, count_packet_without_payload=False):
packets_small_payload_count = []
pktPayloadList = compute_packet_TCP_payload_size(packets_list, count_packet_without_payload=count_packet_without_payload)
for payload in pktPayloadList:
if (payload <= 32): # 32 e' stato scelto in base al framework bonesi che simula una botnet e imposta di default il paylaod pare a 32
packets_small_payload_count.append(1.0)
elif (payload > 32):
packets_small_payload_count.append(0.0)
elif (payload == None):
# Se ha il layer tcp e non rispetta i canoni aumenta il contatore. Se non ha il layer tcp non incrementa il contatore.
# Quindi anche se una finestra e' di 10 pkt, si pesera' questo parametro rispetto il numeri di pkt che hanno il layer TCP
if (count_packet_without_payload):
packets_small_payload_count.append(0.0)
else:
pass
return packets_small_payload_count
# Calcola la dimensione del payload di un pacchetto TCP
def compute_packet_TCP_payload_size(packets_list, count_packet_without_payload=False):
payload_size_list = []
for pkt in packets_list:
if (pkt.haslayer("TCP")):
if (pkt["TCP"].payload == None): # Il pacchetto e' TCP ma non ha payload. Probabilemente e' un three way
payload_size_list.append(0.0)
else:
payload_size_list.append(float(len(pkt["TCP"].payload)))
else:
if (count_packet_without_payload):
payload_size_list.append(None)
else:
pass
return payload_size_list
def compute_delta_time(packets_list):
i = 1
delta_time_list = []
while (i <= (len(packets_list) - 1)):
delta_time_list.append(packets_list[i].time - packets_list[i - 1].time)
i += 1
return delta_time_list
# Calcola i flags TCP attivi in un pacchetto. L'array contiene 1 se il flag
# e' attivo, 0 se non lo e' o il pkt non e' TCP
def compute_tcp_flags(packets_list):
syn_counter = []
fin_counter = []
ack_counter = []
psh_counter = []
urg_counter = []
rst_counter = []
FIN = 0x01
SYN = 0x02
RST = 0x04
PSH = 0x08
ACK = 0x10
URG = 0x20
for pkt in packets_list:
if (pkt.haslayer("TCP")):
F = pkt["TCP"].flags
if F & FIN:
fin_counter.append(1.0)
syn_counter.append(0.0)
ack_counter.append(0.0)
psh_counter.append(0.0)
urg_counter.append(0.0)
rst_counter.append(0.0)
elif F & SYN:
fin_counter.append(0.0)
syn_counter.append(1.0)
ack_counter.append(0.0)
psh_counter.append(0.0)
urg_counter.append(0.0)
rst_counter.append(0.0)
elif F & RST:
fin_counter.append(0.0)
syn_counter.append(0.0)
ack_counter.append(0.0)
psh_counter.append(0.0)
urg_counter.append(0.0)
rst_counter.append(1.0)
elif F & PSH:
fin_counter.append(0.0)
syn_counter.append(0.0)
ack_counter.append(0.0)
psh_counter.append(1.0)
urg_counter.append(0.0)
rst_counter.append(0.0)
elif F & ACK:
fin_counter.append(0.0)
syn_counter.append(0.0)
ack_counter.append(1.0)
psh_counter.append(0.0)
urg_counter.append(0.0)
rst_counter.append(0.0)
elif F & URG:
fin_counter.append(0.0)
syn_counter.append(0.0)
ack_counter.append(0.0)
psh_counter.append(0.0)
urg_counter.append(1.0)
rst_counter.append(0.0)
else:
pass
else:
fin_counter.append(0.0)
syn_counter.append(0.0)
ack_counter.append(0.0)
psh_counter.append(0.0)
urg_counter.append(0.0)
rst_counter.append(0.0)
return (syn_counter, fin_counter, ack_counter, psh_counter, urg_counter, rst_counter)
if(len(packets_list) < self.get_min_window_size()):
print("\nNumero di paccheti troppo basso\n")
return None
else:
syn_lst, fin_lst, ack_lst, psh_lst, urg_lst, rst_lst = compute_tcp_flags(packets_list)
syn_avg = compute_avg(syn_lst)
fin_avg = compute_avg(fin_lst)
ack_avg = compute_avg(ack_lst)
psh_avg = compute_avg(psh_lst)
urg_avg = compute_avg(urg_lst)
rst_avg = compute_avg(rst_lst)
durationFlow = compute_duration_flow(packets_list)
avgTimeFlow = compute_avg(compute_delta_time(packets_list))
minTimeFlow = compute_min(compute_delta_time(packets_list))
maxTimeFlow = compute_max(compute_delta_time(packets_list))
stdevTimeFlow = compute_stDev(compute_delta_time(packets_list))
dns_pkt = compute_avg(compute_DNS_packets(packets_list))
tcp_pkt = compute_avg(compute_TCP_packets(packets_list))
udp_pkt = compute_avg(compute_UDP_packets(packets_list))
icmp_pkt = compute_avg(compute_ICMP_packets(packets_list))
pktLenghtAvg = compute_avg(packets_bytes_lenght(packets_list))
pktLenghtMin = compute_min(packets_bytes_lenght(packets_list))
pktLenghtMax = compute_max(packets_bytes_lenght(packets_list))
pktLenghtStDev = compute_stDev(packets_bytes_lenght(packets_list))
smallPktPayloadAvg = compute_avg(compute_packet_with_small_TCP_payload(packets_list, False))
avgPayload = compute_avg(compute_packet_TCP_payload_size(packets_list, False))
minPayload = compute_min(compute_packet_TCP_payload_size(packets_list, False))
maxPayload = compute_max(compute_packet_TCP_payload_size(packets_list, False))
stDevPayload = compute_stDev(compute_packet_TCP_payload_size(packets_list, False))
dnsOverTcpRatioNormalized = compute_avg(DNS_over_TCP_ratio(packets_list))
row = [syn_avg, urg_avg, fin_avg, ack_avg, psh_avg, rst_avg, dns_pkt, tcp_pkt, udp_pkt, icmp_pkt, durationFlow, avgTimeFlow,
minTimeFlow, maxTimeFlow, stdevTimeFlow, pktLenghtAvg, pktLenghtMin, pktLenghtMax, pktLenghtStDev, smallPktPayloadAvg,
avgPayload, minPayload, maxPayload, stDevPayload, dnsOverTcpRatioNormalized, self.label]
increment_sample_nb(1)
update_received_pkts(len(packets_list))
return row
def get_total_pkts(self):
return self.total_packets
def get_total_sample(self):
return self.nb_samples
def reset_sample_counter(self):
self.nb_samples = 0
def reset_total_pkts_counter(self):
self.total_packets = 0
def set_min_window_size(self, val):
self.min_window_size = val
def get_min_window_size(self):
return self.min_window_size
def set_flow_type(self, flow_type):
assert self.flow_type == "malware" or self.flow_type == "legitimate", "Flow_type non valido. Valori validi sono malware o legitimate."
self.flow_type = flow_type
if(self.flow_type == "malware"):
self.label = self.malware_label
else:
self.label = self.legitimate_label
def get_flow_type(self):
return self.flow_type
def get_features_name(self):
return self.features_name