Wireshark tricks

Improve your Wireshark skills

Tutorials

The following tutorials are amazing to learn some cool basic tricks:

• https://unit42.paloaltonetworks.com/unit42-customizing-wireshark-changing-column-display/

• https://unit42.paloaltonetworks.com/using-wireshark-display-filter-expressions/

• https://unit42.paloaltonetworks.com/using-wireshark-identifying-hosts-and-users/

• https://unit42.paloaltonetworks.com/using-wireshark-exporting-objects-from-a-pcap/

Filters

Here you can find wireshark filter depending on the protocol: https://www.wireshark.org/docs/dfref/ Other interesting filters:

• (http.request or ssl.handshake.type == 1) and !(udp.port eq 1900)

  • HTTP and initial HTTPS traffic

• (http.request or ssl.handshake.type == 1 or tcp.flags eq 0x0002) and !(udp.port eq 1900)

  • HTTP and initial HTTPS traffic + TCP SYN

• (http.request or ssl.handshake.type == 1 or tcp.flags eq 0x0002 or dns) and !(udp.port eq 1900)

  • HTTP and initial HTTPS traffic + TCP SYN + DNS requests

Search

If you want to search for content inside the packets of the sessions press CTRL+f You can add new layers to the main information bar (No., Time, Source...) pressing right bottom and Edit Column

Practice: https://www.malware-traffic-analysis.net/

Identifying Domains

You can add a column that show the Host HTTP header:

And a column that add the Server name from an initiating HTTPS connection (ssl.handshake.type == 1):

Identifying local hostnames

From DHCP

In current Wireshark instead of bootp you need to search for DHCP

From NBNS

Decrypting TLS

Decrypting https traffic with server private key

edit>preference>protocol>ssl>

Press Edit and add all the data of the server and the private key (IP, Port, Protocol, Key file and password)

Decrypting https traffic with symmetric session keys

It turns out that Firefox and Chrome both support logging the symmetric session key used to encrypt TLS traffic to a file. You can then point Wireshark at said file and presto! decrypted TLS traffic. More in: https://redflagsecurity.net/2019/03/10/decrypting-tls-wireshark/ To detect this search inside the environment for to variable SSLKEYLOGFILE

A file of shared keys will looks like this:

To import this in wireshark go to edit>preference>protocol>ssl> and import it in (Pre)-Master-Secret log filename:

ADB communication

Extract an APK from an ADB communication where the APK was sent:

from scapy.all import *

pcap = rdpcap("final2.pcapng")

def rm_data(data):
    splitted = data.split(b"DATA")
    if len(splitted) == 1:
        return data
    else:
        return splitted[0]+splitted[1][4:]

all_bytes = b""
for pkt in pcap:
    if Raw in pkt:
        a = pkt[Raw]
        if b"WRTE" == bytes(a)[:4]:
            all_bytes += rm_data(bytes(a)[24:])
        else:
            all_bytes += rm_data(bytes(a))
print(all_bytes)

f = open('all_bytes.data', 'w+b')
f.write(all_bytes)
f.close()