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Wifi Pcap Analysis ​

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Check BSSIDs ​

When you receive a capture whose principal traffic is Wifi using WireShark you can start investigating all the SSIDs of the capture with Wireless --> WLAN Traffic:

Brute Force ​

One of the columns of that screen indicates if any authentication was found inside the pcap. If that is the case you can try to Brute force it using aircrack-ng:

bash
aircrack-ng -w pwds-file.txt -b <BSSID> file.pcap

For example it will retrieve the WPA passphrase protecting a PSK (pre shared-key), that will be required to decrypt the trafic later.

Data in Beacons / Side Channel ​

If you suspect that data is being leaked inside beacons of a Wifi network you can check the beacons of the network using a filter like the following one: wlan contains <NAMEofNETWORK>, or wlan.ssid == "NAMEofNETWORK" search inside the filtered packets for suspicious strings.

Find Unknown MAC Addresses in A Wifi Network ​

The following link will be useful to find the machines sending data inside a Wifi Network:

  • ((wlan.ta == e8:de:27:16:70:c9) && !(wlan.fc == 0x8000)) && !(wlan.fc.type_subtype == 0x0005) && !(wlan.fc.type_subtype ==0x0004) && !(wlan.addr==ff:ff:ff:ff:ff:ff) && wlan.fc.type==2

If you already know MAC addresses you can remove them from the output adding checks like this one: && !(wlan.addr==5c:51:88:31:a0:3b)

Once you have detected unknown MAC addresses communicating inside the network you can use filters like the following one: wlan.addr==<MAC address> && (ftp || http || ssh || telnet) to filter its traffic. Note that ftp/http/ssh/telnet filters are useful if you have decrypted the traffic.

Decrypt Traffic ​

Edit --> Preferences --> Protocols --> IEEE 802.11--> Edit

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