hacktricks/forensics/pcaps-analysis/wifi-pcap-analysis.md

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# Wifi Pcap Analysis
## 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_:
![](../../.gitbook/assets/image%20%28426%29.png)
![](../../.gitbook/assets/image%20%28429%29.png)
### 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
```
## 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 Wiffi 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 --&gt; Preferences --&gt; Protocols --&gt; IEEE 802.11--&gt; Edit
![](../../.gitbook/assets/image%20%28427%29.png)