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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_: ![](<../../../.gitbook/assets/image (424).png>) ![](<../../../.gitbook/assets/image (425).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 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 `, 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== && (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 ![](<../../../.gitbook/assets/image (426).png>)
Support HackTricks and get benefits! - Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)! - Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family) - Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com) - **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.** - **Share your hacking tricks by submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**