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Have you ever wondered how your laptop or mobile phone knows which wireless networks are available nearby? It is actually straightforward. Wireless Access Points continually send beacon frames to all nearby wireless devices; these frames include information about the access point, such as the SSID (name), type of encryption, MAC address, etc.
In this tutorial, you will learn how to send beacon frames into the air using the Scapy library in Python to forge fake access points successfully!
Necessary packages to install for this tutorial:
$ pip3 install faker scapy
It is highly suggested that you follow along with the Kali Linux environment, as it provides the pre-installed utilities we need in this tutorial.
Before we dive into the exciting code, you need to enable monitor mode in your network interface card:
$ apt-get install aircrack-ng
Note: The aircrack-ng utility comes pre-installed with Kali Linux, so you shouldn't run this command if you're on Kali.
root@rockikz:~# airmon-ng check kill Killing these processes: PID Name 735 wpa_supplicant
root@rockikz:~# airmon-ng start wlan0 PHY Interface Driver Chipset phy0 wlan0 ath9k_htc Atheros Communications, Inc. TP-Link TL-WN821N v3 / TL-WN822N v2 802.11n [Atheros AR7010+AR9287] (mac80211 monitor mode vif enabled for [phy0]wlan0 on [phy0]wlan0mon) (mac80211 station mode vif disabled for [phy0]wlan0)
Note: My USB WLAN stick is named wlan0 in my case, you should run the ifconfig command and see your proper network interface name.
Alright, now you have everything set, let's start with a simple recipe first:
from scapy.all import * # interface to use to send beacon frames, must be in monitor mode iface = "wlan0mon" # generate a random MAC address (built-in in scapy) sender_mac = RandMAC() # SSID (name of access point) ssid = "Test" # 802.11 frame dot11 = Dot11(type=0, subtype=8, addr1="ff:ff:ff:ff:ff:ff", addr2=sender_mac, addr3=sender_mac) # beacon layer beacon = Dot11Beacon() # putting ssid in the frame essid = Dot11Elt(ID="SSID", info=ssid, len=len(ssid)) # stack all the layers and add a RadioTap frame = RadioTap()/dot11/beacon/essid # send the frame in layer 2 every 100 milliseconds forever # using the `iface` interface sendp(frame, inter=0.1, iface=iface, loop=1)
The above code does the following:
We generate a random MAC address, set the name of the access point we want to create, and then create an 802.11 frame. The fields are:
So we should use the same MAC address of addr2 and addr3 because the sender is the access point!
We create our beacon frame with SSID Infos, then stack them all together and send them using Scapy's sendp() function.
After we set up our interface into monitor mode and execute the script, we should see something like that in the list of available Wi-Fi access points:
Now let's get a little bit fancier and create many fake access points at the same time:
from scapy.all import * from threading import Thread from faker import Faker def send_beacon(ssid, mac, infinite=True): dot11 = Dot11(type=0, subtype=8, addr1="ff:ff:ff:ff:ff:ff", addr2=mac, addr3=mac) # ESS+privacy to appear as secured on some devices beacon = Dot11Beacon(cap="ESS+privacy") essid = Dot11Elt(ID="SSID", info=ssid, len=len(ssid)) frame = RadioTap()/dot11/beacon/essid sendp(frame, inter=0.1, loop=1, iface=iface, verbose=0) if __name__ == "__main__": # number of access points n_ap = 5 iface = "wlan0mon" # generate random SSIDs and MACs faker = Faker() ssids_macs = [ (faker.name(), faker.mac_address()) for i in range(n_ap) ] for ssid, mac in ssids_macs: Thread(target=send_beacon, args=(ssid, mac)).start()
All I did here was wrap the previous lines of code in a function, generate random MAC addresses and SSIDs using the faker package, and then start a separate thread for each access point. Once you execute the script, the interface will send five beacons each 100 milliseconds (at least in theory). This will result in appearing of five fake access points. Check this out:
Here is how it looks on Android OS:
If you're unsure how to use threads, check this tutorial.
That is amazing. Note that connecting to one of these access points will fail, as they are not real access points, just an illusion!
Alright, that's it, Happy Crafting ♥
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