Mobile devices today boast computing power comparable to desktop computers, opening up the possibility of performing complex network analysis directly from a smartphone screen. Using a terminal emulator Termux When combined with auditing tools, it allows system administrators and information security specialists to test the resilience of wireless networks to external influences without the need to carry bulky equipment. However, it's important to understand that the app itself is merely a shell providing access to the Android-based Linux operating system.
To implement the functions often attributed to so-called "hackers," simply installing the program is not enough; hardware support for monitoring mode in the device's Wi-Fi adapter is critical. Without the ability to switch the network card to monitoring mode monitor mode Most advanced packet capture techniques become impossible, leaving the user with only basic scanning capabilities. This is why professionals always start by checking the compatibility of their equipment before running any scripts.
In this article, we'll cover the technical aspects of working with network utilities in the Termux environment, walk through the process of installing the necessary repositories, and focus on methods for protecting your infrastructure from such checks. Successful capture of a WPA/WPA2 handshake is only possible if there is an active client connecting to the network at the time of scanning. Understanding these mechanisms is necessary not so much for attack, but for the competent development of a defensive strategy and the selection of strong passwords.
⚠️ Warning: All actions described in this article should be performed exclusively for testing your own networks or networks for which you have written permission from the owner. Unauthorized access to other people's wireless networks is a violation of the law.
Installing and Initially Setting Up Termux
Getting started requires installing the latest version of the app, preferably from the F-Droid repository, as the version on Google Play may be outdated and lack support for the necessary file system features. After launching, you need to update packages and install basic utilities, which will form the foundation for further work with network protocols. The standard set of commands includes updating repository lists and installing the necessary dependencies.
pkg update && pkg upgradepkg install root-repo
pkg install git python python2
The environment configuration process may take some time depending on your internet connection speed and mobile processor performance. It's important to ensure a stable network connection during this process to avoid errors downloading the binaries. Once the basic installation is complete, you can begin cloning the specialized repositories.
There are several approaches to organizing your workspace in the terminal, and the choice depends on the specific needs of the user. Some prefer a minimalist set of utilities, while others download full-fledged distributions. In any case, knowledge of basic Linux file system navigation commands is a must.
Required tools and repositories
Conducting a full-fledged security audit requires a set of specialized tools that are not included in the standard Android distribution. The primary source of such utilities is often a repository. Hacker-Tools-Termux or official Kali Linux packages adapted for the mobile platform. Installation is done via the package manager. pkg or apt.
Among the most popular utilities are port scanners, traffic analyzers, and vulnerability testing tools. Each solves a specific problem in the security chain. Below is a list of key tools that are often used in combination:
- 📡 Nmap — a powerful network scanner that detects active devices, open ports, and versions of running services.
- 🔓 Hydra — a tool for conducting brute-force attacks on various authorization protocols.
- 📦 Wireshark (or tshark) is a traffic analyzer that is needed for a deep study of data packets passing through the network.
- 📶 Aircrack-ng — a set of utilities for auditing the security of wireless networks, including monitoring and testing.
Installing each component requires careful reading of the output messages, as some utilities may require additional libraries or superuser privileges. Installation errors are often related to missing permissions or processor architecture incompatibility. Therefore, it is recommended to check root access status before running complex scripts.
It's important to note that having the right tools installed doesn't guarantee successful operations without understanding their operating principles. Blindly using commands can lead to false conclusions about the network's security status. Therefore, studying the documentation for each utility is an essential part of the training process.
Working with network interfaces and monitoring mode
A key aspect of WiFi analysis is the network adapter's ability to operate in monitor mode, which allows it to capture all packets in the air, not just those addressed to a specific device. In the Android environment, implementing this functionality is complicated by driver and kernel limitations. The command ifconfig or more modern ip link.
Setting the interface to the desired mode typically requires root access and chipset support for the appropriate commands. The standard sequence of actions involves stopping the process occupying the interface and changing its operating mode. An example command for setting the interface to monitor mode might look like this:
ifconfig wlan0 downiwconfig wlan0 mode monitor
ifconfig wlan0 up
However, on many devices without an external USB WiFi card with a chip Atheros or Realtek These commands may not work. Internal smartphone modules often lack this functionality at the driver level. In such cases, specialists resort to using external adapters connected via an OTG cable.
⚠️ Note: Command interfaces and supported operating modes depend on the specific WiFi module model and Android kernel version. Always check the specifications of your device on the manufacturer's website.
If the card fails to enter monitoring mode, its functionality will be limited to passive channel scanning and packet header analysis available in normal mode. This still allows for valuable information about the environment, but does not allow for intrusion into the data stream. To check for mode support, use the command iw list.
Why does the phone's internal card rarely support monitoring?
Smartphone manufacturers optimize drivers for power saving and stable connections by disabling low-level features that are not needed by the average user.
Traffic analysis and vulnerability scanning
After setting up the interface, the data collection phase begins, which forms the foundation for any further analysis. Network scanning allows you to identify all connected devices, determine their IP addresses, and determine their manufacturer's MAC addresses. The utility Nmap, which provides a detailed report on the status of ports.
The scanning command can be adapted to various tasks: a quick availability check or a deep service analysis. For example, scanning a subnet for open ports is performed by specifying an address range. The scan results help create a network map and identify potential entry points.
| Team | Description of action | Noise level |
|---|---|---|
nmap -sP 192.168.1.0/24 |
Ping all hosts in a subnet (silent scan) | Short |
nmap -sV -p- target_ip |
Full port scan with version detection | High |
nmap -O target_ip |
Determining the operating system of a remote host | Average |
netdiscover -r 192.168.1.0/24 |
Active host discovery via ARP requests | Average |
Analyzing the obtained information requires careful attention, as many devices can mask open ports or employ obfuscation techniques. Discovering an unusually open port may indicate a vulnerability or a misconfigured service. Security specialists always check the obtained data against known vulnerability databases.
In addition to active scanning, passive analysis is also used, which doesn't send packets into the network but merely listens to the air. This allows for the detection of devices hidden from active scanning by firewalls. This approach is more time-consuming but ensures a high degree of stealth.
Testing password strength and encryption
One of the most common tasks is to test the complexity of passwords used to protect wireless networks and services within them. This is accomplished through instrumented attacks and brute-force attacks, such as Hydra or built-in modules Aircrack-ngThe principle of their operation is based on an automated authorization attempt using a list of known passwords.
The WiFi security testing process often involves attempting to capture the handshake between the client and the access point. The resulting hash is then subjected to offline brute-force testing. The speed of this process directly depends on the processor power and the complexity of the chosen password. Modern encryption standards WPA3 make the task much more difficult for attackers compared to the outdated one WEP.
- 🔑 Dictionary attacks — using databases of popular passwords and their variations.
- 🔢 Mask overkill — generating combinations according to given rules (for example, 8 digits).
- ⚡ Rainbow table attacks - using pre-computed hashes to speed up the process.
It's important to understand that protection against such attacks lies not in the complexity of the encryption algorithm, which is quite secure in the WPA2/WPA3 standards, but in the length and entropy of the password. Short passwords consisting of dictionary words can be cracked in minutes, even on a mobile device. Therefore, using long passphrases made of random characters is the gold standard.
⚠️ Warning: Long-term password cracking operations place a high load on the processor and may cause the smartphone to overheat. Monitor the device's temperature during tests.
Measures to protect home and corporate networks
Understanding attack methods allows you to develop an effective defense strategy. The first and most important step is to stop using factory-default passwords and network names (SSIDs). Standard names often indicate the router model, making it easier to identify vulnerabilities specific to a particular manufacturer.
Enabling encryption WPA3If your equipment supports this standard, it provides additional security even when using simple passwords thanks to the SAE (Simultaneous Authentication of Equals) mechanism. If you use WPA2, keep your router firmware up to date, as manufacturers regularly patch security holes.
☑️ WiFi Security Audit
It's also recommended to segment the network, separating guest access for visitors and IoT devices, which often have weak built-in security. This will prevent an attacker from accessing primary computers and data storage via a vulnerable smart light bulb. Configuring VLANs at the corporate level is a mandatory requirement.
Regularly monitoring the list of connected clients will help prevent unwanted connections. Many modern routers allow notifications of new connections. If you notice an unknown device, you should immediately change the access key and check the security logs.
Frequently Asked Questions (FAQ)
Is it possible to hack WiFi using Termux without root access?
Without root access, Termux's functionality is severely limited. You can only use tools that don't require direct, low-level access to the network interface, such as certain types of scanning or social engineering. Superuser access is required for packet sniffing and changing the card's operating mode.
What is the best external adapter for Android?
The most compatible adapters are those based on the Atheros AR9271, Ralink RT3070, and Realtek RTL8812AU chips. Before purchasing, be sure to check forums for drivers specifically for your Android version and kernel.
Is it safe to install scripts from GitHub in Termux?
Running unknown scripts is strictly not recommended. The code may contain malicious payloads that steal data or turn the device into part of a botnet. Always analyze the script's contents before running it.
Why doesn't Aircrack-ng detect my WiFi card?
Most likely, your device doesn't support monitoring mode at the driver level, or the card hasn't been manually configured for this mode. The problem could also be a lack of root privileges, which are necessary to access the hardware.