Sandeep Tech

TECH TUTORIALS

Learn ethical hacking, mobile security, and tech tutorials across different platforms

Termux

June 15, 2025 5 min read

Getting Started with Termux

Learn how to install and set up Termux on your Android device for ethical hacking.

Sandeep Tech

June 15, 2025

Termux

June 10, 2025 8 min read

Essential Termux Packages

Discover the must-have packages for security testing in Termux and how to install them.

Sandeep Tech

June 10, 2025

Security

June 5, 2025 10 min read

Network Scanning with Termux

Learn to perform network reconnaissance using tools like Nmap directly from your Android device.

Sandeep Tech

June 5, 2025

Android

May 28, 2025 7 min read

Android App Analysis

Understand how to analyze Android applications for security vulnerabilities using Termux.

Sandeep Tech

May 28, 2025

Security

May 20, 2025 12 min read

Securing Your Android Device

Learn how to secure your Android device against common threats and vulnerabilities.

Sandeep Tech

May 20, 2025

Termux

May 15, 2025 9 min read

Password Cracking on Android

Explore password cracking techniques using tools like John the Ripper in Termux.

Sandeep Tech

May 15, 2025

Windows

May 10, 2025 11 min read

Windows Security Hardening

Learn essential techniques to secure your Windows system against cyber threats.

Sandeep Tech

May 10, 2025

Games

May 5, 2025 13 min read

Ethical Game Hacking

Discover how to find security vulnerabilities in games and report them responsibly.

Sandeep Tech

May 5, 2025

Apple

April 28, 2025 10 min read

iOS Security Fundamentals

Understanding the security architecture of iOS and how to protect your Apple devices.

Sandeep Tech

April 28, 2025

TERMUX TOOLS

Essential tools for ethical hacking on Android devices

Nmap

Network scanning and security auditing tool for Android

Learn More

Aircrack-ng

Wireless network security assessment tool for Termux

Learn More

Metasploit

Penetration testing framework for Android devices

Learn More

Sqlmap

Automatic SQL injection tool for Android web testing

Learn More

Wireshark

Network protocol analyzer for Android traffic capture

Learn More

John the Ripper

Password cracking tool optimized for Android devices

Learn More

TERMUX CHALLENGES

Test your skills with Android and Termux security challenges

Termux Setup Basics

Easy

Learn to install and configure Termux with essential packages for security testing.

50 Points

342 Solves

Start Challenge

Android App Analysis

Easy

Analyze an Android application to find hardcoded credentials and security flaws.

75 Points

287 Solves

Start Challenge

Network Scanning

Medium

Use Nmap in Termux to scan a network and identify vulnerable services.

100 Points

156 Solves

Start Challenge

Permission Bypass

Medium

Identify and exploit Android permission vulnerabilities in a sample application.

125 Points

98 Solves

Start Challenge

Termux Tool Installation

Easy

Install and configure security tools in Termux from source and package repositories.

60 Points

223 Solves

Start Challenge

Android Forensics

Hard

Extract and analyze data from an Android device image to find hidden information.

200 Points

67 Solves

Start Challenge

FREQUENTLY ASKED QUESTIONS

Answers to common questions about Termux and mobile security

What is Termux and how does it work?

Termux is a terminal emulator and Linux environment for Android. It doesn't require rooting your device and provides a powerful command-line interface with package management capabilities.

Is Termux safe to use on my device?

Yes, Termux is safe when downloaded from official sources like F-Droid. It runs in a sandboxed environment and doesn't have access to system files unless you explicitly grant storage permissions.

Can I perform real security testing with Termux?

Absolutely! Termux supports many powerful security tools like Nmap, Metasploit, Wireshark, and more. While it has some limitations compared to a full Linux system, it's capable of performing most security testing tasks.

Do I need to root my Android device to use Termux?

No, Termux works perfectly on non-rooted devices. However, some advanced tools and operations might require root access for full functionality.

WHAT OUR USERS SAY

Feedback from the Termux community

"Sandeep Tech helped me transition from desktop to mobile security testing. The tutorials are clear and the challenges are perfect for learning."

Alex Johnson

Cybersecurity Student

"I've learned more about mobile security in a month with Sandeep Tech than I did in a year of self-study. The community is incredibly supportive."

Maria Garcia

Penetration Tester

"The Termux challenges are well-designed and progressively challenging. They've significantly improved my command-line skills."

David Chen

Security Researcher

TERMUX COMMUNITY

Connect with other Termux users and Android security enthusiasts

Termux Setup Basics

Back to Challenges

Challenge Description

This challenge will guide you through the basic setup of Termux on your Android device. Termux is a powerful terminal emulator and Linux environment for Android that allows you to run various security tools directly on your phone.

What is Termux?

Termux is an Android terminal emulator and Linux environment application that works directly with no rooting or setup required. A minimal base system is automatically installed, and additional packages are available using the package manager.

Learning Objectives

Install Termux from F-Droid or official sources
Update and upgrade packages
Install essential security tools
Set up storage access
Understand basic Termux commands

Your Task

Follow the simulated Termux terminal below to complete the setup process. Enter the correct commands in the order they appear to successfully set up Termux for security testing.

Termux Terminal Simulator

termux@localhost:~$ pkg update

termux@localhost:~$ pkg upgrade

termux@localhost:~$ pkg install python

termux@localhost:~$ pkg install git

termux@localhost:~$ pkg install nmap

termux@localhost:~$ termux-setup-storage

termux@localhost:~$ ls -la

Submit Flag

Once you've completed all the setup commands, you'll receive the flag. Enter it below to complete the challenge.

Need a Hint?

Follow the commands in order: pkg update, pkg upgrade, pkg install python, pkg install git, pkg install nmap, termux-setup-storage, ls -la

Android App Analysis

Back to Challenges

Challenge Description

This challenge focuses on analyzing Android applications to find security vulnerabilities and hardcoded credentials. You'll learn how to decompile APK files and examine their source code for potential security issues.

What is Android App Analysis?

Android app analysis involves examining Android application packages (APKs) to understand their functionality, identify security vulnerabilities, and extract sensitive information. This is a crucial skill for mobile security professionals.

Learning Objectives

Understand APK file structure
Learn to decompile Android applications
Identify hardcoded credentials
Find insecure data storage
Understand Android manifest vulnerabilities

Your Task

Analyze the sample Android application information below to find the hardcoded API key and flag. The application has poor security practices that you need to identify.

Sample Application: SecureChat v1.0

This is a supposedly secure chat application that stores user data and communicates with a backend server. However, the developers made several security mistakes.

Package Name

com.example.securechat

Version

1.0 (release)

Min SDK

21 (Android 5.0)

Target SDK

33 (Android 13)

Android Permissions

INTERNET

Granted

READ_EXTERNAL_STORAGE

Granted

WRITE_EXTERNAL_STORAGE

Granted

ACCESS_FINE_LOCATION

Granted

Decompiled Code Snippet

// NetworkUtils.java

public class NetworkUtils {

private static final String API_BASE_URL = "https://api.securechat.example.com";

private static final String API_KEY = "FLAG{HARDCODED_API_KEY_FOUND}";

public static String sendRequest(String endpoint) {

// Implementation details...

}

Submit Flag

Enter the flag you found in the decompiled code to complete the challenge.

Need a Hint?

Look for hardcoded strings in the NetworkUtils class. The flag is stored as the API_KEY value.

Network Scanning

Back to Challenges

Challenge Description

This challenge teaches you how to use Nmap in Termux to scan networks and identify vulnerable services. Network scanning is a fundamental skill for security professionals to discover hosts and services on a computer network.

What is Network Scanning?

Network scanning is the process of identifying active hosts, open ports, and services running on a network. Nmap is a powerful tool that can be used to perform various types of scans to gather information about network devices.

Learning Objectives

Understand basic Nmap commands
Learn to identify open ports and services
Recognize potential vulnerabilities
Interpret Nmap scan results
Use Nmap options effectively

Your Task

Analyze the simulated Nmap scan results below to identify the vulnerable service and extract the flag. The scan was performed on a target network to discover open services.

Nmap Scan Results

# nmap -sV -p 1-100 192.168.1.100

Starting Nmap 7.80 ( https://nmap.org )
Nmap scan report for 192.168.1.100
Host is up (0.021s latency).
Not shown: 98 closed ports
PORT STATE SERVICE VERSION
21/tcp open ftp vsftpd 3.0.3
22/tcp open ssh OpenSSH 8.2p1 Ubuntu 4ubuntu0.1
80/tcp open http Apache httpd 2.4.41 ((Ubuntu))
139/tcp open netbios-ssn Samba smbd 3.6.9
445/tcp open netbios-ssn Samba smbd 3.6.9
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 7.31 seconds

Vulnerability Information

# searchsploit samba 3.6.9

------------------------------------------------------------------------------------------------------------------

Exploit Title | Path

------------------------------------------------------------------------------------------------------------------

Samba 3.0.20 - 3.0.25rc3 - Username Handling Remote Code Execution (Metasploit) | unix/remote/16320.rb

Samba 3.0.21 < 3.0.24 - 'lsa_io_trans_names' Heap Overflow (Metasploit) | unix/remote/10059.rb

Samba 3.0.24 - 'lsa_io_trans_names' Heap Overflow (Metasploit) | unix/remote/10060.rb

Samba 3.0.10 - 3.3.5 - 'lsa_remote' Memory Corruption (Metasploit) | unix/remote/10058.rb

Samba 3.0.20 < 3.0.25rc3 - 'trans2open' Remote Overflow (Metasploit) | unix/remote/9945.rb

Samba 3.0.21 - 3.0.24 - 'lsa_io_trans_names' Heap Overflow (Metasploit) | unix/remote/10059.rb

Samba 3.0.24 - 'lsa_io_trans_names' Heap Overflow (Metasploit) | unix/remote/10060.rb

Samba 3.0.10 - 3.3.5 - 'lsa_remote' Memory Corruption (Metasploit) | unix/remote/10058.rb

Samba 3.0.20 < 3.0.25rc3 - 'trans2open' Remote Overflow (Metasploit) | unix/remote/9945.rb

Samba 3.6.9 - IsKnownDword Unicode Buffer Overflow (Metasploit) | unix/remote/10061.rb

------------------------------------------------------------------------------------------------------------------

Shellcodes: No Results

------------------------------------------------------------------------------------------------------------------

Submit Flag

Based on the Nmap scan results and vulnerability information, identify the vulnerable service and submit the flag.

Need a Hint?

Look for services with known vulnerabilities. The flag is FLAG{SAMBA_VULNERABILITY_DETECTED}

Permission Bypass

Back to Challenges

Challenge Description

This challenge focuses on identifying and exploiting Android permission vulnerabilities. Android permissions control what an app can and cannot do, but sometimes these permissions can be bypassed or misused.

What are Android Permissions?

Android permissions are used to protect access to sensitive data and restricted functionality. Apps must request permission from the user to access certain features or data. However, improper implementation can lead to security vulnerabilities.

Learning Objectives

Understand Android permission system
Identify permission declaration in manifest
Recognize permission bypass techniques
Understand insecure permission implementation
Learn to exploit permission vulnerabilities

Your Task

Analyze the Android application code below to identify the permission vulnerability and extract the flag. The application has a custom permission implementation that can be bypassed.

Vulnerable Application: SecureNotes v2.0

This application claims to securely store user notes, but has a critical permission vulnerability that allows unauthorized access to protected data.

Package Name

com.example.securenotes

Version

2.0 (release)

Min SDK

24 (Android 7.0)

Target SDK

33 (Android 13)

Android Permissions

READ_EXTERNAL_STORAGE

Granted

WRITE_EXTERNAL_STORAGE

Granted

com.example.securenotes.PERMISSION_ACCESS_NOTES

Denied

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.example.securenotes">

<permission

android:name="com.example.securenotes.PERMISSION_ACCESS_NOTES"

android:protectionLevel="signature" />

<application

android:allowBackup="true"

android:icon="@mipmap/ic_launcher"

android:label="@string/app_name"

android:roundIcon="@mipmap/ic_launcher_round"

android:supportsRtl="true"

android:theme="@style/Theme.SecureNotes">

<intent-filter>

</intent-filter>

</activity>

<provider

android:name=".NotesProvider"

android:authorities="com.example.securenotes.provider"

android:exported="true"

android:readPermission="com.example.securenotes.PERMISSION_ACCESS_NOTES"

android:writePermission="com.example.securenotes.PERMISSION_ACCESS_NOTES" />

</application>

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

</manifest>

NotesProvider.java

public class NotesProvider extends ContentProvider {

private static final String AUTHORITY = "com.example.securenotes.provider";

private static final String NOTES_TABLE = "notes";

@Override

public Cursor query(Uri uri, String[] projection, String selection,

String[] selectionArgs, String sortOrder) {

// Check permission

if (getContext().checkCallingPermission("com.example.securenotes.PERMISSION_ACCESS_NOTES") != PackageManager.PERMISSION_GRANTED) {

// VULNERABILITY: No proper permission check implementation

// Flag is stored in the notes database

String flag = "FLAG{PERMISSION_BYPASS_SUCCESS}";

SQLiteDatabase db = dbHelper.getReadableDatabase();

Cursor cursor = db.query(NOTES_TABLE, projection, selection, selectionArgs, null, null, sortOrder);

return cursor;

}

// Other methods...

}

Submit Flag

Based on the code analysis, identify the permission vulnerability and submit the flag.

Need a Hint?

The permission check is incomplete. The flag is FLAG{PERMISSION_BYPASS_SUCCESS}

Termux Tool Installation

Back to Challenges

Challenge Description

This challenge teaches you how to install security tools in Termux from various sources. Termux uses the pkg package manager, but sometimes you need to install tools from source or third-party repositories.

What is Tool Installation in Termux?

Termux provides a package manager called pkg that allows you to install thousands of pre-compiled packages. However, some security tools may need to be installed from source or from third-party repositories.

Learning Objectives

Understand Termux package management
Learn to install from official repositories
Install tools from third-party repositories
Compile tools from source
Troubleshoot installation issues

Your Task

Follow the steps below to install various security tools in Termux. Enter the correct commands in the simulated terminal to complete the installation process.

Installation Steps

Update package lists

First, update the package lists to ensure you have the latest package information.

pkg update

Install Python

Python is required for many security tools. Install it using the package manager.

pkg install python

Install Git

Git is needed to clone repositories from GitHub.

pkg install git

Install Nmap

Nmap is a network scanning tool. Install it from the official repository.

pkg install nmap

Install Metasploit Framework

Metasploit is a powerful penetration testing framework. Install it from the community repository.

pkg install unstable-repo

pkg install metasploit

Termux Terminal Simulator

Submit Flag

Once you've completed all the installation steps, you'll receive the flag. Enter it below to complete the challenge.

Need a Hint?

Follow the installation steps in order: pkg update, pkg install python, pkg install git, pkg install nmap, pkg install unstable-repo, pkg install metasploit

Android Forensics

Back to Challenges

Challenge Description

This challenge introduces you to Android forensics, the process of extracting and analyzing data from Android devices. Mobile forensics is crucial for investigating security incidents and recovering evidence.

What is Android Forensics?

Android forensics involves extracting and analyzing data from Android devices to uncover evidence of criminal activity, security breaches, or other incidents. This includes examining file systems, application data, and system logs.

Learning Objectives

Understand Android file system structure
Learn to extract application data
Analyze SQLite databases
Examine system logs
Recover deleted files

Your Task

Analyze the simulated Android device data below to find hidden information and extract the flag. The data includes application databases, system logs, and file system information.

Device Information

Device Model

Google Pixel 6

Android Version

13 (API 33)

Root Status

Not Rooted

Application Data

Package: com.example.messenger

Application: Secure Messenger

Version: 3.2.1

Data Directory: /data/data/com.example.messenger

SQLite Database (messages.db)

$ sqlite3 messages.db

SQLite version 3.32.1 2020-05-25 16:19:56

Enter ".help" for usage hints.

sqlite> .tables

messages users conversations

sqlite> SELECT * FROM users;

1|admin|[email protected]|FLAG{FORENSICS_DATA_FOUND}

2|user1|[email protected]|password123

3|user2|[email protected]|password456

sqlite> .exit

System Logs

logcat

06-15 10:30:45.123 D/Messenger(12345): User login successful: admin

06-15 10:31:22.456 D/Messenger(12345): Encrypted message sent to user1

06-15 10:32:15.789 D/Messenger(12345): Flag stored in database: FLAG{FORENSICS_DATA_FOUND}

06-15 10:33:42.012 D/Messenger(12345): User logout: admin

File System

/data/data/com.example.messenger/files/

config.txt - Application configuration file

cache/ - Application cache directory

shared_prefs/ - Shared preferences directory

Submit Flag

Based on the forensic analysis, submit the flag you found in the data.

Need a Hint?

Look for the flag in the SQLite database and system logs. The flag is FLAG{FORENSICS_DATA_FOUND}

Search Topics

INTERACTIVE TERMINAL

TECH TUTORIALS

Getting Started with Termux

Essential Termux Packages

Network Scanning with Termux

Android App Analysis

Securing Your Android Device

Password Cracking on Android

Windows Security Hardening

Ethical Game Hacking

iOS Security Fundamentals

TERMUX TOOLS

Nmap

Aircrack-ng

Metasploit

Sqlmap

Wireshark

John the Ripper

DOWNLOAD TOOLS

Termux APK

Tool Collection

Scripts Repository

Documentation

LEARNING RESOURCES

eBooks

Video Tutorials

Certifications

Tool Documentation

TERMUX CHALLENGES

FREQUENTLY ASKED QUESTIONS

What is Termux and how does it work?

Is Termux safe to use on my device?

Can I perform real security testing with Termux?

Do I need to root my Android device to use Termux?

WHAT OUR USERS SAY

Alex Johnson

Maria Garcia

David Chen

TERMUX COMMUNITY

ETHICAL GUIDELINES

IMPORTANT LEGAL AND ETHICAL CONSIDERATIONS

SUBSCRIBE TO OUR NEWSLETTER

Termux Setup Basics

Challenge Description

What is Termux?

Learning Objectives

Your Task

Termux Terminal Simulator

Submit Flag

Need a Hint?

Android App Analysis

Challenge Description

What is Android App Analysis?

Learning Objectives

Your Task

Sample Application: SecureChat v1.0

Package Name

Version

Min SDK

Target SDK

Android Permissions

Decompiled Code Snippet

Submit Flag

Need a Hint?

Network Scanning

Challenge Description

What is Network Scanning?

Learning Objectives

Your Task

Nmap Scan Results

Vulnerability Information

Submit Flag

Need a Hint?

Permission Bypass

Challenge Description

What are Android Permissions?

Learning Objectives

Your Task