8 Android Hacking Courses: A Guide to Learning Mobile Security

Android hacking works by examining Android devices and applications for weaknesses in their architecture, permissions, storage, communications, and runtime behavior.

Android uses a layered architecture, with the Linux kernel at its core and the hardware abstraction layer (HAL), Android Runtime (ART), native libraries, application framework, and system apps built on top of it (Google, 2024).

The kernel provides core functionality such as memory management, device drivers, and low-level security enforcement. Exploiting kernel vulnerabilities can give an attacker privileged control over an Android system, potentially allowing the attacker to bypass app sandboxing, escalate privileges, or access protected data, depending on the exploit, device state, and security controls in place. Android also uses SELinux to enforce mandatory access control across all processes, including those with root privileges (Google, 2026e).

ART translates app bytecode into processor-specific instructions that the device executes (Google, 2026c). The application sandbox is enforced through app-specific Linux user IDs (UIDs) at the kernel level, together with the Android permission model and SELinux policies (Google, 2026b). The application framework coordinates interactions between apps and system services (Google, 2026c). If an attacker exploits vulnerabilities in the framework or in application code that uses it, they may gain access to data handled by the affected app or exposed through vulnerable interprocess communication (IPC), misconfigured permissions, or exported components.

Depending on the nature of the app, this data can be highly sensitive. For instance, a vulnerable banking app could expose session tokens, credentials, transaction data, or other sensitive information if its application logic, storage, communications, or runtime behavior were compromised.

Moreover, the user-facing layer, including system apps and user interface (UI) components, provides the familiar environment through which users interact with Android devices. Attackers may abuse app- and UI-level interactions through techniques such as phishing screens, overlay attacks, notification abuse, or misuse of accessibility services to deceive users or manipulate interface interactions. These techniques can support broader compromise attempts, especially when combined with credential theft, abuse of sensitive permissions, or vulnerable app components.

Android security testing and modification can involve several techniques across these layers. Rooting is a common Android modification technique that can provide root access to the operating system (OS), allowing users to install software or modify settings that would otherwise be unavailable. Installing a custom ROM is another common Android modification approach that replaces the device’s stock OS with a customized version. In security contexts, custom ROMs can support authorized testing or research, while untrusted or maliciously modified ROMs can introduce security risks. Android documentation notes that unlocking the bootloader enables partitions to be reflashed and that the device should undergo a factory data reset to prevent unauthorized access to its data (Google, 2026d).