BinSight

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Analyze the so file in APK through LLM+Capstone to determine the main intention of the so file and the developer (company)

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# BinSight

**BinSight** is an advanced APK analysis tool that dissects native libraries (`.so` files) and leverages the power of Large Language Models (LLMs)—augmented by **live web search results**—to determine their purpose, developer, and potential security implications. It automates the reverse engineering process of binary analysis, making it faster, more accurate, and more accessible.

## Features

- **APK Extraction**: Automatically extracts all `.so` native libraries from a given Android APK.
- **Live Web Search**: Performs a web search for each library to gather real-time, public information about its developer and purpose.
- **Multi-Arch Disassembly**: Uses `pyelftools` and `capstone` to disassemble code for ARM, ARM64, x86, and x86-64 architectures.
- **Rich Data Extraction**: Pulls not just assembly code, but also function names and embedded strings for a more context-rich analysis.
- **Flexible LLM Integration**: Powered by `litellm`, it supports over 100 LLMs from various providers (OpenAI, Google, Anthropic, Cohere, and any OpenAI-compatible API).
- **Configurable & Easy to Use**: Simple command-line interface allows you to specify the target APK, choose your LLM, and configure custom API endpoints and keys.

## Installation

1.  **Clone the repository (optional):**
    If you have the project files, you can skip this step.
    ```bash
    git clone <repository_url>
    cd binsight-project
    ```

2.  **Install dependencies:**
    Ensure you have Python 3.6+ installed. Then, install the required packages from `requirements.txt`.
    ```bash
    pip install -r requirements.txt
    ```

## Usage

The script is run from the command line with several options to customize its behavior.

### Command Syntax

```bash
python binsight.py <target_path> [options]
```

### Arguments

-   `target_path`: (Required) The path to a single `.apk` file or a directory containing multiple `.apk` files.
-   `--model`: The LLM model to use, in `litellm` format (e.g., `gemini/gemini-1.5-flash`).
-   `--api_key`: Your API key for the chosen provider. If not set, the tool will look for a corresponding environment variable (e.g., `GOOGLE_API_KEY`, `OPENAI_API_KEY`).
-   `--api_base`: The API base URL for non-standard providers like SiliconFlow or a self-hosted model.

---

### Examples

#### Example 1: Standard Analysis with Gemini

This is the simplest use case. It assumes you have your Google API key set in the environment.

1.  **Set the environment variable:**
    ```bash
    export GOOGLE_API_KEY="your_google_api_key"
    ```

2.  **Run the analysis:**
    ```bash
    python binsight.py /path/to/your_app.apk --model "gemini/gemini-1.5-flash"
    ```

#### Example 2: Custom OpenAI-Compatible Provider (e.g., SiliconFlow)

This example shows how to use an OpenAI-compatible endpoint, like SiliconFlow. Based on the official [LiteLLM Documentation](https://docs.litellm.ai/docs/providers/openai_compatible), you must prefix the model name with `openai/` to route the request correctly.

```bash
python binsight.py /path/to/your_app.apk \
  --model "openai/Qwen/Qwen3-235B-A22B" \
  --api_base "https://api.siliconflow.cn/v1" \
  --api_key "your_siliconflow_api_key"
```
*Note: The `openai/` prefix is required for `litellm` to use its standard OpenAI-compatible client.*

## How It Works

1.  **Extract**: The input APK is unzipped, and all `.so` files are copied to a temporary location.
2.  **Web Search**: For each `.so` file, BinSight performs a web search to find its likely purpose and developer.
3.  **Disassemble**: The tool identifies the library's architecture, locates the executable `.text` section, and disassembles the machine code into human-readable assembly instructions.
4.  **Analyze**: A detailed prompt containing the **web search results**, filename, assembly code, function names, and strings is sent to the configured LLM via `litellm`.
5.  **Report**: The LLM's conclusion about each library's purpose and developer is collected and printed in a final summary report.
6.  **Clean Up**: All temporary files are deleted.

## Supported Models

This tool uses **`litellm`** to interact with language models. This means you can use any of the 100+ models supported by `litellm`.

-   To find the correct model identifier string, please refer to the official **[LiteLLM Provider List](https://docs.litellm.ai/docs/providers)**.

## Core Workflow

1.  **Universal LLM Interface**: BinSight uses `litellm` as a unified gateway to over 100 LLM providers. This removes the need for provider-specific code and allows for seamless integration of new models.
2.  **Dynamic Analysis Pipeline**:
    *   **APK Deconstruction**: Extracts all unique `.so` libraries from the target APK.
    *   **Metadata Extraction**: Uses `pyelftools` and `Capstone` to get assembly code, function names, and embedded strings from each library.
    *   **Intelligent Analysis via LLM**: Sends this rich metadata package to the user-selected LLM. The prompt directs the model to act as a security expert, first identifying the library by name using its internal knowledge, then corroborating that with the provided binary evidence.
3.  **Unified Results**: It presents a clear, concise summary of the likely purpose for each analyzed library.

## Setup

1.  **Clone the repository.**

2.  **Install Dependencies**:
    ```bash
    pip install -r requirements.txt
    ```

3.  **Set API Keys (Environment Variables)**:
    `litellm` automatically finds API keys set as environment variables. Set the key for the provider you intend to use.

```bash
    # For OpenAI models (gpt-4o, gpt-4-turbo, etc.)
    export OPENAI_API_KEY="YOUR_OPENAI_KEY"

# For Google models (gemini/gemini-1.5-pro, etc.)
    export GEMINI_API_KEY="YOUR_GEMINI_KEY"
    
    # For SiliconFlow models
    export SILICONFLOW_API_KEY="YOUR_SILICONFLOW_KEY"
    ```

## Usage

Run BinSight against a single APK file or an entire directory. The `--model` argument is now the central piece of the command.

### Model Selection

You specify the model using the format recognized by `litellm`. Here are some common examples:

*   **Gemini**: `gemini/gemini-2.5-pro`
*   **SiliconFlow**: `openai/Qwen/Qwen3-32B`

### Command Examples

```bash
# Analyze with OpenAI's GPT-4o (requires OPENAI_API_KEY)
python binsight.py /path/to/app.apk --model gpt-4o --api_key "YOUR_KEY"

# Analyze with Google's Gemini Pro (requires GEMINI_API_KEY)
python binsight.py /path/to/app.apk --model gemini/gemini-2.5-flash --api_key "YOUR_KEY"

# Analyze with SiliconFlow's Qwen/Qwen3-32B, providing the key directly
python binsight.py /path/to/app.apk --model "openai/Qwen/Qwen3-32B" --api_base "https://api.siliconflow.cn/v1" --api_key "YOUR_KEY" 
```

### All Arguments

*   `input_path`: **Required**. Path to an APK file or a directory of APKs.
*   `--model`: **Required**. The model identifier for `litellm`.
*   `--api_key`: Optional. Provide the API key directly. Overrides environment variables.
*   `--api_base`: Optional. The API base URL for custom providers (e.g., SiliconFlow, local models).

## Demo Analysis Result

Here is a sample output from analyzing an APK using `openai/Qwen/Qwen3-32B`.

```plaintext
$ python binsight.py /path/to/some.apk --model openai/Qwen/Qwen3-32B --api_base "https://api.siliconflow.cn/v1"  --api_key "sk-xxx"

==================================================
Starting analysis for: some.apk
==================================================

--- Comprehensive Analysis (Disassembly + LLM) ---

[*] Processing: libflutter.so (from lib/arm64-v8a/libflutter.so)
  -> Analyzing with litellm (model: openai/Qwen/Qwen3-32B, attempt: 1/3)...
  [+] LLM analysis result: Intent: Google Flutter UI Framework | Confidence: High | Evidence: Known library name confirmed by numerous 'flutter::' and 'dart::' function names and strings like 'Flutter Engine'.

------------------------------------
           Final Analysis Summary for some.apk
------------------------------------

Analysis complete! Found 1 SDKs or code intents:

- Intent Analysis - libflutter.so
  Intent: Google Flutter UI Framework | Confidence: High | Evidence: Known library name confirmed by numerous 'flutter::' and 'dart::' function names and strings like 'Flutter Engine'.

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