WebDasm

WebDasm is a client-side reverse engineering and binary analysis tool. It runs entirely in the browser using a Rust/WebAssembly analysis engine and a React frontend. Since there is no backend server, your binaries are never uploaded anywhere.

Features

• Disassembly: x86/x64 disassembly powered by iced-x86.
• Control Flow Graph (CFG): Basic block detection and interactive CFG rendering via Cytoscape.js.
• Binary Parsing: Supports PE, ELF, Mach-O, and raw shellcode/hex strings.
• x86 Emulator: Instruction-level step-by-step emulation with register and stack tracking.
• Decompiler: Basic pseudo-C code generation from assembly.
• Heuristics: Detects common exploit patterns like PEB access (fs:[0x30]), CPUID/RDTSC usage, and INT3 padding.
• Signatures: FLIRT-style byte pattern matching.

Architecture

The project is split into two parts:

• core/: The analysis engine written in Rust. Compiled to WebAssembly via wasm-pack.
• web/: The frontend UI built with React, Vite, and Tailwind CSS. Analysis runs inside a Web Worker to prevent UI blocking.

Building and Running

You will need Node.js and Rust installed, along with wasm-pack.

1. Build the WASM core:

cd core
wasm-pack build --target web

2. Run the React frontend:

cd web
npm install
npm run dev

Then open http://localhost:5173.

Shortcuts

• N: Rename symbol/address
• ;: Add inline comment
• F5: Toggle Disassembly / Pseudocode
• Ctrl+G: Jump to address
• Shift+Click: Quick comment

License

MIT