Executable File Viewer

Analyzing code with an executable file viewer involves inspecting the binary structure, metadata, embedded data, and compiled instructions of a compiled application without actually running it. This method is a core component of static malware analysis and reverse engineering. It bridges the gap between raw binary bytes and human-readable application logic. Types of Executable Viewers

To effectively inspect an executable, engineers rely on four main classes of binary viewing software:

PE/ELF Structure Viewers: Tools like CFF Explorer, Exeinfo PE, or PEview inspect formatting frameworks (Portable Executable for Windows or ELF for Linux).

Hex Editors: Tools like HxD, 010 Editor, or command-line hexdump show raw hexadecimal bytes alongside an ASCII interpretation grid.

Decompilers: Software like dnSpy (for .NET), ILSpy, or Ghidra reconstruct high-level source code (C# or C-like pseudo-code) directly from compiled binaries.

Disassemblers: Tools like IDA Pro, Ghidra, or the command-line utility objdump translate raw binary code into human-readable Assembly instructions. Step-by-Step Code Analysis Process 1. Analyze File Headers and Metadata

Open the program in a structure viewer to inspect the compiler stamps and entry points.

File Signatures (Magic Bytes): Verify the format (e.g., Windows executables start with MZ or 4D 5A in hex).

Entropy and Packing: Look for packing signatures via Exeinfo PE. High mathematical entropy (randomness) usually means the executable code is encrypted or compressed to hide its true intent.

Compile Time: Check the compiler time stamp to understand when the binary was built. 2. Inspect Executable Sections

Executable code is split into logical segments. Viewers map these boundaries out cleanly:

.text / .code: Contains the physical CPU instructions. Note the Entry Point address, which shows exactly where code execution begins.

.data: Contains hardcoded global variables and static values.

.rsrc: Holds resources like application icons, embedded images, manifest templates, or hidden secondary binaries. 3. Extract Embedded Strings

Run a strings-extraction pass inside the viewer. This scans the binary file for readable text chunks. Convert .EXE to Source Code!