VB Decompiler - Advanced Visual Basic 5.0/6.0 and C# Decompilation Tool
VB Decompiler is the perfect source code recovery solution for Visual Basic 5.0/6.0, Visual Basic .NET, and Visual C# applications. Fast and powerful x86, x64 and MS IL disassemblers for Visual Studio 6 and Visual Studio .NET compiled files.
Source code loss is a very serious problem for many software developers. Most Visual Basic 5.0/6.0 applications were developed years ago, and their source code (.vbp, .frm, and .bas files) has been lost due to system migrations, hard drive failures, or backup issues.
Based on the experience of our customers, losing source code can be a tragedy. Just imagine: you've spent months developing a program, but now all that remains is the compiled EXE file with DLL libraries.
Visual Basic 6.0 Source Code Recovery
Visual Basic 5.0 and 6.0 has two compilation modes: P-Code (pseudo code) and Native Code (assembler). When disaster strikes and your source code is lost, VB Decompiler provides comprehensive recovery:
- P-Code: Recovers pseudocode to standard Visual Basic instructions with highest accuracy (up to 85% recovery rate), processes COM OLE objects and API calls
- Native Code: Powerful disassembler, code emulator and decompiler supports decompilation with up to 75% recovery rate. Also you can increase this recovery rate using AI features.
- Tracing engine: Step-by-step code execution emulation for deep Native Code analysis (Professional/Ultimate editions)
- Complete form restoration - decompiles forms (frm, frx) and user controls (ctl, ctx) with all properties
- API calls restoration - recovers prototypes of most standard Win32 APIs automatically
.NET and C# Decompilation
Full support for Visual Studio 2022 and earlier versions using .NET Framework or .NET Core:
- Decompiles and disassembles Visual Basic .NET, C#, and other .NET-compatible languages
- Restores MS IL code to C# code with high accuracy
- Recovers code structure from assembly tables and metadata
Variable names, private procedure names and some other parts cannot be recovered, but you'll get the perfect starting point for complete code recovery.
Malware Analysis and Forensic Investigation
VB Decompiler is a perfect tool for cybersecurity professionals, antivirus analysts, and digital forensic experts. VB Decompiler's Analytic Features dramatically accelerate malware analysis and backdoor detection by providing instant insights into suspicious program behavior.
Automated Behavior Analysis: Get a comprehensive Analytic Report that instantly identifies which procedures and functions perform suspicious operations:
- File system manipulation - detects procedures that create, modify, or delete files
- Registry modifications - identifies code that changes Windows registry keys
- Network activity - reveals procedures that download files or connect to remote servers
- Process manipulation - shows code working with Windows processes and services
- Memory access - detects direct memory manipulation via VarPtr and CallByName
- Window operations - identifies procedures that hide windows or manipulate UI elements
Save weeks of manual analysis time. Instead of reading through thousands of lines of disassembled code, you immediately see a structured report highlighting all potentially malicious functions. This is invaluable for incident response teams, malware researchers, and forensic investigators working under time pressure.
Professional Tools Included
- Universal x86 unpacker - automatically unpacks UPX, NSPack, and other popular packers
- Built-in HEX Editor - powerful binary editor with Copy/Paste and Undo/Redo
- Syntax coloring - color-highlighted code for better readability
- Multiple export formats - saves to MAP file, IDA script, or HIEW Names file
No dependencies required: VB Decompiler works on any supported 32-bit or 64-bit Windows system, as well as Linux systems (with Wine), without requiring .NET Framework installation.
Ready to start? Download free Lite version or purchase a license today.
Complete documentation:English Japanese German Russian Italian Chinese Spanish Portuguese