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KernelFlirt

★ 30 Open GitHub ↗

KernelFlirt is powerful kernel debugger.

// repository documentation

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# KernelFlirt

Windows kernel-level debugger with an OllyDbg/IDA Pro-style interface. Designed for security research, reverse engineering, and malware analysis in VM environments (VMware).

![KernelFlirt](https://raw.githubusercontent.com/AkaTorich/KernelFlirt/main/docs/screenshot.png)

## Architecture

```
  Host machine                           VM (Windows 10, testsigning)
┌──────────────────┐    TCP:31337    ┌──────────────────┐     IOCTL      ┌──────────────────┐
│  KernelFlirt UI  │◄───────────────►│   KfRelay.exe    │◄──────────────►│ KernelFlirt.sys  │
│  (WPF / .NET 9)  │  CMD+DBG ch.    │   (TCP proxy)    │  DeviceIoCtl   │ (WDM Driver)     │
└──────────────────┘                 └──────────────────┘                └──────────────────┘
                                     ┌──────────────────┐  SCM API
                                     │  KfLoader.exe    │──────────────────────┘
                                     │  (C / Console)   │  load / unload / status
                                     └──────────────────┘
```

| Component | Language | Description |
|-----------|----------|-------------|
| **KernelFlirt.UI** | C# / WPF | Debugger interface (runs on host) |
| **KernelFlirt.sys** | C / WDM | Kernel driver — memory, breakpoints, KdTrap inline hook |
| **KfRelay.exe** | C | TCP relay on VM, proxies IOCTLs over network |
| **KfLoader.exe** | C | CLI to load/unload the driver via SCM |
| **KfConsole.exe** | C# / .NET 9 | Console debugger — WinDbg/x64dbg-style REPL over the same driver |
| **KernelFlirt.SDK** | C# / .NET 9 | Plugin SDK — full debugger API for extensions |

## Quick Start

```cmd
:: VM — load driver and start relay
KfLoader.exe load
KfRelay.exe

:: Host — launch the UI and connect
KernelFlirt.exe → Connect → VM IP
```

1. **File → Open** — browse VM filesystem, select EXE/SYS
2. Process created suspended, entry point BP set automatically
3. **F9** — run to entry point, symbols and modules load
4. Set breakpoints, step through code, inspect memory and registers

Kernel driver debugging: open **Kernel Modules** tab, find your driver, set breakpoints on any function — user-mode and kernel-mode.

## Console Front-End (KfConsole)

Don't need the WPF UI? `KfConsole.exe` (in `bin\Console\`) is a WinDbg/x64dbg-style REPL
over the same driver and relay.

```text
kf> connect 10.100.102.6:31337
✓ connected (10.100.102.6:31337), driver v0x10000

kf*> open C:\Temp\target.exe
✓ created PID=8424 TID=10136 ImageBase=00007FF7`2EA10000 (x64)
symbols: 3/4 modules loaded

kf(8424:10136/x64/brk)> bp ntdll!NtCreateFile if rcx!=0
✓ bp [1] 00007FFF`BBF8E030  ntdll!NtCreateFile  if rcx!=0

kf(8424:10136/x64/brk)> g
*** BP at 00007FFF`BBF8E030  ntdll!NtCreateFile

kf(8424:10136/x64/brk)> u rip 5
►  00007FFF`BBF8E030  4c 8b d1  mov r10, rcx  ntdll!NtCreateFile
```

**Highlights:** x64 + WoW64 (x86) targets, PDB symbol resolution via Microsoft Symbol Server,
expression evaluator (`rsp+8`, `[rsp]`, `module!func`), conditional breakpoints,
Step Into / Step Over / Step Out, anti-debug primitives, ANSI-colored output,
readline with persistent history.

Full command reference: [docs/cli.md](docs/cli.md)

## Features

### Debugging
- Software breakpoints (INT3), hardware breakpoints (DR0-DR3), memory breakpoints (PAGE_GUARD)
- Hardware watchpoints — write and read/write data (1/2/4/8 bytes)
- Conditional and logging breakpoints
- Step into (F7), step over (F8), step out (Ctrl+F9), run to cursor (F4)
- Register editing — modify any GPR, RIP, RFLAGS, DR0-7
- Inline assembler, NOP patching, patch tracking with undo

### Analysis
- Hex dump with binary pattern search (`??` wildcards)
- String search (ASCII/Unicode) across all modules
- Module, thread, call stack, SEH chain enumeration
- Imports, exports, sections, functions lists
- Memory allocation, protection changes, snapshot & diff
- RetDec decompiler with theme-aware C syntax highlighting
- IDA-style navigation bar — color-coded section map with RIP/breakpoint/bookmark markers
- PDB symbol resolution via Microsoft Symbol Server
- User-defined function naming with `RegisterFunction`

### Themes
9 built-in themes (default-dark, x64dbg, monokai, ollydbg, ollydbg-light, ida-pro, dracula, long_night, sakura) with runtime switching and 100+ customizable color keys.

## Plugins (17)

### Reverse Engineering
| Plugin | Description |
|--------|-------------|
| **Graph View** | IDA-style CFG with block coloring, collapse/expand, function navigation |
| **Xrefs** | Cross-references — find all callers/references to any address |
| **FLIRT Signatures** | Function recognition by byte patterns (.pat + built-in MSVC CRT) |
| **Signature Detector** | PEiD-compatible packer/compiler detection (4445 signatures) |
| **PE Rebuilder** | PE dumper with IAT reconstruction (Scylla-style) |
| **String Decryptor** | Automated string decryption |
| **VulnHunter** | Dangerous API usage scanner |

### Dynamic Analysis
| Plugin | Description |
|--------|-------------|
| **API Monitor** | Real-time API interception with parameter logging |
| **Network Monitor** | Network traffic capture (send/recv/connect) with CSV export |
| **Memory Scanner** | Value scanning with subsequent filtering |
| **Themida Unpacker** | Automated Themida/WinLicense unpacker |

### Automation & AI
| Plugin | Description |
|--------|-------------|
| **C# Scripting** | Roslyn REPL with full debugger API, syntax highlighting, persistent state |
| **AI Assistant** | Reverse engineering assistant (OpenAI-compatible) with 65+ debugger tools |
| **MCP Server** | Model Context Protocol — connect AI clients (Claude Code, Cursor) to debugger |
| **Session Manager** | Save/load session (breakpoints, comments, function names) with ASLR rebase |
| **Bookmarks/Notes** | Address bookmarks with annotations, persisted between sessions |
| **Anti-Debug Bypass** | Automatic PEB/DebugPort/ThreadHide/HeapFlags patching |

All plugins share a common SDK with access to memory, breakpoints, symbols, UI, events, execution control, and cross-plugin communication.

## Keyboard Shortcuts

| Key | Action |
|-----|--------|
| F2 | Toggle breakpoint |
| F4 | Run to cursor |
| F5 / F9 | Continue / Run |
| F7 | Step into |
| F8 | Step over |
| Ctrl+F9 | Step out |
| F12 | Pause |
| Space | Inline assembler |
| Ctrl+G | Go to address |
| Ctrl+F | Binary search |
| F11 | Fullscreen |
| Shift+F5 | Run script |

## Documentation

| Document | EN | RU |
|----------|----|----|
| **SDK & Plugin Development** | [SDK-en.md](docs/SDK-en.md) | [SDK-ru.md](docs/SDK-ru.md) |
| **C# Scripting Reference** | [scripting-reference-en.md](docs/scripting-reference-en.md) | [scripting-reference-ru.md](docs/scripting-reference-ru.md) |
| **CLI (KfConsole)** | [cli.md](docs/cli.md) | — |
| **Changelog** | [CHANGELOG.md](CHANGELOG.md) | |

### SDK (~55 pages)
Complete guide to building KernelFlirt plugins: project setup, all API interfaces with full parameter descriptions, data models, UI development (WPF/theming), events, threading, cross-plugin communication, persistence, anti-debug API, 4 complete example plugins, best practices.

### Scripting Reference (~30 pages)
C# REPL scripting guide: all shortcuts and API methods with parameters, 12 data models, 18+ real-world recipes (PE analysis, string decryption, IAT reconstruction, unpacker scripting, memory scanning, API tracing), tips & pitfalls.

## Building

**Requirements:** Visual Studio 2022 (C++), WDK 10.0.26100.0+, .NET 9 SDK, Windows 10/11 x64

```powershell
.\build.ps1                          # Release
.\build.ps1 -Configuration Debug     # Debug
```

Output: `bin/Driver/`, `bin/Loader/`, `bin/Relay/`, `bin/UI/` (+ plugins + themes), `bin/Console/`

## Safety

- **VM only** — intended for virtual machines with testsigning enabled
- **Not for production** — the driver modifies kernel code (inline hook on KdpStub)

## License

For educational and security research purposes only. Use responsibly in authorized environments.

KernelFlirt

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