Mali-Yogesh/Mali-Yogesh-Cyber-Forensic-Tool--Bltool-
GitHub: Mali-Yogesh/Mali-Yogesh-Cyber-Forensic-Tool--Bltool-
一款取证级 BitLocker 镜像与恢复工具,解决证据保全与多遍恢复难题。
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# 🔐 Bltool
### 取证级 BitLocker 镜像与恢复工具
**Developed at I4C — Indian Cyber Crime Coordination Centre**
**Ministry of Home Affairs, Government of India**
**IFSO Special Cell, Delhi Police**
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## 📌 什么是 Bltool?
**bltool** is a **forensic-grade, command-line disk imaging utility** specifically engineered for **BitLocker-encrypted storage devices**. It was designed and developed during a **10-week Winter Internship at I4C (Indian Cyber Crime Coordination Centre), Ministry of Home Affairs, Government of India**.
The tool solves a critical real-world problem faced by law enforcement agencies during cybercrime investigations: **how do you forensically acquire a BitLocker-encrypted drive — especially a physically damaged one — without expensive proprietary software, and without losing a single byte of evidence?**
bltool answers that question completely.
## 🚨 它要解决的问题 — 为何存在 Bltool
During cybercrime investigations at IFSO, a recurring challenge was identified:
| Problem | Impact |
|---|---|
| Seized Windows devices are BitLocker-encrypted | Standard `dd` or open-source tools cannot read them |
| Existing tools (FTK Imager, EnCase) cost ₹3–10 Lakh per license | Not accessible to all state police units |
| Damaged drives with bad sectors | Single-pass tools **silently zero-fill** unreadable sectors — **irreversible evidence loss** |
| No unified tool for decrypt + image + analyze | Investigators use 3–4 tools, breaking chain of custody |
**bltool eliminates all four problems in a single executable.**
In one documented test case: a single-pass tool silently zero-filled **2,048 sectors** on a 7.7 million sector drive — sectors that potentially contained NTFS MFT entries. bltool's multi-pass engine **recovered 1,987 of those sectors**, preserving evidence that would have been permanently destroyed.
## ⚡ 为什么 bltool 优于其他工具
This is the **only tool in existence** that combines all three capabilities simultaneously:
```
FTK Imager = BitLocker Support ✅ | Multi-pass Recovery ❌ | Free ❌
GNU ddrescue = BitLocker Support ❌ | Multi-pass Recovery ✅ | Free ✅
bltool = BitLocker Support ✅ | Multi-pass Recovery ✅ | Free ✅ ← UNIQUE
```
| Feature | bltool | FTK Imager | GNU ddrescue | Autopsy |
|---|:---:|:---:|:---:|:---:|
| **BitLocker Native Decrypt** | ✅ Built-in | ⚠️ OS-dependent | ❌ | ❌ |
| **3-Phase Multi-Pass Recovery** | ✅ | ❌ Limited | ✅ | ❌ |
| **No API Dependency for Decryption** | ✅ | ❌ | ❌ | ❌ |
| **NTFS MFT Full Parse** | ✅ | ✅ | ❌ | ✅ |
| **Signature-Based File Carving** | ✅ 7+ types | ✅ Extensive | ❌ | ✅ |
| **HMAC-Signed Audit Log** | ✅ | ❌ | ❌ | ❌ |
| **Sector-Status Map File** | ✅ | ❌ | ✅ | ❌ |
| **Resumable Acquisition** | ✅ | ❌ | ✅ | ❌ |
| **Chain of Custody Documentation** | ✅ Full | ✅ Partial | ❌ | ⚠️ |
| **Cost** | 🆓 Free | 💰 Paid | 🆓 Free | 🆓 Free |
| **Windows 7–11 Support** | ✅ All | ✅ | ❌ | ✅ |
| **Data Recovery Rate (Damaged)** | **99.85%** | ~97% | 99.5% | N/A |
| **Encryption + Recovery Combined** | ✅ **UNIQUE** | ❌ | ❌ | ❌ |
## 🏛️ 起源与可信度
| Detail | Info |
|---|---|
| **Developed at** | I4C — Indian Cyber Crime Coordination Centre |
| **Under** | Ministry of Home Affairs, Government of India |
| **Supervised by** | Cyber Forensic Expert, IFSO |
| **Certified by** | ACP, Special Cell, IFSO Delhi Police |
| **Duration** | 15 December 2025 — 19 February 2026 |
| **Compliance** | ACPO Digital Evidence Guidelines, NIST SP 800-101 |
## 🎯 核心能力
### 🔓 1. BitLocker 解密引擎(无需 Microsoft API)
Bltool implements the **complete BitLocker key derivation chain from scratch**:
```
48-digit Recovery Key
↓
PBKDF2 Derivation → VMK Decrypt Key
↓
AES-CCM Decryption → Volume Master Key (VMK)
↓
KDF (Key Derivation) → Full Volume Encryption Key (FVEK)
↓
AES-XTS / AES-CBC → Per-Sector Plaintext
```
- Supports **AES-XTS-128** and **AES-XTS-256** (modern Windows 10/11)
- Supports **AES-CBC + Elephant Diffuser** (legacy Windows Vista/7)
- Parses all **three redundant metadata blocks** — works even on partially damaged drives
- Compatible with **Windows Vista through Windows 11** BitLocker variations
- Also supports **WMI-based passthrough** unlock for OS-assisted acquisition
### 📀 2. 三阶段多遍成像引擎
Inspired by **GNU ddrescue's** battle-tested methodology, bltool implements a superior three-phase strategy:
```
┌─────────────────────────────────────────────────────────────────────┐
│ PHASE 1 — Fast Forward Pass │
│ Block size: 64KB–512KB | Strategy: Skip errors, capture readable │
│ Goal: Image 99%+ of drive at maximum speed │
├─────────────────────────────────────────────────────────────────────┤
│ PHASE 2 — Retry Pass │
│ Block size: 4KB–16KB | Strategy: Revisit errors, reverse read │
│ Goal: Recover intermittent / transient bad sectors │
├─────────────────────────────────────────────────────────────────────┤
│ PHASE 3 — Scraping Pass │
│ Block size: 512B–1KB | Strategy: Sector-by-sector maximum retries │
│ Goal: Last-resort recovery of every remaining readable bit │
└─────────────────────────────────────────────────────────────────────┘
```
**Result on Device B (2,048 bad sectors):**
- Zero-fill baseline: **96.74%** recovery
- After Phase 1: **99.74%**
- After Phase 2: **99.83%**
- After Phase 3: **99.85%** — **1,987 additional sectors saved**
### 🗂️ 3. NTFS 文件系统解析器(无需第三方工具)
Full MFT (Master File Table) traversal and reconstruction:
| NTFS Attribute | Forensic Value |
|---|---|
| `$STANDARD_INFORMATION` (0x10) | Created/Modified/Accessed timestamps, owner SID |
| `$FILE_NAME` (0x30) | Filename, parent directory, tamper-resistant timestamps |
| `$DATA` (0x80) | File content — resident or non-resident with runlist |
| `$INDEX_ROOT/$INDEX_ALLOC` (0x90/0xA0) | Directory B-tree index reconstruction |
| `$OBJECT_ID` (0x40) | Global file GUID — tracks moves and renames |
| `$LOGGED_UTILITY_STREAM` (0x100) | EFS metadata, alternate data streams |
### 🔍 4. 基于签名的文件雕刻引擎
Recovers files **without relying on file system structures** — works on corrupted volumes and unallocated space:
| File Type | Header (Hex) | Max Size | Evidence Value |
|---|---|---|---|
| JPEG Image | `FF D8 FF E0/E1` | 30 MB | Very High |
| PDF Document | `25 50 44 46` | 500 MB | Very High |
| PNG Image | `89 50 4E 47` | 50 MB | High |
| ZIP/DOCX/XLSX | `50 4B 03 04` | 200 MB | High |
| SQLite Database | `53 51 4C 9 74 65` | 2 GB | High |
| Windows EXE | `4D 5A` | 100 MB | Medium |
| MP4/Video | `00 00 00 xx 66 74 79 70` | 4 GB | High |
### 🔐 5. 取证完整性与证据链
| Principle | Implementation |
|---|---|
| **Data Integrity** | MD5 + SHA-256 dual hashing; incremental hash during acquisition |
| **Write Protection** | Source opened with `GENERIC_READ` only; `WriteFile` blocked at driver layer |
| **Authenticity** | **HMAC-SHA256 signed log files** — tamper-evident audit trail |
| **Transparency** | Every sector read, retry, error logged with **millisecond timestamps** |
| **Reproducibility** | Deterministic algorithms; full configuration logged for exact reproduction |
| **Legal Admissibility** | ACPO principle compliance; court-accepted forensic report format |
## 🏗️ 系统架构
### 编译模块分解
| Module | Responsibility | Key Algorithms |
|---|---|---|
| `aes_xts.obj` | AES-XTS sector decryption | XTS-AES-128/256; LBA-based tweak; sector IV |
| `aes_cbc.obj` | AES-CBC key unwrapping | VMK decrypt; FVEK unwrap; CBC legacy support |
| `crypto_utils.obj` | Hashing & crypto utilities | MD5, SHA-256, HMAC-SHA256, key derivation |
| `bitlocker_metadata_compat.obj` | BitLocker metadata parsing | FVE header parse; VMK protector enum; multi-version |
| `attribute_list.obj` | NTFS MFT handling | MFT traversal; attribute parsing; directory tree |
| `decrypted_disk.obj` | Decrypted volume I/O | Virtual disk interface; write-block enforcement |
| `command_parser.obj` | CLI argument parsing | Argument validation; operation routing; help system |
| `libcrypto-3-x64.dll` | OpenSSL crypto runtime | AES engine; EVP abstraction (external) |
| `winfsp-x64.dll` | Windows File System Proxy | FUSE-like virtual volume mounting (external) |
### 项目结构
```
bltool/
├── src/
│ ├── bitlocker/ # FVE parsing, VMK/FVEK key hierarchy
│ ├── crypto/ # AES-XTS, AES-CBC implementations
│ ├── disk/ # Physical/logical/image disk readers
│ ├── ntfs/ # MFT parser, runlist decoder, directory
│ ├── imaging/ # Multi-pass acquisition engine + hashing
│ ├── recovery/ # File carving, MFT undelete
│ ├── mounting/ # WinFsp virtual mounter
│ ├── winfsp/ # FS callbacks
│ ├── hashing/ # Multi-hash engine
│ ├── reporting/ # Forensic report generator
│ ├── cli/ # Command-line interface
│ ├── cache/ # LRU sector & MFT cache
│ ├── repair/ # Volume repair utilities
│ └── virtual_disk/ # DecryptedDisk abstraction
├── services/
│ ├── evidence_source # Unified evidence abstraction
│ ├── forensic_session # Session & case manager
│ ├── carve_engine # Signature-based file carver
│ ├── search_engine # Keyword/regex search
│ ├── timeline_builder # Filesystem event timeline
│ ├── case_manager # SQLite case persistence
│ └── registry # Windows registry parser
├── gui/ # Qt-based panels (Dashboard, Imaging, Recovery...)
├── forensic_ui/ # Web UI (index.html, app.js, components.js)
├── include/ # Header files
├── docs/ # Documentation
├── build/ # MSVC Release — bltool.exe + DLLs
├── CMakeLists.txt
├── README.md
├── LICENSE
├── IMPLEMENTATION_SUMMARY.md
└── INTEGRITY_VERIFICATION.md
```
## 🚀 快速开始
### 先决条件
| Requirement | Version | Purpose |
|---|---|---|
| Windows OS | 10/11 x64 | Platform |
| Administrator Privileges | Required | Direct disk access |
| OpenSSL (libcrypto) | 3.x x64 | Crypto engine (bundled) |
| WinFsp | 2.0+ | Virtual FS mounting (bundled) |
| Visual C++ Runtime | 2022 x64 | C++ runtime (bundled) |
### 硬件要求
| Component | Minimum | Recommended |
|---|---|---|
| CPU | x64, 2 cores, 2.0 GHz | 8+ cores, 3.5+ GHz (AES-NI) |
| RAM | 4 GB | 16 GB+ (large image analysis) |
| Storage | Equal to source size | 2× source (for merge operations) |
| Interface | USB 3.0 / SATA | USB 3.2 / NVMe PCIe |
| Write Blocker | Software (tested) | Hardware (Tableau/Wiebetech — court) |
### 安装
```
# 1. 下载最新版本
# 2. 解压到取证工作站
# 3. 以管理员身份运行(访问物理磁盘必需)
# 验证安装
bltool.exe --version
```
## 💻 CLI 参考
### 命令概述
```
bltool 标签:ACPO, AES-XTS, BitLocker, C++, CBC, HTTPS请求, NTFS解析, OpenSSL, SecList, TPM, Windows取证, 内存取证, 加密破解, 取证工具, 安全测试工具, 恢复密钥, 数字调查, 数据恢复, 数据恢复工具, 数据擦除, 文件 carving, 硬盘取证, 磁盘成像, 磁盘解密, 磁盘镜像, 虚拟挂载, 证据保全, 路径枚举