docs: add comprehensive MITRE ATT&CK technique mapping

docs/MITRE_ATTACK_COVERAGE.md

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+# MITRE ATT&CK Detection Coverage
+
+Ghost detection engine coverage mapped to MITRE ATT&CK framework techniques.
+
+## Process Injection (T1055)
+
+### T1055.001 - Dynamic-link Library Injection
+- **Detection**: Hook-based injection detection (`hooks.rs`)
+- **Indicators**: 
+  - SetWindowsHookEx API monitoring
+  - Suspicious DLL loading patterns
+  - Global hook chain analysis
+- **Confidence**: High (0.8-0.9)
+
+### T1055.002 - Portable Executable Injection  
+- **Detection**: Shellcode pattern detection (`shellcode.rs`)
+- **Indicators**:
+  - PE headers in private memory regions
+  - Meterpreter payload signatures
+  - High entropy executable regions
+- **Confidence**: High (0.7-0.9)
+
+### T1055.003 - Thread Execution Hijacking
+- **Detection**: Thread analysis (`thread.rs`, `detection.rs`)
+- **Indicators**:
+  - Threads with unusual start addresses
+  - High ratio of recently created threads
+  - Thread count anomalies
+- **Confidence**: Medium (0.5-0.7)
+
+### T1055.004 - Asynchronous Procedure Call
+- **Detection**: Memory pattern analysis
+- **Indicators**:
+  - Suspicious memory layout changes
+  - RWX region proliferation
+  - Thread creation spikes
+- **Confidence**: Medium (0.4-0.6)
+
+### T1055.012 - Process Hollowing
+- **Detection**: Comprehensive hollowing detection (`hollowing.rs`)
+- **Indicators**:
+  - Unmapped main executable image
+  - Suspicious memory gaps (>16MB)
+  - PE header mismatches
+  - Unusual entry point locations
+  - Memory layout anomalies
+- **Confidence**: Very High (0.8-1.0)
+
+## Defense Evasion (TA0005)
+
+### T1027 - Obfuscated Files or Information
+- **Detection**: Entropy analysis in shellcode detector
+- **Indicators**:
+  - High entropy regions (>7.0 Shannon entropy)
+  - Encrypted/packed code patterns
+- **Confidence**: Medium (0.6-0.8)
+
+### T1055 - Process Injection (General)
+- **Detection**: Multi-layered approach across all modules
+- **Indicators**: Combination of all injection-specific indicators
+- **Confidence**: Varies by technique
+
+### T1036 - Masquerading
+- **Detection**: Process metadata analysis
+- **Indicators**:
+  - Process name/path mismatches
+  - Suspicious parent-child relationships
+- **Confidence**: Low-Medium (0.3-0.6)
+
+## Execution (TA0002)
+
+### T1106 - Native API
+- **Detection**: Memory pattern analysis, syscall indicators
+- **Indicators**:
+  - Direct syscall usage patterns
+  - Unusual API call sequences
+- **Confidence**: Medium (0.5-0.7)
+
+### T1055 - Process Injection
+- **Detection**: Primary focus of Ghost detection engine
+- **Coverage**: Comprehensive across all sub-techniques
+
+## Detection Methodology
+
+### Heuristic Analysis
+1. **Memory Layout Analysis**
+   - RWX region detection
+   - Memory gap analysis
+   - Region size anomalies
+
+2. **Behavioral Patterns**
+   - Thread creation patterns
+   - Hook installation monitoring
+   - Process lifecycle anomalies
+
+3. **Signature Matching**
+   - Known shellcode patterns
+   - Malware family signatures
+   - API usage fingerprints
+
+### Confidence Scoring
+- **0.9-1.0**: Very High - Multiple strong indicators
+- **0.7-0.8**: High - Clear malicious patterns
+- **0.5-0.6**: Medium - Suspicious but may be legitimate
+- **0.3-0.4**: Low - Anomalous but likely false positive
+- **0.0-0.2**: Very Low - Minimal suspicious activity
+
+## Coverage Matrix
+
+| Technique | Detection Module | Implementation Status | Test Coverage |
+|-----------|------------------|----------------------|---------------|
+| T1055.001 | hooks.rs | ✅ Complete | ✅ Tested |
+| T1055.002 | shellcode.rs | ✅ Complete | ✅ Tested |
+| T1055.003 | thread.rs | ✅ Complete | ✅ Tested |
+| T1055.004 | detection.rs | ⚠️ Partial | ✅ Tested |
+| T1055.012 | hollowing.rs | ✅ Complete | ✅ Tested |
+| T1027 | shellcode.rs | ✅ Complete | ✅ Tested |
+| T1036 | process.rs | ⚠️ Partial | ❌ Pending |
+| T1106 | detection.rs | ⚠️ Basic | ❌ Pending |
+
+## Future Enhancements
+
+### High Priority
+- **T1055.008** - Ptrace System Calls (Linux)
+- **T1055.009** - Proc Memory (Linux) 
+- **T1055.013** - Process Doppelgänging
+- **T1055.014** - VDSO Hijacking (Linux)
+
+### Medium Priority  
+- **T1134** - Access Token Manipulation
+- **T1548.002** - Bypass User Account Control
+- **T1562.001** - Disable or Modify Tools
+
+### Research Areas
+- Machine learning-based anomaly detection
+- Graph analysis of process relationships
+- Timeline analysis for attack progression
+- Integration with threat intelligence feeds
+
+## References
+
+- [MITRE ATT&CK Framework](https://attack.mitre.org/)
+- [Process Injection Techniques](https://attack.mitre.org/techniques/T1055/)
+- [Windows Process Injection Research](https://www.endgame.com/blog/technical-blog/ten-process-injection-techniques-technical-survey-common-and-trending-process)
+- [Linux Process Injection](https://blog.sektor7.net/#!res/2018/pure-in-memory-linux.md)
+
+---
+
+*Coverage updated: November 2024*  
+*Next review: December 2024*