add claude client + generic llm client using langchain

.env.example

@@ -7,6 +7,31 @@ NVD_API_KEY=your_nvd_api_key_here
 # Only needs "public_repo" scope for searching public repositories
 GITHUB_TOKEN=your_github_token_here
 
+# LLM API Configuration (Optional - for enhanced SIGMA rule generation)
+# Choose your preferred LLM provider and configure the corresponding API key
+
+# OpenAI Configuration
+# Get your API key at: https://platform.openai.com/api-keys
+OPENAI_API_KEY=your_openai_api_key_here
+
+# Anthropic Configuration  
+# Get your API key at: https://console.anthropic.com/
+ANTHROPIC_API_KEY=your_anthropic_api_key_here
+
+# Ollama Configuration (for local models)
+# Install Ollama locally: https://ollama.ai/
+OLLAMA_BASE_URL=http://localhost:11434
+
+# LLM Provider Selection (optional - auto-detects if not specified)
+# Options: openai, anthropic, ollama
+LLM_PROVIDER=openai
+
+# LLM Model Selection (optional - uses provider default if not specified)
+# OpenAI: gpt-4o, gpt-4o-mini, gpt-4-turbo, gpt-3.5-turbo
+# Anthropic: claude-3-5-sonnet-20241022, claude-3-haiku-20240307, claude-3-opus-20240229
+# Ollama: llama3.2, codellama, mistral, llama2
+LLM_MODEL=gpt-4o-mini
+
 # Database Configuration (Docker Compose will use defaults)
 # DATABASE_URL=postgresql://cve_user:cve_password@localhost:5432/cve_sigma_db
 

backend/claude_client.py

@@ -0,0 +1,221 @@
+"""
+Claude API client for enhanced SIGMA rule generation.
+"""
+import os
+import logging
+from typing import Optional, Dict, Any
+from anthropic import Anthropic
+
+logger = logging.getLogger(__name__)
+
+class ClaudeClient:
+    """Client for interacting with Claude API for SIGMA rule generation."""
+    
+    def __init__(self, api_key: Optional[str] = None):
+        """Initialize Claude client with API key."""
+        self.api_key = api_key or os.getenv('CLAUDE_API_KEY')
+        self.client = None
+        
+        if self.api_key:
+            try:
+                self.client = Anthropic(api_key=self.api_key)
+                logger.info("Claude API client initialized successfully")
+            except Exception as e:
+                logger.error(f"Failed to initialize Claude API client: {e}")
+                self.client = None
+        else:
+            logger.warning("No Claude API key provided. Claude-enhanced rule generation disabled.")
+    
+    def is_available(self) -> bool:
+        """Check if Claude API client is available."""
+        return self.client is not None
+    
+    async def generate_sigma_rule(self, 
+                                 cve_id: str,
+                                 poc_content: str,
+                                 cve_description: str,
+                                 existing_rule: Optional[str] = None) -> Optional[str]:
+        """
+        Generate or enhance a SIGMA rule using Claude API.
+        
+        Args:
+            cve_id: CVE identifier
+            poc_content: Proof-of-concept code content from GitHub
+            cve_description: CVE description from NVD
+            existing_rule: Optional existing SIGMA rule to enhance
+            
+        Returns:
+            Generated SIGMA rule YAML content or None if failed
+        """
+        if not self.is_available():
+            logger.warning("Claude API client not available")
+            return None
+        
+        try:
+            # Construct the prompt for Claude
+            prompt = self._build_sigma_generation_prompt(
+                cve_id, poc_content, cve_description, existing_rule
+            )
+            
+            # Make API call to Claude
+            response = self.client.messages.create(
+                model="claude-3-5-sonnet-20241022",
+                max_tokens=2000,
+                temperature=0.1,
+                messages=[
+                    {
+                        "role": "user",
+                        "content": prompt
+                    }
+                ]
+            )
+            
+            # Extract the SIGMA rule from response
+            sigma_rule = self._extract_sigma_rule(response.content[0].text)
+            
+            logger.info(f"Successfully generated SIGMA rule for {cve_id} using Claude")
+            return sigma_rule
+            
+        except Exception as e:
+            logger.error(f"Failed to generate SIGMA rule for {cve_id} using Claude: {e}")
+            return None
+    
+    def _build_sigma_generation_prompt(self, 
+                                      cve_id: str,
+                                      poc_content: str,
+                                      cve_description: str,
+                                      existing_rule: Optional[str] = None) -> str:
+        """Build the prompt for Claude to generate SIGMA rules."""
+        
+        base_prompt = f"""You are a cybersecurity expert specializing in SIGMA rule creation for threat detection. Your goal is to analyze exploit code from GitHub PoC repositories and create syntactically correct SIGMA rules.
+
+**CVE Information:**
+- CVE ID: {cve_id}
+- Description: {cve_description}
+
+**Proof-of-Concept Code:**
+```
+{poc_content[:4000]}  # Truncate if too long
+```
+
+**Your Task:**
+1. Analyze the exploit code to identify:
+   - Process execution patterns
+   - File system activities
+   - Network connections
+   - Registry modifications
+   - Command line arguments
+   - Suspicious behaviors
+
+2. Create a SIGMA rule that:
+   - Follows proper SIGMA syntax (YAML format)
+   - Includes appropriate detection logic
+   - Has relevant metadata (title, description, author, date, references)
+   - Uses correct field names for the target log source
+   - Includes proper condition logic
+   - Maps to relevant MITRE ATT&CK techniques when applicable
+
+3. Focus on detection patterns that would catch this specific exploit in action
+
+**Important Requirements:**
+- Output ONLY the SIGMA rule in valid YAML format
+- Do not include explanations or comments outside the YAML
+- Use proper SIGMA rule structure with title, id, status, description, references, author, date, logsource, detection, and condition
+- Make the rule specific enough to detect the exploit but not too narrow to miss variants
+- Include relevant tags and MITRE ATT&CK technique mappings"""
+
+        if existing_rule:
+            base_prompt += f"""
+
+**Existing SIGMA Rule (to enhance):**
+```yaml
+{existing_rule}
+```
+
+Please enhance the existing rule with insights from the PoC code analysis."""
+
+        return base_prompt
+    
+    def _extract_sigma_rule(self, response_text: str) -> str:
+        """Extract SIGMA rule YAML from Claude's response."""
+        # Look for YAML content in the response
+        lines = response_text.split('\n')
+        yaml_lines = []
+        in_yaml = False
+        
+        for line in lines:
+            if line.strip().startswith('```yaml') or line.strip().startswith('```'):
+                in_yaml = True
+                continue
+            elif line.strip() == '```' and in_yaml:
+                break
+            elif in_yaml or line.strip().startswith('title:'):
+                yaml_lines.append(line)
+                in_yaml = True
+        
+        if not yaml_lines:
+            # If no YAML block found, return the whole response
+            return response_text.strip()
+        
+        return '\n'.join(yaml_lines).strip()
+    
+    async def enhance_existing_rule(self, 
+                                   existing_rule: str,
+                                   poc_content: str,
+                                   cve_id: str) -> Optional[str]:
+        """
+        Enhance an existing SIGMA rule with PoC analysis.
+        
+        Args:
+            existing_rule: Existing SIGMA rule YAML
+            poc_content: PoC code content
+            cve_id: CVE identifier
+            
+        Returns:
+            Enhanced SIGMA rule or None if failed
+        """
+        if not self.is_available():
+            return None
+        
+        try:
+            prompt = f"""You are a SIGMA rule enhancement expert. Analyze the following PoC code and enhance the existing SIGMA rule with more specific detection patterns.
+
+**CVE ID:** {cve_id}
+
+**PoC Code:**
+```
+{poc_content[:3000]}
+```
+
+**Existing SIGMA Rule:**
+```yaml
+{existing_rule}
+```
+
+**Task:** Enhance the existing rule by:
+1. Adding more specific detection patterns found in the PoC
+2. Improving the condition logic
+3. Adding relevant tags or MITRE ATT&CK mappings
+4. Keeping the rule structure intact but making it more effective
+
+Output ONLY the enhanced SIGMA rule in valid YAML format."""
+
+            response = self.client.messages.create(
+                model="claude-3-5-sonnet-20241022",
+                max_tokens=2000,
+                temperature=0.1,
+                messages=[
+                    {
+                        "role": "user",
+                        "content": prompt
+                    }
+                ]
+            )
+            
+            enhanced_rule = self._extract_sigma_rule(response.content[0].text)
+            logger.info(f"Successfully enhanced SIGMA rule for {cve_id}")
+            return enhanced_rule
+            
+        except Exception as e:
+            logger.error(f"Failed to enhance SIGMA rule for {cve_id}: {e}")
+            return None

backend/enhanced_sigma_generator.py

@@ -9,6 +9,7 @@ from datetime import datetime
 from typing import Dict, List, Optional, Tuple
 from sqlalchemy.orm import Session
 import re
+from llm_client import LLMClient
 
 # Configure logging
 logging.basicConfig(level=logging.INFO)
@@ -17,10 +18,11 @@ logger = logging.getLogger(__name__)
 class EnhancedSigmaGenerator:
     """Enhanced SIGMA rule generator using nomi-sec PoC data"""
     
-    def __init__(self, db_session: Session):
+    def __init__(self, db_session: Session, llm_provider: str = None, llm_model: str = None):
         self.db_session = db_session
+        self.llm_client = LLMClient(provider=llm_provider, model=llm_model)
     
-    async def generate_enhanced_rule(self, cve) -> dict:
+    async def generate_enhanced_rule(self, cve, use_llm: bool = True) -> dict:
         """Generate enhanced SIGMA rule for a CVE using PoC data"""
         from main import SigmaRule, RuleTemplate
         
@@ -33,15 +35,29 @@ class EnhancedSigmaGenerator:
             if poc_data:
                 best_poc = max(poc_data, key=lambda x: x.get('quality_analysis', {}).get('quality_score', 0))
             
-            # Select appropriate template based on PoC analysis
-            template = await self._select_template(cve, best_poc)
+            # Try LLM-enhanced generation first if enabled and available
+            rule_content = None
+            generation_method = "template"
             
-            if not template:
-                logger.warning(f"No suitable template found for {cve.cve_id}")
-                return {'success': False, 'error': 'No suitable template'}
+            if use_llm and self.llm_client.is_available() and best_poc:
+                logger.info(f"Attempting LLM-enhanced rule generation for {cve.cve_id} using {self.llm_client.provider}")
+                rule_content = await self._generate_llm_enhanced_rule(cve, best_poc, poc_data)
+                if rule_content:
+                    generation_method = f"llm_{self.llm_client.provider}"
             
-            # Generate rule content
-            rule_content = await self._generate_rule_content(cve, template, poc_data)
+            # Fallback to template-based generation
+            if not rule_content:
+                logger.info(f"Using template-based rule generation for {cve.cve_id}")
+                
+                # Select appropriate template based on PoC analysis
+                template = await self._select_template(cve, best_poc)
+                
+                if not template:
+                    logger.warning(f"No suitable template found for {cve.cve_id}")
+                    return {'success': False, 'error': 'No suitable template'}
+                
+                # Generate rule content
+                rule_content = await self._generate_rule_content(cve, template, poc_data)
             
             # Calculate confidence level
             confidence_level = self._calculate_confidence_level(cve, poc_data)
@@ -55,8 +71,8 @@ class EnhancedSigmaGenerator:
                 'cve_id': cve.cve_id,
                 'rule_name': f"{cve.cve_id} Enhanced Detection",
                 'rule_content': rule_content,
-                'detection_type': template.template_name,
-                'log_source': self._extract_log_source(template.template_name),
+                'detection_type': f"{generation_method}_generated",
+                'log_source': self._extract_log_source_from_content(rule_content),
                 'confidence_level': confidence_level,
                 'auto_generated': True,
                 'exploit_based': len(poc_data) > 0,
@@ -67,7 +83,8 @@ class EnhancedSigmaGenerator:
                     'best_poc_quality': best_poc.get('quality_analysis', {}).get('quality_score', 0) if best_poc else 0,
                     'total_stars': sum(p.get('stargazers_count', 0) for p in poc_data),
                     'avg_stars': sum(p.get('stargazers_count', 0) for p in poc_data) / len(poc_data) if poc_data else 0,
-                    'source': getattr(cve, 'poc_source', 'nomi_sec')
+                    'source': getattr(cve, 'poc_source', 'nomi_sec'),
+                    'generation_method': generation_method
                 },
                 'github_repos': [p.get('html_url', '') for p in poc_data],
                 'exploit_indicators': json.dumps(self._combine_exploit_indicators(poc_data)),
@@ -100,6 +117,135 @@ class EnhancedSigmaGenerator:
             logger.error(f"Error generating enhanced rule for {cve.cve_id}: {e}")
             return {'success': False, 'error': str(e)}
     
+    async def _generate_llm_enhanced_rule(self, cve, best_poc: dict, poc_data: list) -> Optional[str]:
+        """Generate SIGMA rule using LLM API with PoC analysis"""
+        try:
+            # Get PoC content from the best quality PoC
+            poc_content = await self._extract_poc_content(best_poc)
+            if not poc_content:
+                logger.warning(f"No PoC content available for {cve.cve_id}")
+                return None
+            
+            # Generate rule using LLM
+            rule_content = await self.llm_client.generate_sigma_rule(
+                cve_id=cve.cve_id,
+                poc_content=poc_content,
+                cve_description=cve.description or "",
+                existing_rule=None
+            )
+            
+            if rule_content:
+                # Validate the generated rule
+                if self.llm_client.validate_sigma_rule(rule_content):
+                    logger.info(f"Successfully generated LLM-enhanced rule for {cve.cve_id}")
+                    return rule_content
+                else:
+                    logger.warning(f"Generated rule for {cve.cve_id} failed validation")
+                    return None
+            
+            return None
+            
+        except Exception as e:
+            logger.error(f"Error generating LLM-enhanced rule for {cve.cve_id}: {e}")
+            return None
+    
+    async def _extract_poc_content(self, poc: dict) -> Optional[str]:
+        """Extract actual code content from PoC repository"""
+        try:
+            import aiohttp
+            import asyncio
+            
+            # Get repository information
+            repo_url = poc.get('html_url', '')
+            if not repo_url:
+                return None
+            
+            # Convert GitHub URL to API URL for repository content
+            if 'github.com' in repo_url:
+                # Extract owner and repo from URL
+                parts = repo_url.rstrip('/').split('/')
+                if len(parts) >= 2:
+                    owner = parts[-2]
+                    repo = parts[-1]
+                    
+                    # Get repository files via GitHub API
+                    api_url = f"https://api.github.com/repos/{owner}/{repo}/contents"
+                    
+                    async with aiohttp.ClientSession() as session:
+                        # Add timeout to prevent hanging
+                        timeout = aiohttp.ClientTimeout(total=30)
+                        async with session.get(api_url, timeout=timeout) as response:
+                            if response.status == 200:
+                                contents = await response.json()
+                                
+                                # Look for common exploit files
+                                target_files = [
+                                    'exploit.py', 'poc.py', 'exploit.c', 'exploit.cpp',
+                                    'exploit.java', 'exploit.rb', 'exploit.php',
+                                    'exploit.js', 'exploit.sh', 'exploit.ps1',
+                                    'README.md', 'main.py', 'index.js'
+                                ]
+                                
+                                for file_info in contents:
+                                    if file_info.get('type') == 'file':
+                                        filename = file_info.get('name', '').lower()
+                                        
+                                        # Check if this is a target file
+                                        if any(target in filename for target in target_files):
+                                            file_url = file_info.get('download_url')
+                                            if file_url:
+                                                async with session.get(file_url, timeout=timeout) as file_response:
+                                                    if file_response.status == 200:
+                                                        content = await file_response.text()
+                                                        # Limit content size
+                                                        if len(content) > 10000:
+                                                            content = content[:10000] + "\n... [content truncated]"
+                                                        return content
+                                
+                                # If no specific exploit file found, return description/README
+                                for file_info in contents:
+                                    if file_info.get('type') == 'file':
+                                        filename = file_info.get('name', '').lower()
+                                        if 'readme' in filename:
+                                            file_url = file_info.get('download_url')
+                                            if file_url:
+                                                async with session.get(file_url, timeout=timeout) as file_response:
+                                                    if file_response.status == 200:
+                                                        content = await file_response.text()
+                                                        return content[:5000]  # Smaller limit for README
+            
+            # Fallback to description and metadata
+            description = poc.get('description', '')
+            if description:
+                return f"Repository Description: {description}"
+            
+            return None
+            
+        except Exception as e:
+            logger.error(f"Error extracting PoC content: {e}")
+            return None
+    
+    
+    def _extract_log_source_from_content(self, rule_content: str) -> str:
+        """Extract log source from the generated rule content"""
+        try:
+            import yaml
+            parsed = yaml.safe_load(rule_content)
+            logsource = parsed.get('logsource', {})
+            
+            category = logsource.get('category', '')
+            product = logsource.get('product', '')
+            
+            if category:
+                return category
+            elif product:
+                return product
+            else:
+                return 'generic'
+                
+        except Exception:
+            return 'generic'
+    
     async def _select_template(self, cve, best_poc: Optional[dict]) -> Optional[object]:
         """Select the most appropriate template based on CVE and PoC analysis"""
         from main import RuleTemplate

backend/llm_client.py

@@ -0,0 +1,398 @@
+"""
+LangChain-based LLM client for enhanced SIGMA rule generation.
+Supports multiple LLM providers: OpenAI, Anthropic, and local models.
+"""
+import os
+import logging
+from typing import Optional, Dict, Any, List
+from langchain_core.messages import HumanMessage, SystemMessage
+from langchain_core.prompts import ChatPromptTemplate
+from langchain_openai import ChatOpenAI
+from langchain_anthropic import ChatAnthropic
+from langchain_community.llms import Ollama
+from langchain_core.output_parsers import StrOutputParser
+import yaml
+
+logger = logging.getLogger(__name__)
+
+class LLMClient:
+    """Multi-provider LLM client for SIGMA rule generation using LangChain."""
+    
+    SUPPORTED_PROVIDERS = {
+        'openai': {
+            'models': ['gpt-4o', 'gpt-4o-mini', 'gpt-4-turbo', 'gpt-3.5-turbo'],
+            'env_key': 'OPENAI_API_KEY',
+            'default_model': 'gpt-4o-mini'
+        },
+        'anthropic': {
+            'models': ['claude-3-5-sonnet-20241022', 'claude-3-haiku-20240307', 'claude-3-opus-20240229'],
+            'env_key': 'ANTHROPIC_API_KEY',
+            'default_model': 'claude-3-5-sonnet-20241022'
+        },
+        'ollama': {
+            'models': ['llama3.2', 'codellama', 'mistral', 'llama2'],
+            'env_key': 'OLLAMA_BASE_URL',
+            'default_model': 'llama3.2'
+        }
+    }
+    
+    def __init__(self, provider: str = None, model: str = None):
+        """Initialize LLM client with specified provider and model."""
+        self.provider = provider or self._detect_provider()
+        self.model = model or self._get_default_model(self.provider)
+        self.llm = None
+        self.output_parser = StrOutputParser()
+        
+        self._initialize_llm()
+    
+    def _detect_provider(self) -> str:
+        """Auto-detect available LLM provider based on environment variables."""
+        # Check for API keys in order of preference
+        if os.getenv('ANTHROPIC_API_KEY'):
+            return 'anthropic'
+        elif os.getenv('OPENAI_API_KEY'):
+            return 'openai'
+        elif os.getenv('OLLAMA_BASE_URL'):
+            return 'ollama'
+        else:
+            # Default to OpenAI if no keys found
+            return 'openai'
+    
+    def _get_default_model(self, provider: str) -> str:
+        """Get default model for the specified provider."""
+        return self.SUPPORTED_PROVIDERS.get(provider, {}).get('default_model', 'gpt-4o-mini')
+    
+    def _initialize_llm(self):
+        """Initialize the LLM based on provider and model."""
+        try:
+            if self.provider == 'openai':
+                api_key = os.getenv('OPENAI_API_KEY')
+                if not api_key:
+                    logger.warning("OpenAI API key not found")
+                    return
+                
+                self.llm = ChatOpenAI(
+                    model=self.model,
+                    api_key=api_key,
+                    temperature=0.1,
+                    max_tokens=2000
+                )
+                
+            elif self.provider == 'anthropic':
+                api_key = os.getenv('ANTHROPIC_API_KEY')
+                if not api_key:
+                    logger.warning("Anthropic API key not found")
+                    return
+                
+                self.llm = ChatAnthropic(
+                    model=self.model,
+                    api_key=api_key,
+                    temperature=0.1,
+                    max_tokens=2000
+                )
+                
+            elif self.provider == 'ollama':
+                base_url = os.getenv('OLLAMA_BASE_URL', 'http://localhost:11434')
+                
+                self.llm = Ollama(
+                    model=self.model,
+                    base_url=base_url,
+                    temperature=0.1
+                )
+            
+            if self.llm:
+                logger.info(f"LLM client initialized: {self.provider} with model {self.model}")
+            else:
+                logger.error(f"Failed to initialize LLM client for provider: {self.provider}")
+                
+        except Exception as e:
+            logger.error(f"Error initializing LLM client: {e}")
+            self.llm = None
+    
+    def is_available(self) -> bool:
+        """Check if LLM client is available and configured."""
+        return self.llm is not None
+    
+    def get_provider_info(self) -> Dict[str, Any]:
+        """Get information about the current provider and configuration."""
+        provider_info = self.SUPPORTED_PROVIDERS.get(self.provider, {})
+        return {
+            'provider': self.provider,
+            'model': self.model,
+            'available': self.is_available(),
+            'supported_models': provider_info.get('models', []),
+            'env_key': provider_info.get('env_key', ''),
+            'api_key_configured': bool(os.getenv(provider_info.get('env_key', '')))
+        }
+    
+    async def generate_sigma_rule(self, 
+                                 cve_id: str,
+                                 poc_content: str,
+                                 cve_description: str,
+                                 existing_rule: Optional[str] = None) -> Optional[str]:
+        """
+        Generate or enhance a SIGMA rule using the configured LLM.
+        
+        Args:
+            cve_id: CVE identifier
+            poc_content: Proof-of-concept code content from GitHub
+            cve_description: CVE description from NVD
+            existing_rule: Optional existing SIGMA rule to enhance
+            
+        Returns:
+            Generated SIGMA rule YAML content or None if failed
+        """
+        if not self.is_available():
+            logger.warning("LLM client not available")
+            return None
+        
+        try:
+            # Create the prompt template
+            prompt = self._build_sigma_generation_prompt(
+                cve_id, poc_content, cve_description, existing_rule
+            )
+            
+            # Create the chain
+            chain = prompt | self.llm | self.output_parser
+            
+            # Generate the response
+            response = await chain.ainvoke({
+                "cve_id": cve_id,
+                "poc_content": poc_content[:4000],  # Truncate if too long
+                "cve_description": cve_description,
+                "existing_rule": existing_rule or "None"
+            })
+            
+            # Extract the SIGMA rule from response
+            sigma_rule = self._extract_sigma_rule(response)
+            
+            logger.info(f"Successfully generated SIGMA rule for {cve_id} using {self.provider}")
+            return sigma_rule
+            
+        except Exception as e:
+            logger.error(f"Failed to generate SIGMA rule for {cve_id} using {self.provider}: {e}")
+            return None
+    
+    def _build_sigma_generation_prompt(self, 
+                                      cve_id: str,
+                                      poc_content: str,
+                                      cve_description: str,
+                                      existing_rule: Optional[str] = None) -> ChatPromptTemplate:
+        """Build the prompt template for SIGMA rule generation."""
+        
+        system_message = """You are a cybersecurity expert specializing in SIGMA rule creation for threat detection. Your goal is to analyze exploit code from GitHub PoC repositories and create syntactically correct SIGMA rules.
+
+**Your Task:**
+1. Analyze the exploit code to identify:
+   - Process execution patterns
+   - File system activities
+   - Network connections
+   - Registry modifications
+   - Command line arguments
+   - Suspicious behaviors
+
+2. Create a SIGMA rule that:
+   - Follows proper SIGMA syntax (YAML format)
+   - Includes appropriate detection logic
+   - Has relevant metadata (title, description, author, date, references)
+   - Uses correct field names for the target log source
+   - Includes proper condition logic
+   - Maps to relevant MITRE ATT&CK techniques when applicable
+
+3. Focus on detection patterns that would catch this specific exploit in action
+
+**Important Requirements:**
+- Output ONLY the SIGMA rule in valid YAML format
+- Do not include explanations or comments outside the YAML
+- Use proper SIGMA rule structure with title, id, status, description, references, author, date, logsource, detection, and condition
+- Make the rule specific enough to detect the exploit but not too narrow to miss variants
+- Include relevant tags and MITRE ATT&CK technique mappings"""
+
+        if existing_rule:
+            user_template = """**CVE Information:**
+- CVE ID: {cve_id}
+- Description: {cve_description}
+
+**Proof-of-Concept Code:**
+```
+{poc_content}
+```
+
+**Existing SIGMA Rule (to enhance):**
+```yaml
+{existing_rule}
+```
+
+Please enhance the existing rule with insights from the PoC code analysis."""
+        else:
+            user_template = """**CVE Information:**
+- CVE ID: {cve_id}
+- Description: {cve_description}
+
+**Proof-of-Concept Code:**
+```
+{poc_content}
+```
+
+Please create a new SIGMA rule based on the PoC code analysis."""
+        
+        return ChatPromptTemplate.from_messages([
+            SystemMessage(content=system_message),
+            HumanMessage(content=user_template)
+        ])
+    
+    def _extract_sigma_rule(self, response_text: str) -> str:
+        """Extract SIGMA rule YAML from LLM response."""
+        # Look for YAML content in the response
+        lines = response_text.split('\n')
+        yaml_lines = []
+        in_yaml = False
+        
+        for line in lines:
+            if line.strip().startswith('```yaml') or line.strip().startswith('```'):
+                in_yaml = True
+                continue
+            elif line.strip() == '```' and in_yaml:
+                break
+            elif in_yaml or line.strip().startswith('title:'):
+                yaml_lines.append(line)
+                in_yaml = True
+        
+        if not yaml_lines:
+            # If no YAML block found, return the whole response
+            return response_text.strip()
+        
+        return '\n'.join(yaml_lines).strip()
+    
+    async def enhance_existing_rule(self, 
+                                   existing_rule: str,
+                                   poc_content: str,
+                                   cve_id: str) -> Optional[str]:
+        """
+        Enhance an existing SIGMA rule with PoC analysis.
+        
+        Args:
+            existing_rule: Existing SIGMA rule YAML
+            poc_content: PoC code content
+            cve_id: CVE identifier
+            
+        Returns:
+            Enhanced SIGMA rule or None if failed
+        """
+        if not self.is_available():
+            return None
+        
+        try:
+            system_message = """You are a SIGMA rule enhancement expert. Analyze the following PoC code and enhance the existing SIGMA rule with more specific detection patterns.
+
+**Task:** Enhance the existing rule by:
+1. Adding more specific detection patterns found in the PoC
+2. Improving the condition logic
+3. Adding relevant tags or MITRE ATT&CK mappings
+4. Keeping the rule structure intact but making it more effective
+
+Output ONLY the enhanced SIGMA rule in valid YAML format."""
+
+            user_template = """**CVE ID:** {cve_id}
+
+**PoC Code:**
+```
+{poc_content}
+```
+
+**Existing SIGMA Rule:**
+```yaml
+{existing_rule}
+```"""
+
+            prompt = ChatPromptTemplate.from_messages([
+                SystemMessage(content=system_message),
+                HumanMessage(content=user_template)
+            ])
+            
+            chain = prompt | self.llm | self.output_parser
+            
+            response = await chain.ainvoke({
+                "cve_id": cve_id,
+                "poc_content": poc_content[:3000],
+                "existing_rule": existing_rule
+            })
+            
+            enhanced_rule = self._extract_sigma_rule(response)
+            logger.info(f"Successfully enhanced SIGMA rule for {cve_id}")
+            return enhanced_rule
+            
+        except Exception as e:
+            logger.error(f"Failed to enhance SIGMA rule for {cve_id}: {e}")
+            return None
+    
+    def validate_sigma_rule(self, rule_content: str) -> bool:
+        """Validate that the generated rule is syntactically correct SIGMA."""
+        try:
+            # Parse as YAML
+            parsed = yaml.safe_load(rule_content)
+            
+            # Check required fields
+            required_fields = ['title', 'id', 'description', 'logsource', 'detection']
+            for field in required_fields:
+                if field not in parsed:
+                    logger.warning(f"Missing required field: {field}")
+                    return False
+            
+            # Check detection structure
+            detection = parsed.get('detection', {})
+            if not isinstance(detection, dict):
+                logger.warning("Detection field must be a dictionary")
+                return False
+            
+            # Should have at least one selection and a condition
+            if 'condition' not in detection:
+                logger.warning("Detection must have a condition")
+                return False
+            
+            # Check logsource structure
+            logsource = parsed.get('logsource', {})
+            if not isinstance(logsource, dict):
+                logger.warning("Logsource field must be a dictionary")
+                return False
+            
+            logger.info("SIGMA rule validation passed")
+            return True
+            
+        except yaml.YAMLError as e:
+            logger.warning(f"YAML parsing error: {e}")
+            return False
+        except Exception as e:
+            logger.warning(f"Rule validation error: {e}")
+            return False
+    
+    @classmethod
+    def get_available_providers(cls) -> List[Dict[str, Any]]:
+        """Get list of available LLM providers and their configuration status."""
+        providers = []
+        
+        for provider_name, provider_info in cls.SUPPORTED_PROVIDERS.items():
+            env_key = provider_info.get('env_key', '')
+            api_key_configured = bool(os.getenv(env_key))
+            
+            providers.append({
+                'name': provider_name,
+                'models': provider_info.get('models', []),
+                'default_model': provider_info.get('default_model', ''),
+                'env_key': env_key,
+                'api_key_configured': api_key_configured,
+                'available': api_key_configured or provider_name == 'ollama'
+            })
+        
+        return providers
+    
+    def switch_provider(self, provider: str, model: str = None):
+        """Switch to a different LLM provider and model."""
+        if provider not in self.SUPPORTED_PROVIDERS:
+            raise ValueError(f"Unsupported provider: {provider}")
+        
+        self.provider = provider
+        self.model = model or self._get_default_model(provider)
+        self._initialize_llm()
+        
+        logger.info(f"Switched to provider: {provider} with model: {self.model}")

backend/main.py

@@ -1414,6 +1414,171 @@ async def regenerate_sigma_rules(background_tasks: BackgroundTasks,
         "force": request.force
     }
 
+@app.post("/api/llm-enhanced-rules")
+async def generate_llm_enhanced_rules(request: dict, background_tasks: BackgroundTasks, db: Session = Depends(get_db)):
+    """Generate SIGMA rules using LLM API for enhanced analysis"""
+    
+    # Parse request parameters
+    cve_id = request.get('cve_id')
+    force = request.get('force', False)
+    llm_provider = request.get('provider', os.getenv('LLM_PROVIDER'))
+    llm_model = request.get('model', os.getenv('LLM_MODEL'))
+    
+    # Validation
+    if cve_id and not re.match(r'^CVE-\d{4}-\d{4,}$', cve_id):
+        raise HTTPException(status_code=400, detail="Invalid CVE ID format")
+    
+    async def llm_generation_task():
+        """Background task for LLM-enhanced rule generation"""
+        try:
+            from enhanced_sigma_generator import EnhancedSigmaGenerator
+            
+            generator = EnhancedSigmaGenerator(db, llm_provider, llm_model)
+            
+            # Process specific CVE or all CVEs with PoC data
+            if cve_id:
+                cve = db.query(CVE).filter(CVE.cve_id == cve_id).first()
+                if not cve:
+                    logger.error(f"CVE {cve_id} not found")
+                    return
+                
+                cves_to_process = [cve]
+            else:
+                # Process CVEs with PoC data that either have no rules or force update
+                query = db.query(CVE).filter(CVE.poc_count > 0)
+                
+                if not force:
+                    # Only process CVEs without existing LLM-generated rules
+                    existing_llm_rules = db.query(SigmaRule).filter(
+                        SigmaRule.detection_type.like('llm_%')
+                    ).all()
+                    existing_cve_ids = {rule.cve_id for rule in existing_llm_rules}
+                    cves_to_process = [cve for cve in query.all() if cve.cve_id not in existing_cve_ids]
+                else:
+                    cves_to_process = query.all()
+            
+            logger.info(f"Processing {len(cves_to_process)} CVEs for LLM-enhanced rule generation using {llm_provider}")
+            
+            rules_generated = 0
+            rules_updated = 0
+            failures = 0
+            
+            for cve in cves_to_process:
+                try:
+                    # Check if CVE has sufficient PoC data
+                    if not cve.poc_data or not cve.poc_count:
+                        logger.debug(f"Skipping {cve.cve_id} - no PoC data")
+                        continue
+                    
+                    # Generate LLM-enhanced rule
+                    result = await generator.generate_enhanced_rule(cve, use_llm=True)
+                    
+                    if result.get('success'):
+                        if result.get('updated'):
+                            rules_updated += 1
+                        else:
+                            rules_generated += 1
+                        
+                        logger.info(f"Successfully generated LLM-enhanced rule for {cve.cve_id}")
+                    else:
+                        failures += 1
+                        logger.warning(f"Failed to generate LLM-enhanced rule for {cve.cve_id}: {result.get('error')}")
+                
+                except Exception as e:
+                    failures += 1
+                    logger.error(f"Error generating LLM-enhanced rule for {cve.cve_id}: {e}")
+                    continue
+            
+            logger.info(f"LLM-enhanced rule generation completed: {rules_generated} new, {rules_updated} updated, {failures} failures")
+            
+        except Exception as e:
+            logger.error(f"LLM-enhanced rule generation failed: {e}")
+            import traceback
+            traceback.print_exc()
+    
+    background_tasks.add_task(llm_generation_task)
+    
+    return {
+        "message": "LLM-enhanced SIGMA rule generation started",
+        "status": "started",
+        "cve_id": cve_id,
+        "force": force,
+        "provider": llm_provider,
+        "model": llm_model,
+        "note": "Requires appropriate LLM API key to be set"
+    }
+
+@app.get("/api/llm-status")
+async def get_llm_status():
+    """Check LLM API availability status"""
+    try:
+        from llm_client import LLMClient
+        
+        # Get current provider configuration
+        provider = os.getenv('LLM_PROVIDER')
+        model = os.getenv('LLM_MODEL')
+        
+        client = LLMClient(provider=provider, model=model)
+        provider_info = client.get_provider_info()
+        
+        # Get all available providers
+        all_providers = LLMClient.get_available_providers()
+        
+        return {
+            "current_provider": provider_info,
+            "available_providers": all_providers,
+            "status": "ready" if client.is_available() else "unavailable"
+        }
+    except Exception as e:
+        logger.error(f"Error checking LLM status: {e}")
+        return {
+            "current_provider": {"provider": "unknown", "available": False},
+            "available_providers": [],
+            "status": "error",
+            "error": str(e)
+        }
+
+@app.post("/api/llm-switch")
+async def switch_llm_provider(request: dict):
+    """Switch LLM provider and model"""
+    try:
+        from llm_client import LLMClient
+        
+        provider = request.get('provider')
+        model = request.get('model')
+        
+        if not provider:
+            raise HTTPException(status_code=400, detail="Provider is required")
+        
+        # Validate provider
+        if provider not in LLMClient.SUPPORTED_PROVIDERS:
+            raise HTTPException(status_code=400, detail=f"Unsupported provider: {provider}")
+        
+        # Test the new configuration
+        client = LLMClient(provider=provider, model=model)
+        
+        if not client.is_available():
+            raise HTTPException(status_code=400, detail=f"Provider {provider} is not available or not configured")
+        
+        # Update environment variables (note: this only affects the current session)
+        os.environ['LLM_PROVIDER'] = provider
+        if model:
+            os.environ['LLM_MODEL'] = model
+        
+        provider_info = client.get_provider_info()
+        
+        return {
+            "message": f"Switched to {provider}",
+            "provider_info": provider_info,
+            "status": "success"
+        }
+        
+    except HTTPException:
+        raise
+    except Exception as e:
+        logger.error(f"Error switching LLM provider: {e}")
+        raise HTTPException(status_code=500, detail=str(e))
+
 @app.post("/api/cancel-job/{job_id}")
 async def cancel_job(job_id: str, db: Session = Depends(get_db)):
     """Cancel a running job"""

backend/requirements.txt

@@ -15,3 +15,10 @@ lxml==4.9.3
 aiohttp==3.9.1
 aiofiles
 pyyaml==6.0.1
+langchain==0.2.0
+langchain-openai==0.1.17
+langchain-anthropic==0.1.15
+langchain-community==0.2.0
+langchain-core>=0.2.20
+openai>=1.32.0
+anthropic==0.40.0

frontend/src/App.js

@@ -21,6 +21,7 @@ function App() {
   const [gitHubPocStats, setGitHubPocStats] = useState({});
   const [bulkProcessing, setBulkProcessing] = useState(false);
   const [hasRunningJobs, setHasRunningJobs] = useState(false);
+  const [llmStatus, setLlmStatus] = useState({});
 
   useEffect(() => {
     fetchData();
@@ -29,14 +30,15 @@ function App() {
   const fetchData = async () => {
     try {
       setLoading(true);
-      const [cvesRes, rulesRes, statsRes, bulkJobsRes, bulkStatusRes, pocStatsRes, githubPocStatsRes] = await Promise.all([
+      const [cvesRes, rulesRes, statsRes, bulkJobsRes, bulkStatusRes, pocStatsRes, githubPocStatsRes, llmStatusRes] = await Promise.all([
         axios.get(`${API_BASE_URL}/api/cves`),
         axios.get(`${API_BASE_URL}/api/sigma-rules`),
         axios.get(`${API_BASE_URL}/api/stats`),
         axios.get(`${API_BASE_URL}/api/bulk-jobs`),
         axios.get(`${API_BASE_URL}/api/bulk-status`),
         axios.get(`${API_BASE_URL}/api/poc-stats`),
-        axios.get(`${API_BASE_URL}/api/github-poc-stats`).catch(err => ({ data: {} }))
+        axios.get(`${API_BASE_URL}/api/github-poc-stats`).catch(err => ({ data: {} })),
+        axios.get(`${API_BASE_URL}/api/llm-status`).catch(err => ({ data: {} }))
       ]);
       
       setCves(cvesRes.data);
@@ -46,6 +48,7 @@ function App() {
       setBulkStatus(bulkStatusRes.data);
       setPocStats(pocStatsRes.data);
       setGitHubPocStats(githubPocStatsRes.data);
+      setLlmStatus(llmStatusRes.data);
       
       // Update running jobs state
       const runningJobs = bulkJobsRes.data.filter(job => job.status === 'running' || job.status === 'pending');
@@ -166,6 +169,32 @@ function App() {
     }
   };
 
+  const generateLlmRules = async (force = false) => {
+    try {
+      const response = await axios.post(`${API_BASE_URL}/api/llm-enhanced-rules`, {
+        force: force
+      });
+      console.log('LLM rule generation response:', response.data);
+      fetchData();
+    } catch (error) {
+      console.error('Error generating LLM-enhanced rules:', error);
+    }
+  };
+
+  const switchLlmProvider = async (provider, model) => {
+    try {
+      const response = await axios.post(`${API_BASE_URL}/api/llm-switch`, {
+        provider: provider,
+        model: model
+      });
+      console.log('LLM provider switch response:', response.data);
+      fetchData(); // Refresh to get updated status
+    } catch (error) {
+      console.error('Error switching LLM provider:', error);
+      alert('Failed to switch LLM provider. Please check configuration.');
+    }
+  };
+
   const getSeverityColor = (severity) => {
     switch (severity?.toLowerCase()) {
       case 'critical': return 'bg-red-100 text-red-800';
@@ -197,6 +226,9 @@ function App() {
           <p className="text-3xl font-bold text-green-600">{stats.total_sigma_rules || 0}</p>
           <p className="text-sm text-gray-500">Nomi-sec: {stats.nomi_sec_rules || 0}</p>
           <p className="text-sm text-gray-500">GitHub PoCs: {gitHubPocStats.github_poc_rules || 0}</p>
+          <p className={`text-sm ${llmStatus.status === 'ready' ? 'text-green-600' : 'text-red-500'}`}>
+            LLM: {llmStatus.current_provider?.provider || 'Not Available'}
+          </p>
         </div>
         <div className="bg-white p-6 rounded-lg shadow">
           <h3 className="text-lg font-medium text-gray-900">CVEs with PoCs</h3>
@@ -219,7 +251,7 @@ function App() {
       {/* Bulk Processing Controls */}
       <div className="bg-white rounded-lg shadow p-6">
         <h2 className="text-xl font-bold text-gray-900 mb-4">Bulk Processing</h2>
-        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4">
+        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-5 gap-4">
           <button
             onClick={() => startBulkSeed(2002)}
             disabled={hasRunningJobs}
@@ -275,6 +307,64 @@ function App() {
           >
             {hasRunningJobs ? 'Processing...' : 'Regenerate Rules'}
           </button>
+          <button
+            onClick={() => generateLlmRules()}
+            disabled={hasRunningJobs || llmStatus.status !== 'ready'}
+            className={`px-4 py-2 rounded-md text-white ${
+              hasRunningJobs || llmStatus.status !== 'ready'
+                ? 'bg-gray-400 cursor-not-allowed' 
+                : 'bg-violet-600 hover:bg-violet-700'
+            }`}
+            title={llmStatus.status !== 'ready' ? 'LLM not configured' : ''}
+          >
+            {hasRunningJobs ? 'Processing...' : 'Generate LLM Rules'}
+          </button>
+        </div>
+      </div>
+
+      {/* LLM Configuration */}
+      <div className="bg-white rounded-lg shadow p-6">
+        <h2 className="text-xl font-bold text-gray-900 mb-4">LLM Configuration</h2>
+        <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
+          <div>
+            <h3 className="text-lg font-medium text-gray-900 mb-2">Current Provider</h3>
+            <div className="space-y-2">
+              <p className="text-sm text-gray-600">
+                Provider: <span className="font-medium">{llmStatus.current_provider?.provider || 'Not configured'}</span>
+              </p>
+              <p className="text-sm text-gray-600">
+                Model: <span className="font-medium">{llmStatus.current_provider?.model || 'Not configured'}</span>
+              </p>
+              <p className={`text-sm ${llmStatus.status === 'ready' ? 'text-green-600' : 'text-red-500'}`}>
+                Status: <span className="font-medium">{llmStatus.status || 'Unknown'}</span>
+              </p>
+            </div>
+          </div>
+          <div>
+            <h3 className="text-lg font-medium text-gray-900 mb-2">Available Providers</h3>
+            <div className="space-y-2">
+              {llmStatus.available_providers?.map(provider => (
+                <div key={provider.name} className="flex items-center justify-between p-2 bg-gray-50 rounded">
+                  <div>
+                    <span className="font-medium">{provider.name}</span>
+                    <span className={`ml-2 text-xs px-2 py-1 rounded ${
+                      provider.available ? 'bg-green-100 text-green-800' : 'bg-red-100 text-red-800'
+                    }`}>
+                      {provider.available ? 'Available' : 'Not configured'}
+                    </span>
+                  </div>
+                  {provider.available && provider.name !== llmStatus.current_provider?.provider && (
+                    <button
+                      onClick={() => switchLlmProvider(provider.name, provider.default_model)}
+                      className="text-xs bg-blue-600 hover:bg-blue-700 text-white px-2 py-1 rounded"
+                    >
+                      Switch
+                    </button>
+                  )}
+                </div>
+              ))}
+            </div>
+          </div>
         </div>
       </div>