Implementing Continuous Security Validation With Bas

Control Effectiveness = (Attacks Prevented + Attacks Detected) / Total Attacks Simulated * 100

Example:
  Total simulations:  500
  Prevented (blocked): 350
  Detected (alerted):  100
  Missed (no action):   50

  Prevention Rate: 350/500 = 70%
  Detection Rate:  100/500 = 20%
  Overall Score:   450/500 = 90%
  Gap Rate:         50/500 = 10%

Architecture:
  Management Console (Cloud SaaS):
    - Central orchestration and reporting
    - Attack scenario library management
    - MITRE ATT&CK mapping dashboard

  Simulation Agents:
    - Attacker Agent: Simulates threat actor behavior
    - Target Agent: Receives simulated attacks
    - Network Agent: Tests network-level controls

  Deploy agents across zones:
    - Corporate network (workstations)
    - DMZ (web servers)
    - Data center (critical servers)
    - Cloud environments (AWS/Azure/GCP)
    - Remote/VPN segment

# Example BAS scenario configuration
scenario:
  name: "APT29 (Cozy Bear) Full Kill Chain"
  threat_group: APT29
  mitre_attack_techniques:
    - T1566.001  # Spearphishing Attachment
    - T1059.001  # PowerShell Execution
    - T1547.001  # Registry Run Key Persistence
    - T1003.001  # LSASS Memory Credential Dump
    - T1021.002  # SMB/Windows Admin Shares
    - T1071.001  # Web Protocol C2
    - T1048.003  # DNS Exfiltration

  phases:
    - name: "Initial Access"
      actions:
        - deliver_phishing_payload:
            type: office_macro
            target: email_gateway
            variants: [docm, xlsm, ppam]

    - name: "Execution & Persistence"
      actions:
        - execute_powershell:
            encoded: true
            amsi_bypass: true
        - create_scheduled_task:
            technique: T1053.005

    - name: "Credential Access"
      actions:
        - dump_lsass:
            method: [procdump, comsvcs, nanodump]

    - name: "Lateral Movement"
      actions:
        - psexec_lateral:
            target: internal_server
        - wmi_lateral:
            target: file_server

    - name: "Exfiltration"
      actions:
        - dns_exfiltration:
            data_size: 10MB
            encoding: base64

def map_bas_results_to_controls(simulation_results):
    """Map BAS results to security control effectiveness."""
    control_scores = {}

    control_mapping = {
        "email_gateway": ["T1566.001", "T1566.002", "T1566.003"],
        "edr": ["T1059.001", "T1003.001", "T1055", "T1547.001"],
        "ngfw": ["T1071.001", "T1071.004", "T1048"],
        "siem": ["T1053.005", "T1021.002", "T1087"],
        "dlp": ["T1048.003", "T1567", "T1041"],
        "ndr": ["T1071", "T1021", "T1040"],
    }

    for control, techniques in control_mapping.items():
        relevant = [r for r in simulation_results
                    if r["technique_id"] in techniques]
        if not relevant:
            continue

        prevented = sum(1 for r in relevant if r["result"] == "prevented")
        detected = sum(1 for r in relevant if r["result"] == "detected")
        missed = sum(1 for r in relevant if r["result"] == "missed")
        total = len(relevant)

        control_scores[control] = {
            "total_tests": total,
            "prevented": prevented,
            "detected": detected,
            "missed": missed,
            "prevention_rate": round(prevented / total * 100, 1),
            "detection_rate": round(detected / total * 100, 1),
            "effectiveness": round((prevented + detected) / total * 100, 1),
        }

    return control_scores

Validation Schedule:
  Daily:
    - Malware delivery simulation (email gateway test)
    - C2 communication simulation (firewall/proxy test)
    - Known ransomware behavior simulation (EDR test)

  Weekly:
    - Full kill chain simulation (APT scenario)
    - Lateral movement simulation (network segmentation test)
    - Data exfiltration simulation (DLP test)

  Monthly:
    - Full MITRE ATT&CK coverage assessment
    - New threat group TTP simulation
    - Regression testing after security control changes

  On-Demand:
    - After firewall rule changes
    - After EDR policy updates
    - After new threat intelligence (zero-day response)