# WIA-SEC-022: Ransomware Protection Standard
## PHASE 1 - CORE SPECIFICATION

**Standard ID:** WIA-SEC-022
**Title:** Ransomware Protection and Recovery Systems
**Version:** 1.0.0
**Status:** Active
**Last Updated:** 2025-12-25

---

## 1. Introduction

### 1.1 Purpose
This specification defines comprehensive international standards for ransomware protection, detection, and recovery. It establishes protocols for preventive measures, behavioral detection, automated response, and business continuity planning to defend against ransomware attacks.

### 1.2 Scope
This standard covers:
- Immutable backup strategies and storage architectures
- Endpoint protection and behavioral monitoring
- Real-time threat detection and response automation
- Recovery orchestration and business continuity
- Integration with SIEM, EDR, and security orchestration platforms
- Compliance with data protection regulations

### 1.3 Philosophy
**弘益人間 (Benefit All Humanity)** - This standard aims to protect organizations and individuals from the devastating impact of ransomware attacks through comprehensive, layered defense mechanisms and rapid recovery capabilities.

---

## 2. Core Components

### 2.1 Immutable Backup Architecture

The foundation of ransomware protection is ensuring that clean, unencrypted copies of data always exist and cannot be compromised by attackers.

#### 2.1.1 WORM Storage (Write-Once-Read-Many)
- **Immutability Guarantee**: Once written, backup data cannot be modified or deleted within retention period
- **Storage Types**:
  - Object storage with object lock (S3 Object Lock, Azure Immutable Blobs)
  - Tape archives with physical write protection
  - Dedicated backup appliances with firmware-enforced WORM
- **Retention Policies**: Configurable from 7 days to 7 years based on compliance requirements
- **Compliance**: Meets SEC Rule 17a-4(f), FINRA, HIPAA retention requirements

**Example Configuration:**
```json
{
  "backup": {
    "storage": {
      "type": "WORM",
      "provider": "S3-Object-Lock",
      "retention": {
        "mode": "COMPLIANCE",
        "days": 90
      },
      "immutability": {
        "enabled": true,
        "deletionProtection": true
      }
    }
  }
}
```

#### 2.1.2 Air-Gapped Backups
- **Physical Isolation**: Backup media disconnected from network after completion
- **Implementation**:
  - Removable storage media (RDX, LTO tape) physically removed
  - Network-attached storage with scheduled air-gap windows
  - Automated mount/unmount cycles
- **Rotation Strategy**: 3-2-1-1-0 rule
  - **3** copies of data
  - **2** different media types
  - **1** copy offsite
  - **1** copy offline/air-gapped
  - **0** errors in restoration testing

#### 2.1.3 Backup Encryption
- **Encryption Standards**:
  - **AES-256-GCM**: Primary encryption algorithm for data at rest
  - **ChaCha20-Poly1305**: Alternative for high-performance scenarios
  - **Key Management**: Hardware Security Module (HSM) or cloud KMS integration
- **Key Rotation**: Automatic rotation every 90 days
- **Recovery Key**: Secure offline storage of master recovery keys in multiple physical locations

**Encryption Workflow:**
```
1. Data Collection → 2. Compression (zstd/lz4) → 3. Encryption (AES-256-GCM)
→ 4. Integrity Hash (SHA-256) → 5. WORM Storage → 6. Verification
```

---

### 2.2 Endpoint Protection Layer

#### 2.2.1 File System Monitoring
Real-time monitoring of all file system operations to detect suspicious patterns.

**Monitored Events:**
- File creation, modification, deletion, rename
- Permission changes (especially restrictive permissions)
- Mass file operations (>50 files in <60 seconds)
- File extension changes
- Creation of ransom notes (README.txt, DECRYPT.html, etc.)

**Detection Rules:**
```yaml
rules:
  - name: "Mass File Encryption"
    trigger:
      - files_modified: ">100"
        time_window: "60s"
        entropy_increase: ">20%"
    action: "ALERT_AND_ISOLATE"

  - name: "Shadow Copy Deletion"
    trigger:
      - command: "vssadmin delete shadows"
      - command: "wmic shadowcopy delete"
    action: "BLOCK_AND_ALERT"

  - name: "Suspicious Extension Change"
    trigger:
      - extension_change: "*.encrypted"
      - extension_change: "*.locked"
      - extension_change: "*.crypted"
    action: "IMMEDIATE_RESPONSE"
```

#### 2.2.2 Process Behavior Analysis
- **Process Monitoring**: Track all running processes and their behaviors
- **Behavioral Indicators**:
  - Rapid file encryption attempts
  - Execution from unusual locations (%TEMP%, %APPDATA%)
  - Network connections to known C2 servers
  - Registry modifications (boot persistence, auto-run)
  - Privilege escalation attempts

**High-Risk Process Patterns:**
- Encrypts >20 files in <10 seconds
- Deletes volume shadow copies
- Modifies boot configuration data (BCD)
- Establishes persistence mechanisms
- Communicates with Tor network or known ransomware infrastructure

#### 2.2.3 Network Traffic Analysis
- **Command & Control Detection**: Identify connections to ransomware C2 servers
- **Data Exfiltration Monitoring**: Detect unusual outbound data transfers
- **Threat Intelligence Integration**: Real-time feeds of known malicious IPs and domains
- **DNS Monitoring**: Track suspicious DNS queries (DGA domains, Tor exit nodes)

---

### 2.3 Behavioral Detection Engine

#### 2.3.1 Machine Learning Models
- **Training Data**: 500,000+ benign samples, 100,000+ ransomware samples
- **Algorithms**:
  - **Random Forest**: High accuracy for known ransomware families
  - **Neural Networks**: Zero-day ransomware detection via anomaly detection
  - **Gradient Boosting**: Optimized for low false-positive rate

**Detection Metrics:**
- **True Positive Rate (TPR)**: 99.7%
- **False Positive Rate (FPR)**: <0.1%
- **Detection Time**: <100ms average

#### 2.3.2 Entropy Analysis
File entropy is a strong indicator of encryption. Encrypted files have high entropy (7.5-8.0 bits per byte).

**Entropy Calculation:**
```python
import math
from collections import Counter

def calculate_entropy(data):
    if not data:
        return 0

    entropy = 0
    counter = Counter(data)
    length = len(data)

    for count in counter.values():
        probability = count / length
        entropy -= probability * math.log2(probability)

    return entropy

# Typical entropy values:
# - Plain text: 3.5-5.0
# - Compressed: 6.5-7.5
# - Encrypted: 7.9-8.0
```

**Alert Thresholds:**
- Entropy > 7.8: High suspicion
- Entropy increase > 20% for multiple files: Critical alert
- Average entropy across 100+ files > 7.5: Probable ransomware

#### 2.3.3 Signature Database
- **100,000+ Ransomware Signatures**: Including WannaCry, Ryuk, LockBit, REvil variants
- **Daily Updates**: Automatic signature updates from threat intelligence feeds
- **YARA Rules**: Advanced pattern matching for ransomware identification
- **Behavioral Signatures**: Identify ransomware families by behavior, not just file hashes

---

### 2.4 Automated Response System

#### 2.4.1 Incident Response Automation
When ransomware is detected, the system executes the following within milliseconds:

**Response Timeline:**
```
T+0ms:    Behavioral detection triggers alert
T+15ms:   Create file system snapshot
T+45ms:   Terminate malicious process
T+78ms:   Isolate endpoint from network
T+120ms:  Lock user account (prevent lateral movement)
T+250ms:  Alert SOC team via SIEM
T+1s:     Begin forensic data collection
T+5s:     Recovery plan ready for execution
```

#### 2.4.2 Network Isolation
- **Automatic Quarantine**: Suspected endpoints immediately isolated from network
- **Isolation Methods**:
  - 802.1X port shutdown
  - Firewall rule deployment (block all traffic)
  - VPN disconnection
  - Wi-Fi disassociation
- **Exceptions**: Allow communication only with management servers for remediation

#### 2.4.3 Process Termination
- **Kill Process Tree**: Terminate malicious process and all child processes
- **Memory Dump**: Capture process memory for forensic analysis
- **Registry Cleanup**: Remove persistence mechanisms
- **Scheduled Task Removal**: Delete any malicious scheduled tasks

---

### 2.5 Recovery Orchestration

#### 2.5.1 Recovery Time Objective (RTO)
- **Critical Systems**: RTO < 15 minutes
- **Standard Systems**: RTO < 1 hour
- **Non-Critical Systems**: RTO < 4 hours

#### 2.5.2 Recovery Point Objective (RPO)
- **Database Systems**: RPO < 5 minutes (continuous data protection)
- **File Servers**: RPO < 1 hour (hourly snapshots)
- **User Workstations**: RPO < 24 hours (daily backups)

#### 2.5.3 Restoration Workflow
```
1. Verify Threat Neutralization
   ↓
2. Identify Clean Backup Point (pre-infection)
   ↓
3. Restore Critical Systems First (priority order)
   ↓
4. Integrity Verification (hash comparison)
   ↓
5. Malware Scan Before Production
   ↓
6. Gradual Network Reconnection
   ↓
7. Post-Recovery Monitoring (72-hour watch)
```

#### 2.5.4 Integrity Verification
All restored data must be verified before production use:

```json
{
  "verification": {
    "hashAlgorithm": "SHA-256",
    "expectedHash": "a7f3c8e9d4b2f1a8c5d3e7b9f2a4c6d8e1f3a5b7c9d2e4f6a8b1c3d5e7f9a2b4",
    "actualHash": "a7f3c8e9d4b2f1a8c5d3e7b9f2a4c6d8e1f3a5b7c9d2e4f6a8b1c3d5e7f9a2b4",
    "status": "VERIFIED",
    "timestamp": "2025-12-25T10:30:00Z"
  }
}
```

---

## 3. Technical Specifications

### 3.1 Data Formats

#### 3.1.1 Backup Manifest Format
```json
{
  "version": "1.0.0",
  "standard": "WIA-SEC-022",
  "backup": {
    "id": "backup-20251225-103045",
    "timestamp": "2025-12-25T10:30:45Z",
    "type": "FULL",
    "source": {
      "hostname": "fileserver-01",
      "paths": ["/data", "/home"],
      "exclusions": ["*.tmp", "*.cache"]
    },
    "encryption": {
      "algorithm": "AES-256-GCM",
      "keyId": "key-2025-Q4-001",
      "iv": "base64-encoded-iv"
    },
    "compression": {
      "algorithm": "zstd",
      "level": 3,
      "ratio": 0.72
    },
    "storage": {
      "type": "WORM",
      "location": "s3://backup-vault-primary/2025/12/25/",
      "immutable": true,
      "retentionDays": 90
    },
    "integrity": {
      "algorithm": "SHA-256",
      "manifestHash": "sha256:abc123...",
      "blockHashes": ["sha256:block1", "sha256:block2"]
    },
    "metadata": {
      "fileCount": 12847,
      "totalSize": 2400000000,
      "compressedSize": 1728000000,
      "duration": "324s"
    }
  }
}
```

#### 3.1.2 Alert Format
```json
{
  "alertId": "ALERT-20251225-001",
  "timestamp": "2025-12-25T10:35:12Z",
  "severity": "CRITICAL",
  "type": "RANSOMWARE_DETECTED",
  "source": {
    "hostname": "workstation-42",
    "ip": "192.168.1.105",
    "user": "jdoe",
    "process": {
      "pid": 4829,
      "name": "malware.exe",
      "path": "C:\\Users\\jdoe\\AppData\\Local\\Temp\\malware.exe",
      "hash": "sha256:de4db33f..."
    }
  },
  "detection": {
    "method": "BEHAVIORAL_AI",
    "confidence": 0.997,
    "indicators": [
      "Mass file encryption (247 files in 15 seconds)",
      "High entropy increase (7.9 average)",
      "Shadow copy deletion attempt",
      "Ransom note creation"
    ]
  },
  "response": {
    "action": "AUTO_ISOLATED",
    "processTerminated": true,
    "networkIsolated": true,
    "snapshotCreated": true,
    "responseTime": "87ms"
  }
}
```

---

### 3.2 API Specifications

#### 3.2.1 Backup Management API

**Create Backup:**
```http
POST /api/v1/backup/create
Content-Type: application/json

{
  "source": "/data/critical",
  "type": "INCREMENTAL",
  "encryption": "AES-256-GCM",
  "storage": "WORM"
}

Response 201:
{
  "backupId": "backup-20251225-001",
  "status": "IN_PROGRESS",
  "estimatedCompletion": "2025-12-25T11:00:00Z"
}
```

**Verify Backup:**
```http
GET /api/v1/backup/{backupId}/verify

Response 200:
{
  "backupId": "backup-20251225-001",
  "verified": true,
  "integrity": "INTACT",
  "hashMatch": true,
  "restorable": true
}
```

**Restore Backup:**
```http
POST /api/v1/backup/{backupId}/restore
Content-Type: application/json

{
  "destination": "/restore/temp",
  "verifyIntegrity": true,
  "priority": "HIGH"
}

Response 202:
{
  "restoreId": "restore-20251225-001",
  "status": "IN_PROGRESS",
  "eta": "15 minutes"
}
```

#### 3.2.2 Threat Detection API

**Submit File for Analysis:**
```http
POST /api/v1/threat/analyze
Content-Type: multipart/form-data

file: [binary data]

Response 200:
{
  "analysisId": "analysis-001",
  "verdict": "RANSOMWARE",
  "confidence": 0.995,
  "family": "LockBit-3.0",
  "recommendations": [
    "Quarantine immediately",
    "Scan all network shares",
    "Review backup integrity"
  ]
}
```

---

### 3.3 Performance Requirements

| Metric | Requirement | Measurement |
|--------|-------------|-------------|
| **Detection Latency** | <100ms | Time from malicious action to alert |
| **Response Time** | <250ms | Time from alert to isolation |
| **Backup Window** | <4 hours | Time to complete full system backup |
| **Restore Time (RTO)** | <15 min | Critical systems back online |
| **Data Loss (RPO)** | <5 min | Maximum data loss for critical systems |
| **False Positive Rate** | <0.1% | Benign files flagged as ransomware |
| **Detection Rate** | >99.7% | Known ransomware variants detected |

---

### 3.4 Security Requirements

#### 3.4.1 Backup Security
- **Encryption**: All backups encrypted with AES-256 or stronger
- **Key Management**: Keys stored in HSM or cloud KMS, never on backup media
- **Access Control**: Role-based access (RBAC) with MFA required
- **Audit Logging**: All backup/restore operations logged and immutable

#### 3.4.2 Endpoint Agent Security
- **Code Signing**: All agents digitally signed with EV certificate
- **Tamper Protection**: Kernel-level protection prevents agent termination
- **Secure Communication**: TLS 1.3 with certificate pinning
- **Zero Trust**: Continuous verification of agent integrity

---

## 4. Integration Points

### 4.1 SIEM Integration
- **Supported Platforms**: Splunk, QRadar, Sentinel, Elastic Security
- **Log Formats**: CEF, LEEF, JSON, Syslog RFC 5424
- **Events**: Detection alerts, response actions, recovery status
- **Correlation**: Integrate with broader security analytics

### 4.2 EDR Integration
- **Supported EDR**: CrowdStrike, SentinelOne, Microsoft Defender
- **Bidirectional**: Receive EDR alerts, send isolation commands
- **Threat Hunting**: Share IOCs and behavioral signatures

### 4.3 SOAR Integration
- **Automation**: Trigger playbooks for incident response
- **Orchestration**: Coordinate multi-tool response workflows
- **Case Management**: Auto-create tickets in ServiceNow, Jira

---

## 5. Compliance & Standards

### 5.1 Regulatory Compliance
- **GDPR**: Right to erasure exceptions for immutable backups (legitimate interest)
- **HIPAA**: PHI backup encryption and access controls
- **PCI DSS**: Requirement 3.1 (data retention), 10.5 (audit log protection)
- **SOX**: Section 404 (internal controls for financial data)

### 5.2 Industry Standards
- **NIST Cybersecurity Framework**: PR.IP-4 (Backups maintained)
- **ISO 27001**: A.12.3 (Information backup)
- **CIS Controls**: Control 11 (Data Recovery Capability)

---

## 6. Testing & Validation

### 6.1 Backup Testing
- **Automated Testing**: Weekly restore tests of random backup sets
- **Full Restore Test**: Quarterly test of complete system restoration
- **Disaster Recovery Drill**: Annual full-scale DR exercise

### 6.2 Detection Testing
- **Ransomware Simulation**: Monthly tests with safe ransomware simulators
- **Red Team Exercises**: Quarterly penetration tests
- **Validation**: All known ransomware families detected in controlled tests

---

**Next:** [PHASE 2, 3 & 4 - Advanced Features](./PHASE-2-&-3-&-4.md)

---

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*弘益人間 · Benefit All Humanity*