Information Security Manager Iso27001

# Incident Response Procedures

Security incident detection, response, and recovery procedures per ISO 27001 requirements.

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## Table of Contents

- [Incident Classification](#incident-classification)
- [Response Procedures](#response-procedures)
- [Escalation Matrix](#escalation-matrix)
- [Communication Templates](#communication-templates)
- [Recovery Checklists](#recovery-checklists)
- [Post-Incident Activities](#post-incident-activities)

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## Incident Classification

### Incident Categories

| Category | Description | Examples |
|----------|-------------|----------|
| Security Breach | Unauthorized access to systems/data | Account compromise, data exfiltration |
| Malware | Malicious software infection | Ransomware, virus, trojan |
| Data Leakage | Unauthorized data disclosure | Accidental email, misconfigured storage |
| Denial of Service | Service availability impact | DDoS attack, resource exhaustion |
| Policy Violation | Security policy breach | Unauthorized software, data handling |
| Physical | Physical security incident | Theft, unauthorized entry |

### Severity Levels

| Level | Criteria | Response Time | Examples |
|-------|----------|---------------|----------|
| **Critical (P1)** | Active breach, data loss, system down | Immediate (15 min) | Ransomware, confirmed breach |
| **High (P2)** | Active threat, potential data exposure | 1 hour | Malware detected, suspicious access |
| **Medium (P3)** | Contained threat, limited impact | 4 hours | Failed attacks, policy violations |
| **Low (P4)** | Minor issue, no immediate risk | 24 hours | Suspicious emails, minor violations |

### Severity Decision Tree

```
Is there active data loss or system compromise?
├── Yes → CRITICAL (P1)
└── No → Is there an active uncontained threat?
          ├── Yes → HIGH (P2)
          └── No → Is there potential for data exposure?
                    ├── Yes → MEDIUM (P3)
                    └── No → LOW (P4)
```

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## Response Procedures

### Phase 1: Detection and Reporting

**Objective:** Identify and report security incidents promptly.

**Steps:**
1. Identify potential incident through monitoring, alerts, or reports
2. Document initial observations (time, systems, symptoms)
3. Report to Security Team via designated channel
4. Assign incident ID and log in tracking system

**Validation:** Incident logged within 15 minutes of detection.

**Documentation Required:**
- Date/time of detection
- Detection source (monitoring, user report, automated alert)
- Affected systems/users (initial assessment)
- Reporter information

### Phase 2: Triage and Assessment

**Objective:** Determine incident scope and severity.

**Steps:**
1. Gather additional information (logs, system state)
2. Determine incident category and severity
3. Identify affected assets and potential impact
4. Assign incident owner and response team

**Validation:** Severity assigned and escalation triggered if needed.

**Assessment Checklist:**
- [ ] Systems affected identified
- [ ] Data types potentially impacted
- [ ] Attack vector determined
- [ ] Scope (single system vs. widespread)
- [ ] Business impact assessed

### Phase 3: Containment

**Objective:** Limit damage and prevent spread.

**Immediate Containment (Short-term):**
1. Isolate affected systems from network
2. Disable compromised accounts
3. Block malicious IPs/domains
4. Preserve evidence before changes

**Long-term Containment:**
1. Apply temporary fixes
2. Implement additional monitoring
3. Strengthen access controls
4. Prepare for eradication

**Validation:** Containment confirmed, no ongoing spread.

**Containment Actions by Incident Type:**

| Incident Type | Containment Actions |
|---------------|---------------------|
| Account Compromise | Disable account, revoke sessions, reset credentials |
| Malware | Isolate host, block C2 domains, scan related systems |
| Data Breach | Block exfiltration path, revoke access, enable DLP |
| DDoS | Enable DDoS protection, rate limiting, traffic scrubbing