Security Incident Response

Overview

Response Process

1. Preparation Phase

• Establish a response team
• Develop a response plan
• Prepare tools and resources
• Set up communication channels

2. Identification Phase

• Monitor alerts
• Anomaly detection
• Log analysis
• User reports

3. Containment Phase

• Isolate affected systems
• Disable compromised accounts
• Block network connections
• Back up evidence

4. Eradication Phase

• Remove malware
• Patch vulnerabilities
• Reset credentials
• Clean up backdoors

5. Recovery Phase

• Restore from backups
• Verify system integrity
• Monitor systems
• Gradually restore services

6. Post-Incident Review Phase

• Incident reporting
• Lessons learned
• Improvement measures
• Update processes

Tool Usage

Log Analysis

# Search logs
index=security event_type="failed_login"

# Statistical analysis
index=security | stats count by src_ip

# Time series analysis
index=security | timechart count by event_type

# Elasticsearch query
GET /logs/_search
{
  "query": {
    "match": {
      "event_type": "malware"
    }
  }
}

Forensic Tools

# Analyze memory dump
volatility -f memory.dump imageinfo

# List processes
volatility -f memory.dump --profile=Win7SP1x64 pslist

# Extract process memory
volatility -f memory.dump --profile=Win7SP1x64 memdump -p 1234 -D output/

# Launch Autopsy
# Create case
# Add evidence
# Analyze data

Network Analysis

# Capture traffic
wireshark -i eth0

# Analyze PCAP file
wireshark -r capture.pcap

# Filter traffic
# Display filter: ip.addr == 192.168.1.100
# Capture filter: host 192.168.1.100

# Capture traffic
tcpdump -i eth0 -w capture.pcap

# Analyze traffic
tcpdump -r capture.pcap -A

Incident Types

Malware

1. Isolate affected systems
2. Collect samples
3. Analyze malware
4. Eradicate threats
5. Patch vulnerabilities

• VirusTotal
• Cuckoo Sandbox
• YARA Rules

Data Breach

1. Confirm breach scope
2. Contain the breach
3. Assess impact
4. Notify relevant parties
5. Patch vulnerabilities

• Volume of leaked data
• Affected users
• Breach channels
• Data sensitivity

Denial of Service

1. Confirm attack type
2. Enable protective measures
3. Filter malicious traffic
4. Monitor system status
5. Restore normal services

• DDoS protection services
• Traffic scrubbing
• Rate limiting
• CDN protection

Unauthorized Access

1. Disable compromised accounts
2. Reset credentials
3. Review access logs
4. Assess data access
5. Patch vulnerabilities

• Access time
• Accessed content
• Access source
• Data modifications

Response Checklist

Preparation Phase

• Establish response team
• Develop response plan
• Prepare tools
• Set up communication channels

Identification Phase

• Confirm incident
• Collect information
• Assess impact
• Record timeline

Containment Phase

• Isolate systems
• Disable accounts
• Block connections
• Back up evidence

Eradication Phase

• Remove threats
• Patch vulnerabilities
• Reset credentials
• Verify eradication

Recovery Phase

• Restore systems
• Verify integrity
• Monitor systems
• Restore services

Post-Incident Review Phase

• Write report
• Summarize lessons learned
• Implement improvements
• Update processes

Best Practices

1. Preparation

• Establish response team
• Develop response plan
• Conduct regular drills
• Prepare tools

2. Response

• Respond quickly
• Handle systematically
• Document all actions
• Preserve evidence

3. Communication

• Internal communication
• External notifications
• Status updates
• Post-incident reporting

4. Improvement

• Incident analysis
• Process improvement
• Tool updates
• Training enhancement

Notes

• Respond quickly
• Preserve evidence
• Document actions
• Comply with laws and regulations