Incident Response Procedures

Response Framework

Incident response procedures provide structured guidance for managing security incidents from initial detection through post-incident activities. This framework aligns with NIST SP 800-61 and SANS incident response methodologies, ensuring comprehensive and effective incident management.

Phase 1: Preparation

Preparation is the foundation of effective incident response. Organizations must establish capabilities, processes, and resources before incidents occur to ensure rapid and coordinated response.

Team Structure and Roles

Role	Responsibilities	Skills Required
Incident Commander	Overall incident management, decision making, stakeholder communication	Leadership, technical knowledge, communication
Security Analyst	Alert triage, investigation, evidence collection, threat analysis	SIEM, EDR, log analysis, forensics
Forensics Specialist	Evidence preservation, detailed analysis, root cause identification	Digital forensics, malware analysis, reverse engineering
IT Operations	System isolation, containment actions, restoration activities	System administration, networking, backup/recovery
Communications Lead	Internal/external communications, media relations, regulatory notifications	Crisis communications, legal/regulatory knowledge
Legal Counsel	Legal implications, regulatory compliance, evidence handling guidance	Cyber law, privacy regulations, e-discovery

Essential Tools and Resources

• Detection Platforms: Microsoft Sentinel, Microsoft Defender for Endpoint, network monitoring tools
• Forensics Tools: FTK Imager, Velociraptor, Volatility, Autopsy, KAPE
• Communication Channels: Microsoft Teams (dedicated incident response channels), secure conference bridges
• Documentation Systems: Ticketing platforms, incident tracking databases, evidence repositories
• Jump Kits: Pre-configured laptops, external storage, forensics software, network cables

Preparation Activities

• Develop and maintain incident response plan and playbooks
• Conduct regular tabletop exercises and simulations
• Establish communication trees and escalation procedures
• Document critical asset inventory and network diagrams
• Implement logging and monitoring across all critical systems
• Create backup and recovery procedures
• Establish relationships with external resources (legal, PR, forensics vendors)

Phase 2: Detection and Analysis

Accurate identification and analysis of security incidents is critical to effective response. This phase involves confirming that an incident has occurred, determining its scope, and assessing potential impact.

Initial Assessment

When an alert or suspicious activity is detected, analysts must quickly determine whether it represents a genuine security incident requiring escalation.

Assessment Criteria:

• Validation: Is this activity genuinely malicious or a false positive?
• Scope: How many systems, users, or data assets are affected?
• Severity: What is the potential business impact?
• Urgency: Is the threat actively spreading or causing damage?
• Classification: What type of incident is this (malware, data breach, unauthorized access)?

Incident Severity Classification

Severity	Description	Response Time	Escalation
Critical (P1)	Active breach, ransomware, significant data loss, critical system compromise	Immediate	Incident Commander, Executive Leadership
High (P2)	Confirmed malware, unauthorized access, potential data exposure	Within 1 hour	Incident Commander, IT Management
Medium (P3)	Suspicious activity, policy violations, contained threats	Within 4 hours	Security Team Lead
Low (P4)	Anomalies requiring investigation, attempted attacks blocked by controls	Next business day	Security Analyst

Investigation and Analysis

Conduct thorough analysis to understand the incident's full scope, attack vectors, and affected systems.

Analysis Activities:

• Review logs from affected systems, firewalls, and security tools
• Analyze malware samples in isolated sandbox environments
• Identify indicators of compromise and search for them across the environment
• Determine initial access vector and timeline of attacker activities
• Identify compromised accounts, systems, and data
• Assess attacker objectives and potential next steps
• Correlate with threat intelligence to identify threat actor TTPs

Phase 3: Containment

Containment aims to prevent the incident from spreading while maintaining business operations and preserving evidence for investigation.

Short-Term Containment

Immediate actions to stop the incident from spreading:

• Isolate affected systems from the network (quarantine in Microsoft Defender)
• Disable compromised user accounts
• Block malicious IP addresses and domains at perimeter firewalls
• Shut down affected services or applications
• Implement emergency firewall rules to restrict lateral movement
• Take forensic images of affected systems before making changes

Long-Term Containment

Sustained containment while preparing for eradication and recovery:

• Apply temporary patches or workarounds to vulnerable systems
• Implement additional monitoring on contained systems
• Segment networks to limit attacker access
• Establish clean communication channels for response team
• Deploy honeypots or deception technology to monitor attacker activities

Phase 4: Eradication

Remove the threat from the environment and address vulnerabilities that allowed the incident to occur.

Eradication Activities

• Remove malware from all infected systems
• Delete attacker tools, backdoors, and persistence mechanisms
• Reset credentials for all compromised accounts
• Patch vulnerabilities exploited during the attack
• Remove unauthorized accounts, services, and scheduled tasks
• Rebuild severely compromised systems from known-good backups
• Verify complete removal through re-scanning and monitoring

Phase 5: Recovery

Restore systems to normal operation with enhanced security controls to prevent recurrence.

Recovery Process

• Restore systems from clean backups or rebuild from trusted sources
• Apply all security patches and updates before reconnecting to network
• Implement additional security controls based on lessons learned
• Restore data from backups, validating integrity before restoration
• Gradually return systems to production with enhanced monitoring
• Verify all security controls are functioning properly
• Monitor restored systems closely for signs of re-infection

Validation Testing

Before fully returning systems to production:

• Scan systems with multiple anti-malware engines
• Review logs for any suspicious activity
• Test restored functionality and data integrity
• Verify security configurations and access controls
• Conduct vulnerability assessments

Phase 6: Post-Incident Activities

Document findings, improve processes, and implement measures to prevent future incidents.

Post-Incident Review

Conduct a lessons-learned meeting within two weeks of incident closure, involving all response team members.

Review Topics:

• What happened and how was it detected?
• What worked well during response?
• What could be improved?
• Were procedures followed? Were they adequate?
• What additional tools or training are needed?
• How can similar incidents be prevented?
• What security controls should be implemented or enhanced?

Documentation Requirements

• Incident Report: Comprehensive timeline, actions taken, findings, impact assessment
• Executive Summary: High-level overview for leadership and stakeholders
• Technical Report: Detailed technical analysis, IOCs, attack vectors, forensic findings
• Evidence Documentation: Chain of custody, forensic images, log files, analysis results
• Improvement Plan: Action items to enhance security posture and response capabilities

Continuous Improvement

• Update incident response procedures based on lessons learned
• Implement recommended security enhancements
• Conduct additional training on identified gaps
• Update detection rules to identify similar attacks
• Share threat intelligence with industry peers
• Test improvements through tabletop exercises

Communication Procedures

Effective communication during incidents is critical for coordinated response and stakeholder management.

Internal Communication

• Establish dedicated incident response channel (Microsoft Teams)
• Provide regular status updates to incident commander and management
• Document all decisions and actions in incident timeline
• Coordinate across technical teams (security, IT, development)
• Brief executives on business impact and response progress

External Communication

• Notify law enforcement for criminal activity (FBI, Secret Service)
• Report data breaches to regulatory authorities as required
• Inform affected customers, partners, and vendors
• Coordinate with cyber insurance providers
• Manage media inquiries through designated spokesperson
• Work with legal counsel on all external communications