Traffic Baseline Comparison
Action: Compare current traffic with historical baselines.
Details:
- Use network monitoring tools like Wireshark, tcpdump, or NetFlow analyzers.
- Capture and analyze traffic patterns to identify any significant deviations.
Example: Use Wireshark to capture and analyze current traffic patterns, comparing them with historical baselines for any unusual deviations.
Flow Analysis
Action: Analyze flow data to identify communication patterns.
Details:
- Use NetFlow or similar tools to identify unexpected connections or unusual protocols.
- Look for a high number of connections from a single source, indicative of potential anomalies.
Example: Analyze NetFlow data to identify unexpected communication patterns and recognize a high number of connections from a specific source.
Protocol Analysis
Action: Analyze protocols involved in the surge.
Details:
- Investigate potentially malicious or uncommon protocols.
- Scrutinize non-standard ports for signs of suspicious activity.
Example: Scrutinize network traffic for non-standard protocols and investigate uncommon protocols associated with the surge.
Bandwidth Consumption
Action: Identify sources and destinations of increased traffic.
Details:
- Correlate with other data sources to determine the involvement of specific systems.
- Assess if the surge aligns with known legitimate activities.
Example: Correlate increased traffic with specific systems and assess whether it aligns with known legitimate activities.
Threat Intelligence Integration
Action: Integrate threat intelligence feeds.
Details:
- Check if IP addresses or domains associated with the surge are linked to known threats.
- Leverage threat intelligence for contextual understanding.
Example: Integrate threat intelligence feeds to check if IP addresses associated with the surge are linked to known threats.
Collaboration with Other SOC Teams
Action: Collaborate with other SOC teams.
Details:
- Engage with endpoint analysts and threat hunters to gain diverse insights.
- Share findings with incident response teams for aligned response strategies.
Example: Collaborate with endpoint analysts and share findings with incident response teams to enhance overall understanding.
Incident Response Plan Activation
Action: Activate the incident response plan.
Details:
- If deemed suspicious or potentially malicious, initiate the incident response plan.
- Define roles and responsibilities within the SOC for a coordinated and swift response.
Example: If the surge is deemed suspicious, activate the incident response plan, defining specific roles for a coordinated response. Communication with IT Teams
Action: Communicate with IT teams.
Details: Gain insights into recent changes in network or system configurations. Verify if authorized activities explain the observed surge. Example: Communicate with IT teams to understand recent changes in network configurations and verify if authorized activities explain the observed surge.
Severity Assessment
Action: Assess the severity of the situation.
Details:
- Consider the impact on network performance, the criticality of affected systems, and potential data exfiltration.
- Use predefined criteria to categorize incident severity.
Example: Assess the severity based on the impact on network performance, critical systems, and the potential for data exfiltration.
False Alarm Example
Scenario: Encounter a surge initially suspected as a DDoS attack.
Details:
- Analyze further, discovering the surge is due to an anticipated marketing campaign.
- Communicate promptly with marketing teams and establish a process for informing the SOC about expected traffic spikes.
Example: Discover that the surge is a false alarm related to an anticipated marketing campaign, promptly communicate with marketing teams, and establish a process for future notifications.
Conclusion
Effectively analyzing a surge in network activity involves a combination of technical analysis, collaboration with SOC teams, and adherence to incident response protocols. The integration of threat intelligence provides crucial contextual information, while collaboration ensures a comprehensive understanding of the situation. The incident response plan serves as a structured guide for coordinated actions. Additionally, the experience of handling false alarms underscores the importance of clear communication and collaboration to avoid misunderstandings in the future.