Here's how you can handle a network security incident.

To handle a network security incident, below are some steps: Activate the Incident Response Plan. Contain the Threat: Isolate affected systems to prevent the attack from spreading. Log collection & Preservation. Assess and Investigate: Conduct thorough investigation. Communicate: Inform internal stakeholders, relevant authorities, and potentially affected customers. Eradicate the Threat: Remove malicious software and close vulnerabilities. Recover Systems: Restore data from backups and bring systems back online securely. Conduct Post-Incident Review: Analyze the incident to improve future response and security measures. Update Security Measures: Implement lessons learned and strengthen defenses to prevent future incidents.

1. Building incident response plan with team 2. using SIEM and SOAR like advanced technologies 3. having hybrid model where we use IDS and IPS technologies which can detect and prevent the threat 4. configuring the policies for generating alert if any new threat is found. 5. using sandbox inspection for packet analysis to know what is travelling through your network.

In addition to the initial identification, it’s crucial to establish a baseline of normal network behavior. This baseline can serve as a comparative measure when investigating potential security incidents. Regularly reviewing and updating this baseline is key, as it accounts for changes in network traffic patterns and system usage. Also, remember that communication is vital during this phase. Ensure that all relevant parties, including IT staff and management, are promptly informed about the incident. This ensures a coordinated and effective response, minimizing the potential damage caused by the incident.

?Utilize SIEM tools such as Splunk or IBM QRadar to gather, assess, and link security event information from all parts of the network, giving immediate notifications for possible incidents. ?Employ SIEM platforms like Splunk or IBM QRadar for gathering, analyzing, and connecting security event data from different network sources, offering real-time alerts for potential incidents.

?Develop and maintain a comprehensive incident response plan that outlines roles, responsibilities, and procedures for handling security incidents. ? For example, during a ransomware attack, the incident response team quickly isolates affected systems to prevent the spread.

Ensure all affected devices are quarantined to limit the attacker's movement and minimize the potential for lateral spread. Additionally, consider implementing network segmentation to create internal barriers that can prevent the threat from propagating across different parts of the network.

Also conduct a thorough scan to identify all malicious files and programs, ensuring they are completely removed. Additionally, review and enhance your security policies to address any weaknesses that were exploited.

After it’s all over, bring key stakleholders together and do a post-mortem: how did the attack happen, what went wrong, was it preventable and how. Then open corrective actions to address changes in people, processes and technology.

?Real-World Scenario? Imagine a company discovers a ransomware attack on its file servers. The senior security engineer immediately isolates the servers, preventing the ransomware from spreading to other parts of the network. The engineer then identifies the ransomware strain, removes it using specialized tools, and restores the servers from clean backups. Post-incident, the engineer updates security policies, conducts employee training on phishing awareness, and implements continuous monitoring to detect future threats early.

A successful incident response requires a well-coordinated effort, clear communication, and continuous improvement of your security practices.