Intrusion Investigation (en)

Network Investigation is a systematic process of collecting, analyzing, and interpreting data from a computer network to identify, understand, and respond to cybersecurity incidents. The main objective of network investigation is to find the root cause of a security problem, gather digital evidence that can be presented in court, and take steps to prevent similar incidents from occurring in the future.

Intrusion Investigation

Intrusion investigation is an important part of network investigation that focuses on efforts to identify and analyze unauthorized or suspicious activity within a network. The goal is to determine how an attacker gained access to the system, what they did, and how to prevent them in the future.

General Stages of Intrusion Investigation:

1. Incident Identification:

• Detecting anomalies in system, network, or application logs.
• Receiving reports from users or intrusion detection systems (IDS).

2. Evidence Collection:

• Server Log Analysis: Collecting and analyzing logs from various sources such as firewalls, operating systems, applications, and network devices.
• Image Acquisition: Creating a forensic copy of the infected system to prevent evidence contamination.
• Memory Analysis: Examining system memory for suspicious processes or running malware.
• Network Packet Analysis: Analyzing network traffic to identify suspicious activity.

3. Analysis:

• Log Analysis: Identifying patterns, anomalies, and unusual activity in logs.
• Reverse Engineering Malware: Analyzing malware to understand its functionality and how it operates.
• Digital Footprint Analysis: Tracking attacker activity through systems and networks.

4. Reporting:

• Compiling a detailed report on the investigation findings, including a timeline of events, techniques used by the attacker, and recommendations for remediation.

Server Log Analysis

Server log analysis is the process of examining log files from various network devices and systems to identify suspicious activity. Server logs contain records of all activities that occur on a system, including login attempts, file access, system errors, and network activity.

Objectives of Server Log Analysis:

• Intrusion Detection: Identifying unauthorized or suspicious activity.
• Troubleshooting: Finding the root cause of technical issues.
• Compliance: Meeting regulatory and compliance requirements.

Tools Used:

• Log Management Solutions: Splunk, ELK Stack, Graylog.
• Security Information and Event Management (SIEM): OpenSearch, OSSEC, SecurityOnion, Wazuh

Malware Detection

Malware detection is the process of identifying and removing malicious software from a system. Malware can include viruses, worms, Trojan horses, ransomware, and other types of malware.

Malware Detection Techniques:

• Signature-based Detection: Detecting malware based on known signatures.
• Heuristic Analysis: Analyzing malware behavior to identify new, unknown types.
• Behavioral Analysis: Studying system behavior to identify unusual activity.

Tools Used:

• Antivirus: McAfee, Symantec, Kaspersky.
• Endpoint Detection and Response (EDR): CrowdStrike, Carbon Black.

Incident Response

Incident response is a series of steps taken to identify, analyze, and respond to security incidents. The aim is to minimize the impact of the incident, recover affected systems, and prevent similar incidents in the future.

Stages of Incident Response:

1. Preparation: Developing an incident response plan, training the team, and testing procedures.
2. Detection and Analysis: Identifying incidents, collecting evidence, and analyzing the root cause.
3. Containment: Limiting the spread of the incident.
4. Eradication: Removing malware or other threats.
5. Recovery: Restoring affected systems.
6. Lessons Learned: Analyzing the incident to improve security procedures.

Tools Used

• Security Orchestration, Automation, and Response (SOAR): Demisto, ServiceNow.
• Incident Response Playbooks: Documents containing detailed steps for responding to various types of incidents.

Conclusion

Network investigation is an essential part of cybersecurity. By understanding the processes and tools used in intrusion investigation, server log analysis, malware detection, and incident response, organizations can be more effective in protecting their digital assets.

Interesting Links

• Forensic: IT
• Network forensics techniques such as packet capture, disk imaging, and memory analysis.
• Popular network forensics tools like Wireshark, FTK Imager, and EnCase.
• Common cybersecurity threats and ways to address them.
• Best practices for enhancing network security.