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Computer Hacking Forensic Investigator Course | CHFI

In the digital era, cyber attacks, internal fraud, and online malicious acts are multiplying. When an incident occurs, it is imperative to understand who did what, when, how and why. That's where it comes in.digital investigation (or legal IT), a crucial discipline for cybersecurity, law and IT professionals.

This guide presents the Key steps in a digital investigation, from the detection of an incident to the presentation of evidence exploitable in court.

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1. Identification of the incident

The investigation begins with the awareness that an abnormal event has taken place. This can come from an alert system (SIEM, IDS/IPS), from a user, or from a routine audit.

Objective: to determine if there is genuine security incident.

Examples:

• Unauthorized access to a system
• Suspect file transfer
• Clearing sensitive data

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2. Preservation of evidence

Once the incident is identified, it is essential to preserve the digital evidence before handling, for avoid unintentional alteration or deletion.

Good practices:

• Isolate the affected system from the network.
• Realize a copy bit to bit Hard drive or RAM memory.
• Document each action performed (conservation chain).

Common tools: FTK Imager, dd, Guymager.

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3. Data acquisition

The acquisition consists of: copy all relevant data (hard drives, USB drives, system logs, emails, cloud servers, etc.), while respecting legal rules.

Types of sources:

• Fixed/portable computers
• Mobile phones
• Servers (local or remote)
• Cloud applications and online services

Attention: this step must guarantee Integrity data (via hashs MD5/SHA1).

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4. Data analysis

This is where the real investigation begins. The analyst examines the evidence for identify suspicious actions, modified files, unusual connections or deleted traces.

Typical steps:

• Reconstitution of the timeline of events.
• Analysis of system files (newspapers, temporary files, basket).
• Detection of malware or automation scripts.
• Extracting deleted passwords or messages.

Tools: Autopsy, EnCase, X-Ways, Volatility (for memory).

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5. Correlation and interpretation

The technical results shall be interpreted in their context, in order to tell a coherent history the incident.

Examples:

• Identify the user who logged in at an abnormal time.
• Prove files were copied to external support.
• Linking discovered malware to a known attack campaign.

This step often involves collaboration between analysts, lawyers and security managers.

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6. Preparation of the survey report

The analyst must produce a clear, structured and comprehensible even by non-technicalists. It is used to inform management, support legal action, or guide a remedy.

Expected content:

• Description of the systems analysed
• Methodology used
• Observed facts (with evidence)
• Interpretations and conclusions
• Recommendations

Tip: the report must remain objective and factual.

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7. Legal presentation (if applicable)

If the case is brought to justice, the analyst may be brought to testify as an expert. He must then defend the validity of its methods and integrity of evidence.

Prerequisites:

• Respect for the conservation chain
• Documented and reproducible procedures
• Compliance with local laws (GDPR, CNIL, labour law)

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8. Learning and continuous improvement

Once the survey is completed, it is essential to learn from it. This can lead to:

• Reviewing security policies
• Train users
• Update detection tools
• Improve SOC team responsiveness

The investigation thus becomes a source of progress for the organization.

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Conclusion

The digital investigation is a discipline, which requires technical skills, methodology and high professional ethics. Each step – from identification to restitution – plays a crucial role in understanding incidents, protecting digital assets and ensuring justice.

In a world where cyber threats are changing rapidly, mastering the fundamentals of digital investigation has become indispensable, whether for cybersecurity analysts, IT managers or specialized lawyers.