Digital Forensics Tools, Tactics, and Procedures

The field of digital forensics has matured alongside the broader IT landscape. Today, a variety of vendors and academic institutions certify digital forensic specialists.

Security professionals should understand the tools, tactics, and procedures of digital forensics to ensure that data remains available for investigation and admissible as evidence in potential legal proceedings.

Here are a few core principles every professional should understand when working with digital forensics evidence:

• Document everything. Thorough documentation is critical in digital forensics. Every action taken, by the forensic analyst or anyone with access to the scene or evidence, must be carefully recorded. Documentation should:
• Answer key questions. Address who, what, where, why, and when for any interaction with the evidence.
• Ensure reproducibility. Be detailed enough that another qualified professional could replicate the analysis using the same original material.
• Include the chain of custody. Track all stages of evidence handling: collection or capture, analysis, and storage.

• Avoid unrecorded or unintended modification. Preserving the original state of evidence is essential. During capture and analysis, forensics professionals must take steps to avoid altering the original material. This includes:
• Using protective technologies:
• Employ write-blocking technology to prevent data modification.
• Control access to the system or media. (
• Limit exposure to electromagnetic emissions that could affect data.
• Working from copies:
• Perform all analysis on forensic copies, whenever possible.
• Documenting preservation efforts:
• Record every measure taken to protect the integrity of the original evidence, in alignment with documentation principles.

• Evidence collection requires careful judgment. Responders must balance the urgency of minimizing harm with the need to preserve valuable evidence. Key considerations include:
• Speed vs. preservation:
• Quick action can reduce damage or prevent further compromise, but it may risk losing critical data.
• Volatility of random-access memory RAM:
• RAM is highly volatile and may hold key evidence.
• Powering down a system typically renders RAM data unrecoverable by standard means.
• Impact of shutdown:
• Shutting off a system may stop malware from spreading, but it can also erase evidence vital to the investigation.

requires such specific on staff because that is a very knowledge and skills, it is best specific discipline, requiring to use a certified or licensed extensive training and external contractor when experience, for an uncommon necessary. activity in most business In some jurisdictions, such as the U.S.

endeavors.

states of Texas and Michigan, forensic analysis cannot be performed as a service

In urgent situations, first responders have

(i.e., professionally for pay or fees), unless

higher priorities, such as protecting life, the analyst is licensed by the government.

and may be less careful while working

In these examples, the required license is in the scene. Organizations should know

for the profession of "private investigator."

that situations involving malfunctions

Be sure your organization considers all or anomalous activities are often first applicable laws when crafting its own investigated by help desk or other systems policies regarding evidence collection, support staff, and not treated as the scene analysis, and presentation.

of a potential crime or deliberate act that warrants a formal forensic investigation. At

When taking a digital case to court, the some point, the normal business pressure question of admissibility is crucial. The to return a system or workflow to proper way we can ensure evidence submitted operation can precondition the organization to the court is accepted is through its to treat systems anomalies as problems to documentation. Not every piece of altered be solved rather than intrusions, disruptions, evidence will be inadmissible, just like not or other hostile actions that need to be all unaltered evidence will be accepted. investigated. It all depends on how the evidence is documented, preserved, and presented, Organizations may be tempted, when which again steers us in the direction forensic analysis is required, to allow of hiring dedicated professionals who someone else (a member of the security specialize in digital forensics and evidence team or someone from the IT department) gathering.

to perform the task-this is not recommended.