Hello aspiring cyber forensic invetigators. In our previous blogpost, you learnt what is digital forensics, types of digital forensics and stages of a digital forensic investigation. In this article, you will learn about computer forensics, one of the branches of digital forensics.
What is computer forensics?
Computer forensics (often interchangeably and mistakenly used with digital forensics) is a branch of digital forensics in which the digital evidence is collected and analyzed from computer systems like workstations, servers and Laptops. It is a process of identifying, preserving, analyzing and presenting digital evidence in a way that is legally sound but focussed on computers, hard drives and data storage systems.
The goal of computer forensics is to:
- Investigate digital crimes
- Recover lost or hidden data
- Understand how a breach or attack occurred
- Support legal proceedings with solid digital evidence
Just like physical detectives collect fingerprints or DNA, computer forensic investigators collect digital footprints like logs, browser history, downloads, recent files, emails, file metadata, internet activity, user activity, login activity, running processes. programs and open network connections etc.
Common Steps in a Computer Forensics Investigation
Although every case is different, most computer forensics investigations follow the same process every digital forensic investigation has to follow. Here’s a simplified breakdown:
1. Identification:
Determine the computer devices on which digital evidence can be present. Then, identify what data needs to be examined and where it’s stored. This might involve computers, hard drives, RAM etc.
2. Acquisition and Preservation:
Next important step is to acquire the evidence and preserve it without the fear of contamination. Forensics experts often create a forensic image — an exact, bit-by-bit copy of a device — to work from, while preserving the original. Hard disks of computers can be imaged using tools like dd, dcfldd, Guymager, FTK Imager etc. Forensic images of RAM can be taken using tools like DumpIt, WinPmem, Magnet RAM capture for Windows, LiME, Compile and Load, AVML for Linux and OSXPmem for macOS.
The preservation of the forensic image can be achieved using hashing tools and write blockers. Some of the hashing tools are sha256sum, CertUtil, Get-FileHash etc.
3. Analysis:
This is the deep dive. Investigators look through files, logs, emails, browser history and other data sources to find relevant evidence to a data breach or cybercrime. Analysis should always be done on the forensic image and not on the original.
Generally forensic analysis involves file carving, timeline analysis, Partition and volume analysis, RAM analysis, examining metadata etc. Some of the tools used here are Foremost, Scalpel, TestDisk for carving, fdisk and Autopsy for partition and volume analysis, Log2timeline, Plaso, Timesketch for timeline analysis and Volatility for RAM analysis.
4 Documentation
The computer forensic investigation procedure from the beginning needs to be carefully recorded and documented to ensure that the evidence can be used in court. Even small mistakes in this step could lead to evidence being thrown out.
5. Reporting:
Investigators should prepare a detailed report explaining what was found, how it was found and what it means. This will be useful in legal proceedings or internal investigations.
Uses of computer forensics
Computer forensics plays an important role in:
- Law enforcement: To investigate crimes like fraud, hacking, identity theft, or online harassment.
- Businesses: To examine data breaches, insider threats or employee misconduct.
- Cybersecurity teams: To analyze how attackers got in and what data was affected.
- Legal cases: To gather digital evidence for civil lawsuits or intellectual property disputes.
As the threat of data breaches, cyber crimes, identity theft cases increase exponentially, the importance of digital evidence — and the people who know how to handle it — will only grow. Whether you want to protect your business, support law enforcement, or start a career in cybersecurity, learning computer forensics is a smart step forward. Next, learn about mobile forensics, another important branch of digital forensics.
























