Digital forensics and incident response (DFIR) is a rapidly growing field that demands dynamic thinking and a novel approach. Combining digital investigative services with incident response expertise is critical to manage the growing complexity of modern cybersecurity incidents.
Digital forensics and incident response are branches of cybersecurity that involve identifying, investigating, containing, remediating and potentially testifying related to cyberattacks, litigations or other digital investigations.
DFIR services combine two major components:
In the early days of digital forensics and incident response, while the goals of matters pertaining to each may have differed, the tools, process, methodology and technology used were, in many ways, similar or identical. Historically, the method of collecting data for DFIR matters was often to collect forensic images of user’s computers and company servers as well as copies of log data, where stored separately. These large sets of data were then analyzed using investigative tools to convert and interpret data on the computer systems into information that could be understood by computer experts, who could then work to identify potentially relevant information.
Digital forensic matters generally still follow the same process as they did historically because of the deep-dive level of scrutiny required to collect and analyze data to then present in court or to a regulator. However, in modern-day incident response matters, the tools and approach have evolved to better meet the differing goals of incident response by leveraging ever-evolving technology.
Today, incident response is often performed using EDR or XDR tools that give responders a view into data on computer systems across a company’s environment. This is often accessible immediately or very quickly across dozens, hundreds or even thousands of endpoints. This rapid access to useful investigative information means that in an incident, responders can start getting answers about what is happening very quickly even if they do not already know where in the environment they need to look. Such tools can also be used to remediate and recover by identifying, stopping and removing malware or other tools used by a threat actor in the environment.
Digital forensics generally seeks to collect and investigate data to determine the narrative of what transpired. Incident response generally seeks to investigate, contain and recover from a security incident. They share a history as well as many tools, processes and procedures. In addition, a matter involving responding to an incident today may end up in litigation in the future. Because of the history, the overlap in tools/process, and because an incident response matter may lead into a digital forensics matter or vice versa, these two types of services are commonly still described as one group of services: digital forensics and incident response (DFIR).
As computer systems have evolved, so too have the challenges involved in DFIR. There are several key obstacles digital forensics and incident response experts face today.
These challenges call for DFIR experts to help support growing alerts and complex datasets and take a unique and flexible approach to threat hunting within modern, ever-evolving systems.
A robust DFIR service provides an agile response for businesses susceptible to threats. It gives you peace of mind that expert teams with vast knowledge of cyber incidents will respond to attacks quickly and effectively.
The success of DFIR hinges on rapid and thorough response. It’s crucial that digital forensic teams have ample experience and the right DFIR tools and processes in place to provide a swift, practical response to any issue.
Expertise in digital forensics has a number of benefits, including the ability to discover the cause of an incident and accurately identify the scope and impact. Employing the right investigative tools will ensure prompt discovery of the vulnerabilities that led to an attack or unintentional exposure.
Incident response services are tailored to manage an incident in real time. IR best practices include preparation and planning as well as timely, accurate and reliable mitigation and response to reduce reputational harm, financial loss and business downtime.
Combined, digital forensics and incident response best practices include determining the root cause of issues, correctly identifying and locating all available evidence/data, and offering ongoing support to ensure that your organization’s security posture is bolstered for the future.
The Palo Alto Networks Unit 42 ® DFIR solution is uniquely driven by threat intel, and every responder on our team is an expert equipped with cutting-edge tools and techniques. Our DFIR process consists of two steps that work in tandem.
Each process and step must be optimized to ensure a speedy recovery and set the organization up with the best chance of success in the future.
Unit 42’s Incident Response consultants have experience performing IR in traditional computing and in all major Cloud Service Provider environments. Our DFIR-specific methods can help you recover from security incidents with rapid scoping, access, investigation and containment specific to the detected threat. We have built playbooks for the top cyber incidents our customers face, and we provide tabletop exercises to familiarize them with every phase of the IR playbook. Learn more about how Unit 42 DFIR services can help protect your organization.
Digital forensics and incident response (DFIR) are closely related but distinct disciplines. Digital forensics focuses on collecting, preserving, and analyzing digital evidence to investigate and understand cyber incidents. It aims to uncover what happened, how it happened, and who was responsible. Incident response, on the other hand, is the process of identifying, containing, and mitigating the impact of cyber incidents as they occur. While forensics often plays a role in incident response, the primary goal of incident response is to manage and resolve the incident as quickly and effectively as possible to minimize damage.
Digital forensics supports legal investigations by providing reliable and admissible evidence for court use. Forensic experts follow strict protocols to ensure that the digital evidence they collect, such as logs, files, and communications, is preserved in its original state. This evidence can help prove or disprove allegations, identify perpetrators, and support legal proceedings involving cybercrime, intellectual property theft, fraud, and other criminal activities.
Common tools used in digital forensics include EnCase, FTK (Forensic Toolkit), X-Ways Forensics, Autopsy, and Volatility. These tools allow forensic experts to image hard drives, analyze files and logs, recover deleted data, examine memory dumps, and trace network activity. Each tool has specialized features for different aspects of digital forensics, such as file system analysis, memory forensics, and network forensics, making them essential for conducting thorough investigations.
Incident response planning is crucial for organizations because it prepares them to handle and mitigate the impact of cyber incidents effectively. A well-defined incident response plan outlines the roles, responsibilities, and procedures that must be followed during an incident, enabling swift and coordinated actions. This reduces downtime, limits damage, protects sensitive data, and ensures compliance with legal and regulatory requirements. Organizations are more vulnerable to prolonged disruptions, greater financial losses, and reputational damage without a plan.
The key stages of an incident response process typically include preparation, identification, containment, eradication, recovery, and lessons learned. Organizations develop their incident response plans during the preparation stage and train their teams. Identification involves detecting and confirming a security incident. Containment focuses on limiting the spread of the incident, while eradication consists in removing the threat from the environment. Recovery ensures systems are restored to normal operations, and the lessons learned stage involves analyzing the incident to improve future response efforts and prevent recurrence.