The Cyber Security Review | Wednesday, September 27, 2023
The key to effective incident response is preparation and planning. There is time to coordinate an effective response in the aftermath of a breach or attack.
FREMONT, CA: Incident response is a term used to describe how an organization manages a data breach or cyberattack, including how it attempts to manage the repercussions of the attack or breach ("incident"). The ultimate objective is to effectively manage the incident so that recuperation time, costs, and collateral damage, such as brand reputation, are minimal.
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At a minimum, organizations should have an incident response plan in effect. As part of this plan, the company should define what an incident is and provide a clear, outlined procedure to follow. In addition, it is recommended to identify the teams, employees, or leaders responsible for administering the incident response initiative as a whole and executing each action outlined in the incident response plan.
Typically, an organization's computer incident response team (CIRT), a cyber incident response team, handles the incident response. CIRTs typically consist of security and general IT personnel and legal, human resources, and public relations personnel. In addition to technical specialists capable of addressing specific threats, the team should include experts who can advise enterprise executives on the most effective communication following such incidents.
Steps for Effective Incident Response
Preparation: The most crucial phase of incident response is preparation for the inevitable security violation. CIRT's ability to respond to incidents depends on policies, plans, strategies, communication, documentation, members, access controls, tools, and training.
Identification: Identification is the process by which incidents are detected, preferably promptly, to facilitate rapid response and reduce costs and damages. The next step of effective incident response involves collecting logs, monitoring tools, error messages, intrusion detection systems, and firewalls.
Containment: Once an incident has been detected or identified, its containment becomes a top priority. The primary objective of containment is to contain the damage and prevent further damage. It is essential to note that all of the SANS-recommended steps should be taken during the containment phase, particularly to "prevent the destruction of any evidence that may be needed for later prosecution." Among these measures are short-term containment, system backup, and long-term containment.
Eradication: As part of incident response, eradication involves removing the threat from affected systems and restoring them to their previous state, preferably with minimal damage to the data. The primary actions associated with eradication are assuring that the proper steps have been taken up to this point, including measures that remove the malicious content and ensure that the affected systems are completely pure.
Recovery: Testing, monitoring, and validating systems while returning them to production to ensure that they have not been reinfected or compromised are the primary responsibilities of this phase of incident response. This phase also includes determining the time and date to restore operations, testing and validating compromised systems, monitoring for anomalous behavior, and utilizing testing, monitoring, and validating system behavior tools.
Lessons Learned: The lessons learned phase of incident response is crucial because it educates and improves future incident response efforts. This step allows organizations to update their incident response plans with any information that may have been overlooked during the incident and complete documentation to provide information for future incidents. Lessons learned reports provide a comprehensive summary of the incident and may be utilized during debrief meetings, as training materials for new CIRT members, or as comparison standards.
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