[Introduction to Incident Handling and Response] Robert is an incident handler working for Xsecurity Inc. One day, his organization faced a massive…

The action performed by Robert, which is restoring the web application service using existing backups, directly corresponds to the Recovery phase of the Incident Handling and Response (IH&R) process. This phase focuses on restoring systems to normal operation after a security incident has been contained and eradicated. The primary goal of recovery is to bring affected systems back online, validate their functionality, and resume business operations, thereby ensuring business continuity. Restoring from a known-good backup is a fundamental recovery task.

A. Evidence gathering and forensics analysis: This stage involves collecting and analyzing data to understand the incident's scope and cause. Robert's action is restorative, not investigative.
B. Eradication: This stage focuses on eliminating the root cause of the incident, such as removing malware or patching vulnerabilities, which typically precedes the recovery of services.
C. Notification: This involves communicating the incident to relevant stakeholders, such as management, legal teams, or customers. It is a procedural step, not a technical restoration activity.

1. NIST Special Publication 800-61 Rev. 2

"Computer Security Incident Handling Guide":

Section 3.4.2

Recovery (Page 33): This section explicitly defines the recovery phase. It states

"In the recovery phase

administrators restore systems to normal operation

confirm that the systems are functioning normally

and (if applicable) remediate vulnerabilities to prevent similar incidents." It further mentions that this may involve "restoring systems from clean backups." Robert's action is a direct implementation of this principle.

2. Carnegie Mellon University

Software Engineering Institute

"CSIRT Services":

Incident Handling Service (Page 4): In the description of the incident handling lifecycle (which mirrors the NIST model)

the "Recovery" step is described as the process of "restoring the affected systems

services

resources

and data to a normal

trusted operational state." This aligns perfectly with restoring a web application from backups.

3. SANS Institute

"The Incident Handler's Handbook":

Section: The Six Steps (Page 5): The SANS/NIST model outlines six steps. Step 5

"Eradication & Recovery

" is a combined phase. The recovery component is defined as the process of restoring data from backups and returning systems to a production state after the threat has been removed. Robert's action is the recovery part of this step.