What is the final step in the Threat Hunting Process?

The threat hunting process is a proactive and iterative cycle designed to uncover hidden threats within a network. The process typically begins with Hypothesis Generation (C), where an assumption is made about a potential threat. This is followed by Data Acquisition (A) to collect relevant logs and telemetry, and then Data Analysis (B) to search for patterns or anomalies that support the hypothesis. The final step in a single hunting iteration is Investigation and Validation (D). In this phase, the security analyst deeply investigates any suspicious findings from the analysis to confirm if they represent a genuine threat (a true positive), understand the scope of the compromise, and validate the initial hypothesis. This confirmation concludes the hunt and often triggers the incident response process.

A. Data Acquisition: This is a foundational, early-stage step where data is collected to test a hypothesis, not the concluding action.
B. Data Analysis: This is the core middle phase of sifting through collected data, which occurs before the final validation of findings.
C. Hypothesis Generation: This is the starting point of any threat hunt, where the objective and scope of the hunt are defined.

1. Cisco, "Threat Hunting for the Modern SOC" White Paper. This document outlines the threat hunting loop, which concludes with the "Uncover new patterns and TTPs" and "Inform and enrich automated detection" stages. These actions are the direct result of the investigation and validation phase, where findings are confirmed and operationalized. The process is described as cyclical, starting with a hypothesis and ending with informing security controls. (Reference: Cisco White Paper, "Threat Hunting for the Modern SOC," published by Cisco Systems, Inc., 2019, Section: "The Threat Hunting Loop," Page 4).

2. Cisco, "A Practical Guide to Threat Hunting" by Martin N. Lee and Ben Baker. This guide details a structured hunting process. It describes the final stages as "Uncovering the pattern" and "Enriching the data," which involve confirming the malicious activity and gathering sufficient evidence to validate the threat. This aligns directly with the concept of investigation and validation. (Reference: Cisco White Paper, "A Practical Guide to Threat Hunting," 2016, Section: "The Hunt," Pages 4-5).

3. Carnegie Mellon University, Software Engineering Institute (SEI), "The Threat Hunting Handbook." While not a Cisco document, SEI is a highly reputable source often referenced in cybersecurity curricula. The handbook describes the final step of the hunting process as "Respond," which is predicated on the successful investigation and validation of a threat. The validation step is what confirms a hunt's findings and determines the need for a response. (Reference: CMU SEI, "The Threat Hunting Handbook," 2022, Section 3.4: "The Hunting Process," Page 12).