To understand the threat and retrieve possible Indicators of Compromise (IoCs) from a phishing email containing a malicious document, a security analyst should install a sandbox to run the malicious payload in a safe environment. Reference: CompTIA Security+ Certification Exam Objectives - 2.5 Given a scenario, analyze potential indicators to determine the type of attack. Study Guide: Chapter 5, page 209.

iptables is a command-line tool that allows an administrator to configure firewall rules for a Linux system. The
-F option flushes or deletes all the existing rules in the selected chain or in all chains if none is given. It can be used to remove the rules that caused the network to be unresponsive and restore the default firewall behavior.

Explanation
A Business Impact Analysis (BIA) is a critical component of a Business Continuity Plan (BCP). It identifies and prioritizes critical business functions and determines the impact of their disruption. References: CompTIA Security+ Study Guide 601, Chapter 10