B. Weaponization
The cyber kill chain is a framework that describes the different stages of a cyber attack. The stages of the kill chain are as follows:
Reconnaissance
Weaponization
Delivery
Exploitation
Installation
Command and Control
Actions on Objectives
In this scenario, the penetration tester has already completed the first stage of reconnaissance by harvesting the employees' email addresses from public sources. They are now in the second stage of weaponization, where they are creating a client-side backdoor and attaching it to an email in order to deliver it to the employees.
The next stages of the kill chain would be delivery, where the email is sent to the employees, followed by exploitation, installation, and command and control, where the attacker gains access to the target system and establishes a channel for ongoing communication.