Question

during which stage of a cyber attack is malicious software set up on the target system?
exploitation
installation

Explanation:

In the cyber attack kill chain (or stages of a cyber attack), after exploitation (where vulnerabilities are leveraged to gain access), the next stage often involves installing malicious software on the target system. The "Installation" stage is when the attacker deploys the malicious payload (like malware) onto the compromised system to maintain access or carry out further malicious actions. Exploitation is about gaining access by exploiting a vulnerability, while installation is about putting the malicious software in place on the target system. So the stage where malicious software is set up on the target system is Installation.

Answer:

Installation