Amalicious actor has contacted multiple individuals at a company over multiple months in order to convince unsuspecting users to execute a malicious file on their systems. by doing so, the actor could covertly gain control of those systems and establish a presence inside the network. which type of malware was the actor attempting to have the users execute?

Trojan horse

Explanation:

The malicious actor was trying to con users into executing the Trojan horse virus. The Trojan horse is a deceptive virus that acts as an "innocent" application. Although this virus do not have the ability to replicate themselves, they are however very destructive. Trojan horse can help perpetrators gain a presence inside a network and further introduce virus into the network.

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an expression designed to call something to mind without mentioning it explicitly; an indirect or passing reference.