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You may be looking for the novel 24 Declassified: Trojan Horse.

A Trojan Horse was a type of computer program that appeared to be an innocent download, however contained malicious code to perform unwanted actions on their system.

Nikolai Manos had Richard Lesser design a Trojan Horse virus disguised in a download of an unreleased movie, Gates of Heaven. It was installed onto Hugh Vetri's computer. (Trojan Horse)

On the 22nd of January before Day 2, Marie Warner installed the "Trojan Horse Passwordz" program onto Reza Naiyeer's laptop while he was in Europe. This gave her backdoor access to Warner Enterprises' computer systems, allowing her to enter a shipping order for the "Syed Group". ("Day 2: 5:00pm-6:00pm")