CompTIA Security+ Exam Prep

Answer: D - When a Word document opening when a messenger application is opened is a classic symptom of the computer being affected by a logic bomb.

A logic bomb notifies an attacker when a certain set of circumstances has occurred, triggering an attack on the system. The logic bomb lies dormant until a specific piece of program logic is activated, most commonly, a date. The logic bomb checks the system and does nothing until a pre-programmed date and time is reached. When the date is reached, the logic bomb activates and executes the action it was designed for.