CompTIA Security+ Exam Prep

Answer: D - This is a classic symptom of the computer being affected by a worm.

A worm attempts to replicate using whatever means are available. It is not mandatory that the worm resides on a system. The worm may have been in a system with the user’s name in the address book. Perform a thorough scan to remove the worm. Most often, automatic e-mailing of contacts is caused by a worm.