CompTIA Security+ Exam Prep

Answer: D - The standard difference between a worm and a Trojan is that worms easily replicate, whereas Trojans don’t. A Trojan horse is anything that sneaks in under the guise of something else.

A Trojan horse may not be a virus, but may still carry a virus with it. A Trojan will typically enter your system by disguising itself as a friendly program until executed. Unlike viruses and worms, Trojans cannot replicate themselves and must be spread through the exchange of the programs to which they are attached. They attack computers rather than networks, and have been known to delete files to creating backdoors, points of easy access which allows hackers to access the files on your computer remotely.