In computing what is the name of a non-self-replicating type of malware program containing malicious code that
appears to have some useful purpose but also contains code that has a malicious or harmful purpose
imbedded in it, when executed, carries out actions that are unknown to the person installing it, typically causing
loss or theft of data, and possible system harm.

A.
virus

B.
worm

C.
Trojan horse

D.
trapdoor

Explanation:
A trojan horse is any code that appears to have some useful purpose but contains code that has a malicious or
harmful purpose imbedded in it. It is non-self-replicating malware that often includes a trapdoor as a means to
gain access to a computer system bypassing security controls.
Incorrect Answers:
A: A Virus is a malicious program that can replicate itself and spread from one system to another. It does not
appear to be harmless; its sole purpose is malicious intent often doing damage to a system.
B: A Worm is similar to a Virus but does not require user intervention to execute. Rather than doing damage to
the system, worms tend to self-propagate and devour the resources of a system.
D A trapdoor is a means to bypass security by hiding an entry point into a system. Trojan Horses often have a
trapdoor imbedded in them.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, pp. 1213, 1214
http://en.wikipedia.org/wiki/Trojan_horse_(computing)
http://en.wikipedia.org/wiki/Computer_virus
http://en.wikipedia.org/wiki/Computer_worm
http://en.wikipedia.org/wiki/Backdoor_(computing)