Which of the following virus types changes some of its characteristics as it spreads?

A.
Boot Sector

B.
Parasitic

C.
Stealth

D.
Polymorphic

Explanation:
A Polymorphic virus produces varied but operational copies of itself in an attempt to evade anti-virus software.
Incorrect Answers:
A: A boot sector virus attacks the boot sector of a drive. It describes the type of attack of the virus and not the
characteristics of its composition.
B: A parasitic virus attaches itself to other files but does not change its characteristics.
C: A stealth virus attempts to hide changes of the affected files but not itself.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, pp. 1199, 1200, 1201