CISA Isaca CISA Training Boot Camp

Demo Question 8.

Answer: D

Explanation: : A polymorphic virus has the capability of changing its own code, enabling it to have many different variants. Since they have no consistent binary pattern, such viruses are hard to identify. Incorrect answers: A. A logic bomb is code that is hidden in a program or system which will cause something to happen when the user performs a certain action or when certain conditions are met. A logic bomb, which can be downloaded along with a corrupted shareware or freeware program, may destroy data, violate system security, or erase the hard drive. B. A stealth virus is a virus that hides itself by intercepting disk access requests. When an antivirus program tries to read files or boot sectors to find the virus, the stealth virus feeds the antivirus program a clean image of the file or boot sector. C. A trojan horse is a virus program that appears to be useful and harmless but which has harmful side effects such as destroying data or breaking the security of the system on which it is run.