Answer:
Logic bomb
Step-by-step explanation:
A logic bomb is a malware which contains pieces of code that are intended to perform malicious action in an operating system, a computer software and/or other applications. One important thing about logic bombs is that they are driven or triggered by events or when certain conditions are met. In other words, until they are triggered, they remain dormant in the target application. They can be triggered or activated by events such as;
i. change in a particular file
ii. changing of file/folder permission or access control
iii. typing a specific combination of key strokes
iv. specific date and/or time.
Logic bombs are most times concealed by or in Trojan Horses and can cause certain problems such as;
i. file deletion
ii. hard drive erasure