How does a 'logic bomb' work?
A logic bomb, also called slag code because all that's left after it detonates is computer slag, is not the same thing as a virus, although it often behaves in a similar manner. It is a piece of computer code that executes a malicious task, such as clearing a hard drive or deleting specific files, when it is triggered by a specific event. It's secretly inserted into the code of a computer's existing software, where it lies dormant until that event occurs.
This event might be a positive trigger, such as a specific date and time or the removal of an employee's name from the salary database; or it might be a negative trigger, such as a particular employee failing to input a command by a certain time -- meaning he or she is probably not at the company anymore. Howstuffworks "How does a 'logic bomb' work?"
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