logic bomb 
noun Computing
A set of instructions secretly incorporated into a program so that if a particular condition is satisfied they will be carried out, usually with harmful effects.That can mean stealing information, destroying files, or virtually shutting down an entire company through the use of a Trojan horse or logic bomb....
- In addition, in cases where a virus contains a time or logic bomb, sandboxing is rarely successful.
- Worm attacks, domain-name high-jacking, logic bombs, mail bombs and Trojan horses have all been utilized by hackers, but now denial-of-service attacks are gnawing away at the Internet's soft underbelly.
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