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A polymorphic engine (sometimes called mutation engine or mutating engine) is a software component that uses polymorphic code to alter the payload while preserving the same functionality. Polymorphic engines are used almost exclusively in malware , with the purpose of being harder for antivirus software to detect.
The first known polymorphic virus was written by Mark Washburn. The virus, called 1260, was written in 1990. A better-known polymorphic virus was created in 1992 by the hacker Dark Avenger as a means of avoiding pattern recognition from antivirus software. A common and very virulent polymorphic virus is the file infecter Virut.
Metamorphic code is used by some viruses when they are about to infect new files, and the result is that the next generation will never look like current generation. The mutated code will do exactly the same thing (under the interpretation used), but the child's binary representation will typically be completely different from the parent's.
This is a list of free and open-source software packages , computer software licensed under free software licenses and open-source licenses. Software that fits the Free Software Definition may be more appropriately called free software ; the GNU project in particular objects to their works being referred to as open-source . [ 1 ]
Source code of an early version released by Electronic Arts in 2015. [14] Duke Nukem 3D: 3D Realms: 1996 2003 Yes No No GPL-2.0-or-later: Game code only, no data, no engine. Doom: id Software: 1993 1997 Yes No No id software license [15] /later GPLv2+ Code only. Originally released under a restrictive license in 1997, in 1999 re-licensed under ...
They are commonly used by hackers to insert other programs such as Trojan horses into otherwise harmless files, making them more difficult to detect. Malware builders (such as keyloggers or stealers) often include a binder by default. [1] A polymorphic packer is a file binder with a polymorphic engine.
A software engine is a core component of a complex software system. The word "engine" is a metaphor of a car's engine. Thus a software engine is a complex subsystem. There is no formal guideline for what should be called an engine, but the term has become widespread in the software industry. [1] [2] [3]
Multiple dispatch or multimethods is a feature of some programming languages in which a function or method can be dynamically dispatched based on the run-time (dynamic) type or, in the more general case, some other attribute of more than one of its arguments. [1]