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Polymorphic code. In computing, polymorphic code is code that uses a polymorphic engine to mutate while keeping the original algorithm intact - that is, the code changes itself every time it runs, but the function of the code (its semantics) stays the same. For example, the simple math expressions 3+1 and 6-2 both achieve the same result, yet ...
Polymorphic code was the first technique that posed a serious threat to virus scanners. Just like regular encrypted viruses, a polymorphic virus infects files with an encrypted copy of itself, which is decoded by a decryption module. In the case of polymorphic viruses, however, this decryption module is also modified on each infection.
Polymorphic engine. 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.
Given the unique nature of the virus, its origin is uncertain. Whale: DOS Polymorphic 1990-07-01 Hamburg: R Homer At 9216 bytes, was for its time the largest virus ever discovered. ZMist: ZMistfall, Zombie.Mistfall Windows 2001 Russia: Z0mbie It was the first virus to use a technique known as "code integration". Xafecopy: Android Trojan 2017 Zuc
Metamorphic code is used by computer viruses to avoid the pattern recognition of anti-virus software.Metamorphic viruses often translate their own binary code into a temporary representation, editing the temporary representation of themselves and then translate the edited form back to machine code again. [1]
August 24: Source code for MegaPanzer is released by its author under GPLv3. [56] and appears to have been apparently detected in the wild. [57] November 27: The virus Kenzero is a virus that spreads online from peer-to-peer networks (P2P) taking browsing history. [58]
1260, or V2PX, [ 1][ 2] was a polymorphic computer virus written in 1989 by Mark Washburn. Derived from Ralf Burger's publication of the disassembled Vienna Virus source code, the 1260 added a cipher and varied its signature by randomizing its decryption algorithm. Both the 1260 and Vienna infect .COM files in the current or PATH directories ...
Some new viruses, particularly ransomware, use polymorphic code to avoid detection by virus scanners. Jerome Segura, a security analyst with ParetoLogic, explained: [ 145 ] It's something that they miss a lot of the time because this type of [ransomware virus] comes from sites that use a polymorphism, which means they basically randomize the ...