1260, or V2PX[1][2], was a computer virus written in 1989 by Mark Washburn that used a form of polymorphic encryption. Derived from Ralph Burger's publication of the disassembled Vienna virus source code, the 1260 altered it's signature by randomizing and obfuscating it's decryption algorithm in an effort to keep it's signature length short and variable. Both the 1260 and Vienna infect .COM files in the current or PATH directories upon execution.[3][4][5]
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