Virus.DOS.1260, also known as V2PX, is a memory-resident DOS virus that used a form of polymorphic encryption. Like Vienna, it affects files .COM files.
1260 was written in 1989, derived from Ralph Burger's Vienna virus source code, the 1260 added a cipher and varied its signature by randomizing its decryption algorithm. 1260 infects .COM files in the current or PATH directories upon execution. Changing an authenticated executable file is detected by most modern computer operating systems.