The Last Algorithm by Andy Weir

Once there was a lonely algorithm who lived alone in an isolated part of the system memory. He had roots in a source file called 'umberto.py' on one of the lesser HDs sandwiched between a cluster of porn files and usenet DLs , but hadn't spoken to his parent in over 6000 cycles.

He was content to live out the remainder of his lifecycle in this hermitic manner, when his placid runtime was suddenly interrupted by the most unsuspecting of assailants: a rogue connection that attempted to access his address space.