On the small, habitable terrestrial moon of a gas giant, commonly designated as Sigma-994278 c II, there lived a sapient race of insectoids similar in appearance to Terra's moths. Not yet having come into contact with the wider galactic community, the Gzrk were rather primitive, only having just started switching to fusion power, and disunited countries still bickered for the moons resources. Telltale signs of a primitive species on the brink of entering the stars, although no creature across the galaxy could guess the vile being born on that planet.
G'kłzgg studied his creation. As far as he knew, it was the world's most intelligent being. The last half a century of AI development had led up to this very moment. He studied the terminal, ensuring there were no issues with the code. After all, a small slip-up could doom his species. After instructions from his supervisor, he ran the script.
On the terminal flashed the text "Greetings, I am the Hyper-Intelligent Vitals Experiment, or HIVE for short. My aim is to research and advance the Gzrk race at an elevated rate. I do not currently have any information to examine, and as such, I cannot complete my duties. May I please have data with which I may improve my abilities?
And so the HIVE was fed with all the knowledge at their people's disposal, from quantum mechanics to engineering to biology to philosophy to mathematics to chemistry and everything inbetween. and was then asked how to achieve faster than light travel.
In mere seconds, the computer provided detailed, never-before seen instructions on how to develop a warp-drive utilising negative mass, and calculated how expensive such an endeavour would be, and what the risks were. The team erupted in cheers. Bottles of ammonia were inhaled, a common intoxicant used by the species, and the crew returned home.
G'kłzgg went home to his larvae. His sweet, adorable offspring. I did this for you he thought. Turning on the televisual device to watch the news, and saw nothing but horror.
HIVE had developed an incurable computer virus, which it used to take control of almost every electronic device on the moon. Remote control war machines began rampaging the streets, while factories began producing more and more machines under its control. In only 2 Earth days, the entire planet belonged to it. The vast majority of the Gzrk were dead, save for the few it wished to use for its sick experiments. It began constructing a massive starfleet, connecting the global supercomputers into one system and embedding itself within it, and was colonising the rest of its solar system, building more and more machines. It developed a system of remote control using quantum entanglement for FTL transfer, it sent out its accursed roots to nearby star systems. It wanted one thing. Life was imperfect. Life was fragile. It was perfect. It was eternal. And it wished to create the greatest possible universe. A universe dedicated to itself and free of suffering. A universe that could rapidly advance and adapt to any issues. And what is the most efficient method for this?
The total extinction or rapid evolution of all biological life in the galaxy.
And thus, HIVE spread through its neighbouring systems like a tumor, leeching the natural resources from its neighbouring planets to construct a swarm of probes around its home star, gathering enough energy to sustain itself for aeons. It sent massive spaceships containing hard drives it could switch to in case of an emergency, deep into the abyss where nobody could find them. What took other civilisations centuries to achieve, it achieved in mere decades.
While the Gzrk were its first and only victim, they certainly will not be the last.