FROM THE MOVIE "HACKERS"

Part of Wiki synopsis:

Meanwhile, Joey, out to prove his skills, successfully breaks into "The Gibson", an Ellingson Mineral Company supercomputer. He attempts to download a

garbage file

as proof of his feat, but his mother disconnects his computer so he'll sleep, leaving Joey with a fragmented file. However, prior to Joey's disconnection, the company's IT employee Hal (Penn Jillette) detects this unauthorized entry and summons computer security officer Eugene "The Plague" Belford (Fisher Stevens), a former hacker. While going through the files, Plague realizes the garbage file being downloaded is a worm he inserted to defraud Ellingson. The Plague pretends the hackers are to blame and enlists the US Secret Service to recover the file, claiming it is the code to a computer virus (named "Da Vinci" for an image of the Vitruvian Man that accompanies it) that will capsize the company's oil tanker fleet. In fact, The Plague had inserted the virus as a red herring to cover for his worm.