Hellhound (2020)

Hellhound is an anti-personnel program that combines the worst aspects of Pit Bull and Flatline. It locates the intruder and sends oust a modulated pulse designed to cause a heart attack in humans (2D10 wound damage). If the Netrunner escapes in time, it remains active within the Net, lurking silently in a major or long distance terminal, waiting for the specific brain wave pattern of the intruder to show up. It then tracks him down again and kills him. Patient and remorseless, Hellhound can wait years for its victim to log on. Its rarity and high price tag prohibits its use against all, but extremely high-level Netrunners.

Source

 * Cyberpunk 2020, pg.142, 140