Sapphire Worm Global Infection Map (2003) | Cybersecurity Historical Data #1478759 (License: Personal Use)

This visualization documents the rapid global propagation of the Sapphire (SQL Slammer) worm within hours of its release in January 2003, infecting over 74,000 hosts. The map uses proportional blue circles to indicate regional infection intensity, revealing hotspots in North America, Europe, and parts of Asia. Data was collected by UC Regents and visualized via VisualRoute.

Used in cybersecurity retrospectives, academic papers, and threat intelligence reports to illustrate early internet worm behavior and the speed of modern malware spread; matches user intent for historical cyberattack analysis or educational reference.