3. ILOVEYOU – $15 Billion
ILOVEYOU might be developed in Manila, it spread to Hong Kong and then the rest of the world. 50 millions infections were reported in just ten days and most of the damages caused were time, effort and money spent to get rid of the infection and restore critical files from backups. ILOVEYOU script runs in Microsoft Outlook and written using VBS (Visual Basic Scripting)