Malicious Activity Originating from Fortune 100 Companies

Between January 1 and June 30, 2007, 4% of malicious activity detected originated from the IP address space of Fortune 100 companies. The IP space of Fortune 100 organizations constitutes just over 7% of the world's active and advertised IP space. Since the proportion of malicious activity originating from Fortune 100 IP space is lower than the proportion of the world's active and advertised IP space that is assigned to these organizations, less attack activity is originating from Fortune 100 companies than other IP spaces. It is likely that security measures put in place on Fortune 100 networks make it difficult for attackers to compromise them, or to use them to launch attack activity.

Source: Security Internet Security Threat Report, Vol. XII