Financial Impact and Background Information on Distributed Denial of Service Attacks

March, 2002


In early February 2000, seven top e-commerce websites in the private sector were attacked by distributed denial of service (DDoS) intrusions, resulting in a $10.6 million loss in unrealized revenues from sales and advertising. From our analysis of Securities and Exchange Commission (SEC) filings and Media Metrix data, we estimate that in a reporting quarter, there are 75 high-volume days. We estimate that DDoS attacks cost the e-commerce sites 24 hours worth of high-volume revenues.