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Friday, June 15, 2007
In light of recent ongoing distributed denial of service (DDOS) attacks aimed at Spamhaus and other public domain IP and domain name reputation services, Barracuda Networks, Inc., today announced that such attacks have had no effect on the spam blocking accuracy of the Barracuda Spam Firewall. Utilizing its own Barracuda Reputation analysis combined with 11 other defense layers and the recently announced Predictive Sender Profiling techniques, the Barracuda Spam Firewall protects customers against email-borne threats even as popular public domain reputation services experience service interruptions.
“While Barracuda Networks recommends the use of Spamhaus block lists with the Barracuda Spam Firewall, reputation checks to external providers are performed after the Barracuda Spam Firewall’s own reputation checks, which are kept current through our Energize Updates service,” said Stephen Pao, vice president of product management for Barracuda Networks. “Therefore, the vast majority of SMTP connection attempts that can be blocked through IP reputation lookup are already blocked by the Barracuda Spam Firewall independent of any external providers. Moreover, techniques such as Predictive Sender Profiling block spam messages in the growing number of cases when IP reputation alone cannot be relied upon.”
The attacks, which caused Spamhaus servers to experience outages earlier this week, were launched using variants of the “Storm Worm” and were distributed through zombie computer networks. Barracuda Central, an advanced technology center at Barracuda Networks consisting of highly trained engineers who continuously monitor and block the latest Internet threats, detected all known “Storm Worm” variants early on and quickly deployed new virus definitions to all Barracuda Spam Firewalls, Barracuda Web Filters and Barracuda IM Firewalls in the field through Energize Updates. This ensured that Barracuda Networks’ customers were not swept into the zombie computer networks used to spread the DDOS attacks.