Allison Rhodes (OpenDNS team):
OpenDNS — security and DNS provider of choice for 2% of all Internet users — is blocking the Flashback Trojan, or what’s being described as one of the single biggest Mac security incidents of all time. As OpenDNS does in cases of very large scale attacks like this, the protection is included in Premium DNS and completely free to users. People not yet using OpenDNS need only to set up the service on their wireless router, computer or device to secure their computers and devices from the attack. (OpenDNS also offers OpenDNS Enterprise, a security service for businesses that includes comprehensive malware and botnet protection.)
If you’re already using OpenDNS services, no action is required to get the protection. It was enabled for you automatically. In addition to protection from Flashback, OpenDNS will also protect you from future, widespread attacks and make your Internet both faster and more reliable.