As Matthew Jonkman comments   in  the emerging-sigs mailing list,  Emerging Threats is under a DDoS attack since  November 1st, but the rule distributions is not being affected.

Still taking a DDoS, but we have a good idea who it is. For the time being do NOT visit is fine, but will be down for a while yet likely. 

Rules are unaffected, make sure you’re downloading from 

Thanks for everyone’s support. We’re doing something right if they’re spending time on us. Rally the troops! Keep up the fight!