Pushdo and CutWail - Iptables + Nginx + Naxsi
Firewall - Server ( Iptables ) - Nginx + Naxsi Analysis of Impact to High Load CPU - with spam and there is the largest botnet in terms of the amount of infected hosts. Im put this article where is ive got million parameter POST 67.248.43.182 - - [25/Mar/2013:23:23:31 +0700] "POST /?ptrxcz_EEEFFFFFFFFFFGGGGGGGGGGHHHHHHH HTTP/1.1" 404 564 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 190.25.79.166 - - [25/Mar/2013:23:23:31 +0700] "POST / HTTP/1.1" 302 5 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 190.118.16.50 - - [25/Mar/2013:23:23:31 +0700] "POST /?ptrxcz_effffffffgggggggghhhhhhhhhiiii HTTP/1.1" 404 564 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)" 189.164.7.205 - - [25/Mar/2013:23:23:31 +0700] "POST /?ptrxcz_tx147AEHLORVYbehkosvz259CFJNQT HTTP/1.1" 404 564 "-" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV