alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET EXPLOIT MS04-032 Bad EMF file"; flow:from_server,established; content:"|01 00 00 00|"; depth:4; content:"|20 45 4d 46|"; offset:40; depth:44; byte_test:4, >, 256, 60, little; reference:url,www.sygate.com/alerts/SSR20041013-0001.htm; classtype:misc-activity; sid:2001374; rev:8; metadata:created_at 2010_07_30, confidence Medium, signature_severity Major, updated_at 2019_07_26;)