alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg: "BLEEDING-EDGE VIRUS W32/Bagle.dldr Trojan - download attempt"; flow: established; content:"zoo.jpg"; nocase; pcre:"/(GET |GET (http|https)\:\/\/[-0-9a-z.]*)\/zoo\.jpg/i"; reference:url,secunia.com/virus_information/13085/; classtype: misc-activity; sid: 2001638; rev:11; )