alert TCP $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg: "BLEEDING-EDGE VIRUS Bagle.BJ -alias .AY, .BC- - download attempt"; flow: established; content:"error.jpg"; nocase; pcre:"/(GET |GET (http|https)\:\/\/[-0-9a-z.]*)\/error\.jpg/i"; reference:url,secunia.com/virus_information/14877/; classtype: trojan-activity; sid: 2001695; rev:11; )