alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE f0xy Download"; flow:to_server,established; http.uri; content:"/bn_versions/"; fast_pattern; content:".exe"; pcre:"/\/bn_versions\/\d+?\.exe$/"; http.header_names; content:!"Referer|0d 0a|"; reference:md5,160634d784c256d29563117554685c31; reference:url,community.websense.com/blogs/securitylabs/archive/2015/01/29/new-f0xy-malware-employs-cunning-stealth-amp-trickery.aspx; classtype:trojan-activity; sid:2020341; rev:6; metadata:created_at 2015_01_30, signature_severity Major, updated_at 2020_09_29;)