alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Zemot URI Struct"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/catalog/"; fast_pattern; pcre:"/\/catalog\/\d{3,}$/"; http.header; content:!"nap.edu|0d 0a|"; http.header_names; content:!"Accept-"; content:!"Referer|0d 0a|"; reference:md5,b8e0b97c8e9faa6e5daa8f0cac845516; classtype:trojan-activity; sid:2019458; rev:5; metadata:created_at 2014_10_17, malware_family Win32_Zemot, signature_severity Major, updated_at 2020_10_07;)