ET MALWARE Possible Win32/Hupigon ip.txt with a Non-Mozilla UA

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Possible Win32/Hupigon ip.txt with a Non-Mozilla UA";
    flow:established,to_server;
    http.uri;
    content:"/ip.txt"; nocase; endswith; fast_pattern;
    http.header;
    content:!"%E5%A4%A7%E4%BC%97%E7%82%B9%E8%AF%84";
    content:"|3a 20|no-cache|0d 0a|"; endswith;
    http.header_names;
    content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|"; startswith;
    content:"|0d 0a 0d 0a|"; within:17;
    pcre:"/(?:Cache-Control|Pragma)\x0d\x0a\x0d\x0a$/";
    http.user_agent;
    content:!"Mozilla";
    http.host; dotprefix;
    content:!".malwaredomainlist.com";
    reference:md5,4d23395fcbab1dabef9afe6af81df558;
    classtype:trojan-activity;
    sid:2016950; rev:8;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2013_05_31, deployment Perimeter, malware_family Hupigon, confidence Low, signature_severity Major, updated_at 2023_09_29, reviewed_at 2023_09_29;
    target:src_ip;
)