ET MALWARE Win32/Colibri Loader Activity M2

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Colibri Loader Activity M2";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php?type=ping&uid="; fast_pattern;
    pcre:"/^[0-9A-F]{16,32}$/R";
    http.user_agent;
    content:!"Mozilla";
    content:!"Safari";
    content:!"Opera";
    pcre:"/^[A-Za-z0-9]{16,32}$/";
    http.content_len;
    byte_test:0,=,0,0,string,dec;
    http.header_names;
    content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Content-Length|0d 0a|"; startswith;
    content:!"Referer";
    reference:md5,a56fea310f3cf5e724ee4a9990047b78;
    reference:url,twitter.com/3xp0rtblog/status/1489245446883069954;
    classtype:command-and-control;
    sid:2035107; rev:1;
    metadata:created_at 2022_02_05, malware_family Win32_Colibri, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_02_05;
)