ET MALWARE xCaon Embedded Encrypted Command in Webpage

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE xCaon Embedded Encrypted Command in Webpage";
    flow:established,from_server;
    http.stat_code;
    content:"200";
    file.data;
    content:"|3c 21 2d 2d 7c 23|"; fast_pattern;
    content:!"="; distance:0; within:4;
    content:"|23 7c 2d 2d 3e|"; distance:0; within:300;
    classtype:command-and-control;
    sid:2033245; rev:2;
    metadata:created_at 2021_07_05, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_29;
)