ET MALWARE JsOutProx CnC Activity - Inbound

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE JsOutProx CnC Activity - Inbound";
    flow:established,from_server;
    http.stat_code;
    content:"200";
    http.cookie; bsize:<30;
    content:"5f7c5f"; endswith; fast_pattern;
    http.content_type;
    content:"image/jpeg"; bsize:10;
    threshold:type limit, track by_src, count 1, seconds 30;
    classtype:command-and-control;
    sid:2034290; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_12_10, deployment Perimeter, malware_family jsoutprox, confidence High, signature_severity Major, tag RAT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_12_10;
)