ET MALWARE [ESET] TA410 APT LookBack HTTP Server Response

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE [ESET] TA410 APT LookBack HTTP Server Response";
    flow:established,to_client;
    http.stat_code;
    content:"200";
    http.content_type;
    content:"image/gif"; bsize:9;
    http.header;
    pcre:"/^ETag\x3a\x20[0-9]{6}-[0-9]{3,5}-[0-9]{8}\r\n/m";
    file.data;
    content:"|c2 2e ab 48|"; depth:4; fast_pattern;
    reference:url,www.welivesecurity.com/2022/04/27/lookback-ta410-umbrella-cyberespionage-ttps-activity/;
    reference:url,github.com/eset/malware-ioc/tree/master/ta410;
    classtype:trojan-activity;
    sid:2036413; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_04_28, deployment Perimeter, malware_family TA410, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_04_28;
)