ET RETIRED ISMAgent CnC Checkin 1

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET RETIRED ISMAgent CnC Checkin 1";
    flow:to_server,established;
    http.method;
    content:"GET";
    http.uri;
    content:"/action2/"; fast_pattern;
    http.user_agent;
    content:"Firefox"; bsize:7;
    http.header_names;
    content:!"Referer|0d 0a|";
    content:!"Accept";
    reference:md5,a70a08a1e17b820c7dc8ee1247d6bfa2;
    reference:url,researchcenter.paloaltonetworks.com/2017/07/unit42-oilrig-uses-ismdoor-variant-possibly-linked-greenbug-threat-group/;
    classtype:command-and-control;
    sid:2024502; rev:5;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_07_28, deployment Perimeter, former_category MALWARE, malware_family Ismdoor, performance_impact Moderate, signature_severity Major, updated_at 2024_09_16, reviewed_at 2024_09_16;
)