ET EXPLOIT Cisco IOS XE Web Server Implant Check (CVE-2023-20198) M3

alert http $EXTERNAL_NET any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET EXPLOIT Cisco IOS XE Web Server Implant Check (CVE-2023-20198) M3";
    flow:established,to_server;
    urilen:32;
    http.method;
    content:"POST";
    http.uri;
    content:"|2f|webui|2f|logoutconfirm|2e|html|3f|menu|3d|1"; fast_pattern;
    threshold:type limit,seconds 300,count 1,track by_src;
    reference:url,blog.talosintelligence.com/active-exploitation-of-cisco-ios-xe-software/;
    reference:cve,2023-20198;
    classtype:trojan-activity;
    sid:2049103; rev:1;
    metadata:attack_target Networking_Equipment, created_at 2023_11_07, cve CVE_2023_20198, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_07;
)