ET MALWARE Possible GIFTEDVISITOR Activity - Ivanti Connect Secure

alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET MALWARE Possible GIFTEDVISITOR Activity - Ivanti Connect Secure";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/api/v1/cav/client/visits"; fast_pattern;
    http.request_body;
    content:!"GIF8"; startswith;
    content:"GIF"; startswith;
    pcre:"/^(?:[A-Z0-9+/]{4})*(?:[A-Z0-9+/]{2}==|[A-Z0-9+/]{3}=|[A-Z0-9+/]{4})(?:\r\n)?$/R";
    reference:url,www.volexity.com/blog/2024/01/10/active-exploitation-of-two-zero-day-vulnerabilities-in-ivanti-connect-secure-vpn/;
    classtype:command-and-control;
    sid:2050000; rev:2;
    metadata:affected_product Python, attack_target Client_and_Server, created_at 2024_01_11, deployment Perimeter, confidence Low, signature_severity Major, tag RAT, tag UTA0178, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_01_18;
)