ET HUNTING Microsoft Sharepoint Server Insecure Deserialization via Scorecard DataSet Gadget

alert http any any -> $HOME_NET any (
    msg:"ET HUNTING Microsoft Sharepoint Server Insecure Deserialization via Scorecard DataSet Gadget";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.request_body;
    content:"microsoft.performancepoint.scorecards"; fast_pattern; nocase;
    content:"exceldataset"; nocase;
    content:"compresseddatatable"; nocase;
    pcre:"/^(?:\x3d|\x253[dD]|\x26equals\x3b)(?:\x22|\x2522|\x26quot\x3b)H4sIAAAA/R";
    reference:url,research.eye.security/sharepoint-under-siege/;
    classtype:web-application-attack;
    sid:2063684; rev:1;
    metadata:affected_product Microsoft_Sharepoint, attack_target Server, tls_state TLSDecrypt, created_at 2025_07_23, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, updated_at 2025_07_23, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)