ET EXPLOIT Possible Microsoft Exchange ProxyLogon Activity - OABVirtualDirectory SetObject (CVE-2021-27065)

alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET EXPLOIT Possible Microsoft Exchange ProxyLogon Activity - OABVirtualDirectory SetObject (CVE-2021-27065)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/ecp/";
    content:"/SetObject?";
    content:"schema=OABVirtualDirectory"; fast_pattern;
    http.header;
    content:"msExchLogonMailbox|3a|";
    http.request_body;
    content:"__type";
    content:"Microsoft.Exchange.Management.ControlPanel"; distance:0;
    content:"ExternalUrl"; distance:0;
    reference:url,github.com/praetorian-inc/proxylogon-exploit/blob/main/exploit.py;
    reference:cve,2021-27065;
    classtype:attempted-admin;
    sid:2033754; rev:1;
    metadata:attack_target Server, created_at 2021_08_20, cve CVE_2021_27065, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2021_08_20, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)