ET EXPLOIT ManageEngine AdSelfService Plus - .jsp WebShell Upload Attempt (CVE-2021-40539)

alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET EXPLOIT ManageEngine AdSelfService Plus - .jsp WebShell Upload Attempt (CVE-2021-40539)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/RestAPI/";
    http.request_body;
    content:"form-data|3b 20|name=|22|methodToCall|22|"; fast_pattern;
    content:"unspecified"; distance:0; within:30;
    content:"|20|name=|22|Save|22|";
    content:"filename=|22|";
    pcre:"/^[^\x22]+\.jsp\x22/R";
    reference:url,www.synacktiv.com/publications/how-to-exploit-cve-2021-40539-on-manageengine-adselfservice-plus.html;
    reference:cve,2021-40539;
    classtype:attempted-admin;
    sid:2034364; rev:1;
    metadata:attack_target Server, created_at 2021_11_09, cve CVE_2021_40539, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2021_11_09, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)