alert http $EXTERNAL_NET any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT Atlassian Confluence RCE Attempt Observed (CVE-2023-22527) M2"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".vm"; endswith; http.request_body; content:".KEY_velocity.struts2"; fast_pattern; content:"%7b"; distance:0; content:"%7d"; distance:0; reference:cve,2023-22527; classtype:attempted-admin; sid:2050543; rev:2; metadata:affected_product Atlassian_Confluence, attack_target Server, created_at 2024_01_29, cve CVE_2023_22527, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2024_11_22, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)