alert http $EXTERNAL_NET any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT Atlassian Confluence RCE Attempt Observed (CVE-2023-22527) M1"; 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:2050340; rev:1; metadata:affected_product Atlassian_Confluence, attack_target Server, created_at 2024_01_23, cve CVE_2023_22527, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2024_01_23, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)