alert tcp any any -> $HOME_NET any (msg:"ET EXPLOIT Fortinet FortiSIEM phMonitor Unauthenticated Argument Injection (CVE-2025-64155)"; flow:established,to_server; content:"|9c 00 00 00|"; startswith; content:"|6f 42 1e 40 00 00 00 00|"; distance:4; within:8; content:"|3c|client_type|3e|javaTransportClient"; fast_pattern; content:"|3c|cluster_url|3e|"; pcre:"/^[^\x3c]*?\x20\x2d{1,2}\w+/R"; reference:url,horizon3.ai/attack-research/disclosures/cve-2025-64155-three-years-of-remotely-rooting-the-fortinet-fortisiem/; reference:cve,2025-64155; classtype:attempted-user; sid:2066746; rev:1; metadata:affected_product FortiSIEM, attack_target Server, tls_state TLSDecrypt, created_at 2026_01_14, cve CVE_2025_64155, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_01_14, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)