alert http $EXTERNAL_NET any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT NextGen Mirth Connect <4.4.1 RCE Attempt (CVE-2023-43208)"; flow:established,to_server; urilen:10; http.method; content:"POST"; http.uri; content:"/api/users"; http.content_type; content:"application/xml"; nocase; http.request_body; content:"|20 20 3c|string|3e|"; startswith; content:"|3c|iMethodName|3e|getMethod|3c 2f|iMethodName|3e|"; content:"|3c|string|3e|getRuntime|3c 2f|string|3e|"; content:"|3c|iMethodName|3e|invoke|3c 2f|iMethodName|3e 0d 0a|"; fast_pattern; reference:cve,2023-43208; reference:url,horizon3.ai/attack-research/attack-blogs/writeup-for-cve-2023-43208-nextgen-mirth-connect-pre-auth-rce/; classtype:attempted-admin; sid:2053410; rev:1; metadata:attack_target Server, created_at 2024_06_10, cve CVE_2023_43208, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2024_06_10, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)