alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT ysoserial Payload in HTTP Header (JBossInterceptors1) M3"; flow:established,to_server; http.header; content:"//rwAxgMAAAUAcwByAAAANABvAHIAZwAuAGoAYgBvAHMAcwAuAGkAbgB0AGUAcgBjAGUAcAB0AG8AcgAuAHAAcgBvAHgAeQA"; fast_pattern; classtype:attempted-admin; sid:2033535; rev:1; metadata:attack_target Server, created_at 2021_07_28, deployment Perimeter, deployment Internal, malware_family ysoserial, confidence High, signature_severity Major, tag Exploit, tag possible_exploitation, updated_at 2021_07_28, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)