alert tcp any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT Possible Apache log4j RCE Attempt (tcp nds) (CVE-2021-44228)"; flow:established,to_server; content:"|24 7b|jndi|3a|nds|3a|"; fast_pattern; reference:cve,2021-44228; classtype:attempted-admin; sid:2034712; rev:1; metadata:attack_target Server, created_at 2021_12_14, cve CVE_2021_44228, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2021_12_14, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)