alert tls $EXTERNAL_NET 443 -> $HOME_NET any (msg:"ET HUNTING Self-Signed Cert O=XX Observed"; flow:established,to_client; tls.cert_subject; content:"O=XX"; fast_pattern; tls.cert_issuer; content:"O=XX"; reference:md5,00e7afce84c84cd70fe329d8bb8c0731; classtype:trojan-activity; sid:2018284; rev:5; metadata:attack_target Client_Endpoint, created_at 2014_03_17, deployment Perimeter, confidence Medium, signature_severity Minor, updated_at 2022_06_28, reviewed_at 2024_04_23;)