alert tls $EXTERNAL_NET [443,4443] -> $HOME_NET any (msg:"ET MALWARE Possible Dyre SSL Cert (fake state)"; flow:established,to_client; tls.cert_serial; content:"00:"; startswith; bsize:26; tls.cert_subject; content:"C=AU"; fast_pattern; content:!"ST=Some-State"; tls.certs; content:"|02 09 00|"; distance:8; within:3; content:"|06 03 55 04 06 13 02 41 55|"; distance:0; content:"|06 03 55 04 08|"; distance:0; pcre:"/^.{2}(?=[A-Z]{0,32}[^A-Z01])(?P<var>[^01]{4,33}[01]).+?\x06\x03\x55\x04\x08.{2}(?P=var)/Rs"; classtype:trojan-activity; sid:2019833; rev:11; metadata:attack_target Client_Endpoint, created_at 2014_12_02, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2022_06_27, reviewed_at 2024_03_25;)