alert tls $EXTERNAL_NET 1025 -> $HOME_NET any (msg:"ET MALWARE Possible Mailer Dropped by Dyre SSL Cert"; flow:established,to_client; tls.certs; content:"|06 03 55 04 06 13 02 41 55|"; fast_pattern; content:"|55 04 08|"; distance:0; pcre:"/^.{2}(?P<var>[a-z0-9]{4,16}[01]).+?\x06\x03\x55\x04\x08.{2}(?P=var)/Rs"; reference:md5,dbcdaf617e19d2a35f763ac996cf8cd7; classtype:trojan-activity; sid:2020205; rev:5; metadata:attack_target Client_Endpoint, created_at 2015_01_19, deployment Perimeter, confidence Medium, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2024_04_03;)