alert tls $EXTERNAL_NET [!5222,!7687] -> $HOME_NET any (msg:"ET MALWARE Generic AsyncRAT/zgRAT Style SSL Cert"; flow:established,to_client; content:!"infinitecampus.com"; content:"|0f 39 39 39 39 31 32 33 31 32 33 35 39 35 39 5a|"; fast_pattern; content:"|55 04 03|"; pcre:"/^.(?P<servercert>[\x00-\xff][\x20-\x7f]{1,50})\x30.+?\x55\x04\x03.(?P=servercert)\x30/Rsi"; tls.cert_subject; content:"CN="; startswith; content:!"O="; content:!"OU="; content:!"ST="; tls.cert_issuer; content:"CN="; startswith; content:!"O="; content:!"OU="; content:!"ST="; content:!".com"; content:!"CN=localhost"; content:!"CN=ForFunLabs"; reference:md5,7ed7bf7ea7a1551218f73774d28be76c; classtype:domain-c2; sid:2035595; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2021_09_13, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_01, reviewed_at 2024_05_06; target:src_ip;)