ET MALWARE Generic AsyncRAT/zgRAT Style SSL Cert

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;
)